Filter Element Simulation Toolbox - Fraunhofer
Contents
1. eee 0000 SFilticS Survey on the case studies coming with FiltEST 18 4 2 The cylindrical filter Figure 4 2 1 The cylindrical filter housing blue with the cylindrical filtering medium white the supporting frame structure dark grey ring shaped inlet red and circular outlet green Recommended coarsest grid resolution voxel length 04mm 333 FIt ES Survey on the case studies coming with FiltEST 19 4 3 The pleated cartridge Figure 4 3 1 The cylindrical housing with side inlet channel blue the pleated cartridge medium white the inlet region red and the central circular outlet at the bottom green Inlet channel length Inlet diameter 25 ca 861 13 cm ca 12 56 cm Outlet area ca 6 16 cm2 Housing fluid volume ca 479 03 cm3 Recommended coarsest grid resolution voxel length OAmm 333 FilticS Survey on the case studies coming with FiltEST 20 4 4 The pleated panel Figure 4 4 1 The cuboid shaped fluid region blue with the pleated panel white the upper inlet region red and the lower outlet region green Fluid volume width x Fluid volume length y Fluid volume height z 60 mm Total fluid volume 105 6 cm3 Inlet outlet area 48 cm Thickness of filtering medium Pleat length 14 mm Pleat count Filtration area ca 169 21 cm2. Save S E Dust Configuration Density kam 3 Da meter m icrons Concentration m I so L E Configure Lookuptables Velocity Range 1 Velocity 0 alue Channel 1 Alpha 1 339 FilticS Working with FiltEST 15 In the section Numerical Settings you can specity e numerical options e start and save options especially for visualization output e parameters for the fine tuning of the hybrid permeability model In the Numerical Options dialog you can set the time Numerical Parameters for Efficienc i interval after which we re compute the flow Efficiency Numerical Parameters If the computed value of the pressure drop exceeds the Terminal pressure Drop the simulations will stop no matter which simulation duration time was selected Recompute Flow Time 5 30 Terminal Pressure Drop mbar 4000 Time stepl s 30 Me BERRIE Time step is the numerical time step used for each particle channel In the Start and Save Config dialog you can specify BE Start And Save Config Efficiency e whether or not to write visualization output mera e after which time simulated output is written EnA kn e which output format is used VTU or VTI Write Visualization File If the visualization flag is enabled the output will be written at least once at the end of the simulations if there is no intermedia
3. Pleat designer Filtration parameter estimator Customized modules for your specific needs Where to Get the Software and Licenses You can find information on our activities concerning modeling and simulation of filtration on the web page www itwm fraunhofer de filtration From there you will find a link to the FiltEST web site with detailed information about obtaining a demo version of the software so Frit ES Introductory remarks 5 1 3 Contact Us If you have any question please contact us per email to filtest itwm fraunhofer de 1 4 About this Document This quick introduction to FiltEST explains some of the most important features of the software It covers the demo version of FiltEST Remark All geometries shown as well as the material and numerical parameters used in the examples are created by Fraunhofer ITWM for the sake of illustration They are only reflective of the real filter element designs and materials 333 FilticS Getting started with FiltEST 6 2 Getting started with FiltEST In this section we describe how the software is installed and how you can obtain a license for it 2 1 Installing FiltEST Note You not need administrator privileges for the installation 2 1 1 Windows 7 and 8 64 bit Double click the FiltEST msi file and follow through the installation steps The default settings should do fine and you can deci
4. V Compute Vorticity A Display GeometryRepresentation Color Fanas Eson J mes Ree E Visible V Interpolate Scalars Before Mapping Opacity LJ 1 Interpolation Gouraud Line Width Backface Representation Figure 6 3 3 Visualization of the streamlines colored with the flow speed e Inthe Properties tab scroll down to the Display section to select the velocity data for the coloring of the streamlines Add a legend and you re done see Figure 6 3 3 The streamlines can be colored using the other data arrays too With this feature you can look at the changes in the pressure the concentration etc along a trajectory We conclude this appendix stating that we presented here a really really tiny part of ParaView s capabilities There are many interesting and useful features we could not touch here in order to keep it short However two useful things in the File menu should be mentioned here e The Save Screenshot function with which you can convert the plots into graphics Tiles e The Save State Load State feature This is very nice if you spend a lot of work on the visualization of the results e g the creation of streamlines You can store the current status of your ParaView session including the application of filters and the sources created etc in a so called state file This state can be reloaded and you can continue the processing at the point wher
5. Filter Element Simulation Toolbox User Manual for the Demo Version March 2013 Oleg lliev Ralf Kirsch and Zahra Lakdawala A Fraunhofer ITWM ss FalticS 1 1 INTRODUCTORY REMARKS 0 ccceccceeee sence eee eeeeeeeneeeeneneesensneeenenees 3 1 1 PDGUC GINGE SL cebaccsecctsceyectteccueccetcaceentecieesecccevierosec E E esc censetensecceect 3 Tee Bees Fe gS Or UNE il scquvnacsvenstaten tte sarscren aac totceiersco tes raea ana ae Eaka ai 3 1 1 2 Additional features of the full version sic cesseancovaielviacssenndevaielcdieancesnassuelsbacnionndsvarebelarsiempiarees 4 1 1 3 Additional Optional Features cic cctcassrcorcwemanedinnenatntneneahininedoaceintwanatsaomgdtinnaiimeneebiduaueinintnaceanndailiens 4 1 2 Where to Get the Software and Licenses ccccceeeseeeseeeeeeeeeeeenaaeseneeeeseeeeaaasneeeeeeeseaaaes 4 1 3 CONTACT US er E E E E 5 1 4 About this Document s ssssnnsssnennnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnnm mennene 5 2 GETTING STARTED WITH FILTEST 0 cee ce sence eeeeeeeeeeeneeeees 6 2 1 Meana FREST ossea Eaa 6 DM GON D ee EE AAE A E seeenaadieee 6 2 1 2 Other Operating Systems woriniudandtnndsuandeontonensxane tend nantoretinenaltadnlndbearnsnuindsandinteestenedtwnnlantaaousweietares 6 2 2 Getting a License for FiltEST saccosecsscicccceccececccasteesccceedecataeinncccveececcdesicecceveecicetasizencevsideauiesdzees
6. Figure 6 1 5 Using the Opacity slider the housing becomes transparent This can be helped easily e Move the Opacity slider in the Properties tab to the left You will see that the housing becomes transparent and both the filtering medium and the outlet appear see Figure 6 1 5 Finally we change the solid color of the inlet to red and the outlet s color to green We do this exactly as we did the color change for the housing i e select the corresponding data in the Pipeline Browser and use Edit in the Color section of the Properties tab By left clicking the viewer window and moving the mouse we can change the perspective Using the mouse wheel we can zoom in and out Playing a bit with this you will obtain a result similar to Figure 6 1 6 Visualizing data using ParaView De lesan JG be KRawtkeiwank FEec DB L g SB Pipeline Browser X Layout 1 X buitin EJES E PleatedCartridge_filter sti E PleatedCartridge _housing sti PleatedCartridge_inlet sti PleatedCartridge_outlet stl Pronertie 2 F apply Reset Search Properties PleatedCartridge_outlet stl Display GeometryRepresentation Color os Ciberes Flite represento Gue oo o Figure 6 1 6 Coloring the inlet red and the outlet green Changing the 3D perspective in the viewer window You see it is fairly simple to work with the viewer and with just a few manipulations you can preview an
7. more detail Simulation Flow Orly General Setup Project Name myProjecti Working Dir Geometry gt Geom Config Grid Levels 1 Material Settings Units SI Units Configure Fluid Configure Media Numerical Settings Flow Rate limin 0 Solver options Stark Save 339 FilticS Working with FiltEST 11 3 2 1 1 Geometry Setup You first have to specify on which computational grid you want to do the simulation e Browse to the voxelized geometry file you created with the Voxelizer before housing vti as Geometry Info e In the appearing dialog you can select the geometry file Dimension 3 to be used e Geom Config will invoke a dialog where you can view the Eee ae ge material information from the chosen geometry Tile Number of Inlets 1 Number oF Outlets 1 Number of media O 3 2 1 2 Material settings The next step is to specify the material parameters for the fluid and the filtering medium Note SI Units are used for Fluid and Media properties Configure Fluid will invoke a Fluid parameters dialog where the name fluid density and dynamic viscosity can be prescribed for the fluid Fluid Name myFluid under consideration as Fluid Pararneters Viscosity kgffms 0 Density kgfr 3 o Configure Media will invoke a configuration f media Configuration dialog where the filter medium can be given a name and the corres
8. 7 3 WORKING WITH WM esecetceeeciete ree secenceeccaieeepcececuedaeosaceccscqetstasesenses 8 3 1 PEC DFO COSS ING messia EEEN aiias 8 3 1 1 Providing the STL Geometry of the Filter Element Design 0 0 0 0 cceeccccccceeeeeeeteeceeeeeeeeeenees 8 3 1 2 Using TAC HIME ST Voxel Grid MOQUIE a cicthcadiaaneaninecsiaonsecetarednisnasaansmcacnieltsdenheuninehseisademsmnedasacs 9 3 2 SIU ACI ON ee E E E 10 ete ORI ASO HOW ON eesssiseeai seneesa a aikaan Aa E 10 3 22 VOXE based Flowand EINGENY eacsssssass E aE AN E 13 3 3 POSIDrOCESSIN O ieina r aE Eaa 16 4 SURVEY ON THE CASE STUDIES COMING WITH FILTEST 17 4 1 The on cal O eesi i 17 4 2 The yinarical NITET sorsien ees cece cee a aaa Eaa 18 4 3 Th PS ACCC car idg O roris aaaea Gaia 19 4 4 MNOS ALC DANE hoe E Seco eee entee s Ueaee seen eecuenacoe 20 5 RUNNING A DEMO EXAMPLE CONICALFILTER ccceeeeeees 21 6 VISUALIZING DATA USING PARAVIEW cccccceeeeeeeeseeeeneeneneeaes 22 6 1 Warm up Previewing the STL Q OMEetries ccccecsesseeeeeeeeeseeeeeeeeaseeeeseeaeneeesseeaeneeeees 23 6 2 Viewing FiItEST s visualization OUtTPUT cccceseceeeeeseeeseeeeeeeeeseeeeeseeeseeeesenaeneeeeseeaeneeeees 28 0 00 t 00 6 3 Creating streamlines in ParaView 7 LITERATURE 8 COPYRIGHT FOR FILTEST S so Frit ES Introductory remarks 3 1 Introductory rem
9. Recommended coarsest grid resolution voxel length 05mm Remark Pleated panels are very common in air filtration The demo version of FIItEST does not take into account effects occurring at high flow rates or Reynolds numbers If the simulation of such effects is essential for your work do not hesitate to contact US 339 FilticS Running a Demo Example ConicalFilter 21 5 Running a Demo Example ConicalFilter 1 H The FiltEST Demo projects are located in the corresponding user s Documents folder Here the ConicalFilter example is considered The folder contains a set of stl files and a subfolder 0 7mm The file with an underlying voxel size of 0 7mm discretized computational domain output of the Voxelizer is situated by the name housing vti in the folder 0 7mm This folder also contains two subfolders Flow and Efficiency_Singlepass with sample input files for each called input xml For running the flow only or the flow efficiency simulations do the following e Go to Module gt Solvers gt Voxel based Flow Only for computing Flow Only simulation OR Go to Module gt Solvers gt Voxel based Flow and Efficiency for computing flow and efficiency simulation e Load the corresponding input xml Tile e Browse and set your Working Directory e Browse for the geometry file housing vti e Click Run to start simulations e Wait until simulation has finished Results
10. be re used later via the Load function if the same dust is used for different simulations projects e The Lookup tables are used to find the proper values of the filtration model parameters depending on the flow velocity in the medium and the particle species channel The tables can saved and re loaded too For each filtering medium each particle channel you specify for a certain flow velocity range and a corresponding absorption the filtration model and the corresponding parameters NOTE The demo version supports only one channel one velocity and one parameter a The underlying model is Bae Ot i e the capturing rate is proportional to the concentration of dissolved particles More filtration models and tuning possibilities are available in the full version The identification of the filtration models together with the corresponding parameters has to be based on measurements for the considered test dust medium and range of flow rates 14 Simulation Flow Efficiency General Setup Efficiency setup Test Stand setup Test Stand Singlepass TFEM Multipass Singlepass eevee z Dust Info Mame xxx Channels 1 Configure Dust Save Dust Info Load Dust Info Lookup Tables Numerical Settings velocities 1 Numerical Optiions Configure LLITs Start and save Load LookupTables Hybrid Weights Run Load
11. correctly updating the permeability over time due to the captured particles in the filtering media e Specify the Thickness in mm of the filter medium e The change in permeability can be accounted for using the options in the Permeability Update Model by using either the Jackson James or the Hybrid model recommended The hybrid permeability model is an invention of Fraunhofer ITWM see 1 Computed K m 2 Ok Cancel 333 FilticS Working with FiltEST 3 2 2 1 Efficiency Setup Tab The Efficiency Setup Tab helps you configure the efficiency specific features by contiguring the test stand dust info lookup tables and numerical settings e The Test stand can be chosen to be one of the following see 1 1 3 o Single pass o Cyclic pass o Multipass based on ISO 16889 o TFEM e The duration of the filtration process is described by the Total time in seconds e The Dust considered for the simulations can have a name and can consist of several channels A Channel stands for a certain aggregate particle diameter In the full version FiltEST can simulate mixtures of up to 8 different channels where each channel is simulated independently from the others e The specific channel parameters such as density particle concentration and diameter are prescribed in the dust configuration dialog which appears with clicking Configure Dust The dust into can be saved and can
12. exist vti or vtu this group of files will be shown as a list that can be expanded by clicking on the arrow on the left Let s assume that we ran the efficiency simulation for a filtration process of 360 secs duration We will select the last visualization output file of that simulation run namely eff 360 vti see Figure 6 2 1 As we already saw for STL files clicking OK will preload the file Lookin D FiltEST DemoProjects ConicalFilter 0 7mm Efficiency Singlepass VisualizationOutput 7 di My Documents Filename Ji Desktop a E efft d Favorites E eff 120 vti D cA eff 240 vti Ji DA E eff 360 vti db FA E flow_2 vti Windows Network E grid vti open multiple files with lt ctrl gt key d VisualizationOutput dd PleatedCartridge dJ CylindricalFilter File name eff_360 vti Files of type Supported Files xyz okc h5 vshS vid rst POS CHG Cancel Figure 6 2 1 Loading a VTI output of an efficiency simulation run 339 FHT ESU Visualizing data using ParaView 29 64 bit File Edit View Sources Filters Tools Macros Help log ge oae QA ARR RR tk HOP DPB we Bes 2 Osco z S t gt e A A aa e G EOSO EAO EL amp Br Si X Layout 1X EEEE Propertie Gx F voor Reset 7 Search Properties eff_360 vti Cell Point Array Status ff Substance ff Levels ff Press
13. needed to getting started with the visualization of the FiltEST results as we shall see soon 339 FHtESU Visualizing data using ParaView 23 ml ParaView 3 98 1 64 bit File Edit View Sources Filters Tools Macros Help fe eC eon dC REE Elec EYO EAO e p O w I G X Layout 1 X Vas Figure 6 1 The ParaView main window with the Pipeline Browser the Properties Info tabs and the viewer window 6 1 Warm up Previewing the STL geometries Before you apply FiltEST s voxel grid generator to the STL geometry files you will probably want to take a look at these files For viewing checking and manipulating STL geometries there are a lot of free and commercial software tools available If you are just interested in viewing STLs you can use ParaView for this task too This is really easy as you will see and at the same time you will become more familiar with ParaView s user interface Let us consider the STL geometry data for the round pleated cartridge as an example The other case studies delivered with FiltEST and your own projects will work the same way The first step is of course the loading of the data to be visualized e Inthe File menu select Open and browse to the folder where the STL Tiles of the pleated cartridge are located Select the files you want to visualize To select them all left click on the first file in the list then press and while keeping this key pressed left
14. some zooming into the domain is shown in Figure 6 3 2 We are now ready to finalize the streamline generation e First we select Cell Data to Point Data as the active data set in the Pipeline Browser jpa f 5lice1 e Select the filter Stream Tracer with Custom Source from Edict Filters gt Alphabetical e You will be asked for the data Input for the stream tracer The default is set to the Cell Data to Point Data set that we created This is what we want and we therefore leave it as it is e Switch to the Seed Source section and EA select the data we created with the 5 et 20 8 Transform filter Contirm these settings ay with OK ceDatatoPointData e Go to the Properties tab There are many jp aa options to fine tune the setup the stream tracer look at the ParaView manual to learn more about them For now it is enough to Apply the stream tracer After some time of computation solid colored stream lines will appear Fite 1 Visualizing data using ParaView 38 Ee ok OM OD DD DIB lime o o E Da cme m Surface Ba ca xt tx te t 2t iz Bee A POSAOG oe Fr Ga R peline Browser X Layout 1 X StreamTracerWithCustomSource 1 eJ i ome Bok Velocity_mm_per_sec Magnitude Transform a 20 StreamTracerWithCustomSource1 391356 E StreamTracerWithCustomSource 1 j i 0 972665 enaa SATO Information Gx Fey ret Search
15. will be saved in the specitied working directory For running the Voxelizer e Browse and select a Working directory e Load stl files located in the folder FiltESTDemoProjects ConicalFilter e Assign a Material to each stl Tile e Prescribe the Voxel Length for the conical filter it is suggested as 0 7 e Click Voxelize e Wait until grid generation has finished e Resulting housing vtii Tile will be saved in the specified working directory 333 FilticS Visualizing data using ParaView 22 6 Visualizing data using ParaView For visualization FiltEST writes out the computed results in the VTK data format VTK stands for Visualization Toolkit and provides support for a variety of 2D and 3D visualization tasks cf the project s web site vtk org for more information If you are already familiar with this data format and its use you can safely skip this appendix If not we will show you in this section how you can take a first look at your simulation results by using ParaView Before we continue a few remarks are in order e We choose ParaView here as a sample visualization software For a list of other VTK tools you can take a look at the list given at vtk org Wiki VTK Tools e Fraunhofer ITWM is not related to the developers of VTK or ParaView so we cannot provide technical support or bug tixes for the VTK software tools themselves e However if you have questions or problems when
16. alizing data using ParaView 32 File Edit View Sources Filters Tools Macros F File Edt View Sources Filters CONCENTRATION_0_Num_PerVoxel t Levels FT Mass_0_oms_PerVowel Permeability_mm2 Fy Pressure_kPa Total_Mass_oms_PerVoxel l y o QEN a Velocity_mm_per_sec_ Figure 6 2 7 Choosing the data to be displayed left Activating a legend in the viewer window The viewer window shows the substance in the computational domain together with the corresponding legend see Figure 6 2 8 With the default coloring of the data values blue corresponds to the fluid part of the domain substance value 5 and the filtering medium is colored red substance value 10 In the same way you switch to the other data arrays stored in the VTI file such as the pressure the velocity the concentration etc You will see that the color legend will be adapted automatically each time you switch to a different data array However at this stage we are only able to see the surface values of the simulation results To take a look inside we will now use another important filter in ParaView The Slice Hil ParaView 3 98 1 64 bi enm File Edit View Sources Filters Tools Macros be ve eet us De butte FEEN D eff _360 vti gt emmm Information Search Properties Threshold1 Scalars Substance Lower 0 Threshold Threshold LJ w V All Scalars F Use Continuous Ra
17. anel appears In the frame on the left click on Change my environment variables e Using the New button add the following environment variable o Name FiItEST Value INSTALLDIR FraunhoterlTWIM FIItEST bin That s it Now you can e Start FIItEST by double clicking the shortcut either trom the desktop or the program menu 2 1 2 Other Operating Systems Concerning availability and installation on other platforms please contact us at filtest itwm fraunhofer de 339 FilticS Getting started with FiltEST 7 2 2 Getting a License for FiltEST You will need a license to use FiltEST E License Configuration BS 600 E ala 00 aa m ry FitEST requires a valid license File WARMING This software is protected by copyright law and international treaties Unauthorized reproduction or distribution of this software or any part of it may result in penalties and will be prosecuted to the maximum extent possible under the law Request License User name Organization Generate Request Install License Status Expiry date File name Close FiltEST e f no license is available provide your user name and organization and generate a license request e Generate Request will invoke a Save dialog to save a license request Tile suffix ae e Send the flr file to filtest itwm fraunhofer de to obtain a license file suffix lic e f you already have a FiltEST license proc
18. arks 1 1 About FiltEST The Filter Element Simulation Toolbox FiltEST is a collection of software modules developed to assist the designers manufacturers of filter elements in the developmental process Experience has shown that specialized CFD tools can reduce the time for the creation and optimization of filter element designs significantly FiltEST comes with a Graphical User Interface GUI to guide the user through the different stages of a simulation project and thus facilitate the work 1 1 1 Supported platforms System requirements e Operating systems At the moment FiItEST can be run on Windows 7 and Windows 8 both with 64bit architecture e FIItEST is suited best to run on multicore workstations for high performance simulations e The memory requirements depend on the type of geometries that are relevant for you Fine resolution of geometrical details in combination with relative large housings needs more RAM than running simulations on coarse computational grids A main memory of at least 64 GB is recommended for working with FiltEST e For the visualization of the results a 3D graphics card with at least 2 GB of dedicated VRAM is recommended 1 1 2 Basic features of FiltEST The basic features of FiltEST include the following Conversion of CAD data STL file format into computational voxel grid Numerical simulation of flow Numerical simulation of flow and efficiency Storage of results for visualization Storage o
19. ayout 1 Volume Wiretrame CAA Figure 6 2 3 Switching the representation of the data from Outline to Surface Fite 1 Visualizing data using ParaView 30 eee Bec jas ILII E Layout 1X uow Search oe Properties eff_360 vti Cell Point Array Status ff Substance ff Levels ff Pressure_kPa ff Velocity_mm_per_sec f Permeability_mm2 ff Total_Mass_gms_PerVoxel ff CONCENTRATION_0_Num_PerVoxel ff Mass_0_gms_PerVoxel SESE SSSS88 Display UniformGridRepresentation Color I show S2Rescale _ Figure 6 2 4 Representation of the VTI in surface mode The outline of the domain is now shown in solid white again the default Solid Color In order to view the real shape of our computational domain we will now apply the so called filter Threshold In ParaView there are a lot of filters with which you can perform operations on the VTK data sets They are located in the Filters menu There is an alphabetical list of all available filters some of which are active and some inactive depending on whether they can be applied to the currently considered data set or not There are other groupings of the filters as well After you have used ParaView several times you will find your favorite filters under Recent When using it the first time the Threshold filter we are looking for can be fou
20. by oxelizer input clicking on Browse In the appearing dialog Ena the user has the option to create a new directory if desired peat Browse e The STL files can be selected by clicking on Stl Geometry Files Load stl files In the appearing dialog Aa the user can select multiple STL files e Assign a Material to each of the STL files There should be at least one fluid inlet and BENA outlet geometry files for a complete description of the geometry Without inlet outlet or fluid the problem is considered incomplete e Enter the Voxel length It is assumed that the voxel length is prescribed in the same units as that of the STL geometry Tiles Number of stl Files 1 Voxelize automatically saves the current Voxelizer Parameters configuration as voxelizerInput xml in the voxelization method SCALE specified working directory This file can be re used mainan ate later via the Load function if you want to edit an old configuration for the Voxelizer After saving the configuration it will start the conversion of the oo STL data into a joint voxel grid A command line 4 wsie window will appear and the Graphical User Interface GUI will freeze until the Voxelizer has finished exited Tolerance 1 e 05 On successful completion the files housing vti and voxelizerLog txt are written in the working directory The content of the log fi
21. click on the last file in the list Press OK The selected files will be listed in the Pipeline Browser window of the ParaView main window see Figure 6 1 1 Fite 1 Visualizing data using ParaView 24 ee File Edit View Sources Filters Tools Macros Help PERR oae MANBPRR th NDP DIB mo a l b SE oon I BARR UAE EIGSEG ERLEEN m oe p oi g O aa oes Le EEN 3 PleatedCartridge_housing stl PleatedCartridge_outlet st operties Gx Drem o Search l j E Properties PleatedCartridge_outlet sti Display Figure 6 1 1 Preloading of the STL files The data sets are listed in the Pipeline Browser window Note that nothing is to be seen in the viewer window at this stage The reason for this is that ParaView has only preloaded the STL data In order to finalize the loading and visualization of the data sets do the following e In the Properties tab down on the left of the main window press the button Apply The STL surfaces appear in the viewer window on the right and the files in the Pipeline Browser window are marked with an eye symbol meaning that they are visible see Figure 6 1 2 i ParaView 3 98 1 64 bit E Qe 2 Osco a ee es RB ARRAAK FIGSEG TOCO Layout 1 X Drow PleatedCartridge_filter sti PleatedCartridge_housing stl PleatedCartridge_inlet sti Figure 6 1 2 Pushing Ap
22. d beautify your imported CAD data You can consult the Information tab next to Properties to learn some more details about the data set that is currently selected in the Pipeline Browser see figure on the right In the example shown we see that the surface of the housing consists of 10938 cells triangles in the case of STL that share 5471 points Furthermore the bounding box of the STL is described in terms of X Y and Z range If you want to unload some data set just select it in the Pipeline Browser by left clicking it and press the key Alternatively you can right click the data set and choose Delete in the menu that appears To unload all data sets at once left click the first data set and then press with left clicking the last data set This will select all sets and you can delete them together PleatedCartridge_filter stl FieatedCartridge_inlet sti E PleatedCartridge_outlet stl Filename PleatedCartridge_housing stl Path EST DemoProjects PleatedCartridge Statistics Type Polygonal Mesh Number of Cells 10938 Number of Points 5471 Memory 0 41 MB Data Arrays Name Data Type Data Ranges Bounds X range 40 to 60 delta 100 Yrange 40 to 40 delta 80 Zrange 0 to 90 delta 90 ssoFilticsl Visualizing data using ParaView 28 6 2 Viewing FiItEST s visualization output As we mentioned earlier you can choose between two different VTK formats for the visual
23. de whether only you or everyone is allowed to use the software The installation directory you choose will be stored in the variable SINSTALLDIR to which we shall refer in the following The installation directory will contain a folder FraunhoferITWM with a subfolder called FiltEST In this directory there are the following folders e bin This directory contains all the necessary executables libraries etc e Documentation This folder contains this manual The installation also comes with a set of ready to start with demo projects located in the user s Documents folder with the name FiltESTDemoProjects Furthermore a shortcut to FiltEST is created on the User s Desktop and Program Menu Once the installer has finished successfully the only thing that remains to be done Is to add one additional environment variable called FiltEST Note You do not need administrator privileges if you deal only with your own environment variables On the other hand if there is no system wide FiItEST environment variable each user of FIItEST will have to add the variable to his her environment e Windows 7 Click on the Start button and select Control Panel e Windows 8 On the Start screen click on Desktop On the Desktop move the mouse pointer to the upper right corner of the screen and among the icons that appear select Settings gt Control Panel e Go to User Accounts and Family Safety gt User Accounts The user account part of the Control P
24. e you stopped 339 FHT ESI Literature 39 7 Literature 1 O Iliev Z Lakdawala R Kirsch K Steiner E Toroshchin M Dedering V Starikovicius CFD simulations for better filter element design Filtech 2011 Conference Proceedings Volume 2011 ISBN 978 3 941655 011 0 181 188 2 Jackson GW James DF Permeability of fibrous porous media Can J Chem Eng 1986 64 3 364 74 8 Copyright for FiltEST ITWM FiltEST Version Demo Version 18 Feb 2013 CopyRight tc 2013 All rights reserved Warning This computer program is protected by copyright law and international treaties Unauthorized reproduction or distribution of this program or any portion of it may result in severe civil and criminal penalties and will be persecuted to the maximum extent possible under the law FiltEST development is led by Prof Dr Oleg Iliev and performed by Dr Ralf Kirsch and Dr Zahra Lakdawala The development team is working at Fraunhofer Institut f r Techno und Wirtschaftsmathematik ITWM ss Faltics I Filter Element Simulation Toolbox Dept of Flow and Material Simulation Fraunhofer Institute for Industrial Mathematics ITWM O Iliev R Kirsch Z Lakdawala 2013 03 24 filtest itwm fraunhofer de http Awww itwm traunhofer de filtration
25. eed with Load License and browse to the location of the license e f the status is returned as Valid proceed further with working with FiltEST Else contact the FiltEST team for further assistance Once the license file is correctly loaded its location is written down in a FiItEST configuration file called filtest ini The file is situated in the user s local directory For ease of use the user can specify its own default directory for storing simulation projects This can be done via File gt Set Default Directory The path given there is also saved in the file filtest ini eee ele SFilticS Working with FiltEST 8 3 Working with FiltEST As with most CFD tools the work flow for FiltEST is divided into the following three main parts e Preprocessing o CAD data for housing filter medium inlet and outlet are transformed into a numerical simulation domain e Simulation o Choice of the simulation type flow only or flow with efficiency simulation o Setting material parameters for fluid filtering medium etc o Adjusting numerical parameters if necessary o Running the simulation e Postprocessing o Visualization of the result o Export simulation for further data analysis In the following sections you will be guided through the work with FiltEST 3 1 Preprocessing The preprocessing part of FIItEST is situated in the Module menu under Gridders Since we are considering the demo ver
26. erence is that during the simulation for each time interval the upstream concentration is set to the downstream concentration computed in the previous time interval Multi pass Inlet and outlet of the filter element are connected to a reservoir or mixing tank The reservoir tank in turn is connected to an injection tank trom which the feed is injected into the reservoir tank with a specified injection flow rate and concentration Initially the reservoir is filled with clean fluid The filter element receives its feed at a specified system flow rate from the reservoir tank Downstream of the filter element the filtrate leaves the system with the injection flow rate to ensure the fluid volume in the filter system is always constant The rest of the filtrate enters back into the reservoir tank The upstream concentration depends on the feed coming trom the injection tank and the feed in the reservoir tank including the filtrate returning into the reservoir tank from previous time interval Transmission Filter Effectiveness Method TFEM This is specific tor automotive transmission filters For further details concerning TFEM setup contact the FiltEST team at Tiltest itwm tfraunhofer de Additional features of the full version Local refinement of the computational grid High performance linear solvers Simulation of particle mixtures i e more than one channel More efficiency test settings More filtration models Additional Optional Features
27. f macroscopic efficiency quantities in text format for later analysis in form of an Excel worksheet or similar 1 1 3 Test Stands for Efficiency Simulations The filtration efficiency is conventionally evaluated on the basis of certain international standards or company specific certified lab standards FiltEST simulates efficiency test by using timely approximations on discrete time intervals For all test stands we assume the following e The filter element is connected either to the pressure or suction side of the pump e The concentrations upstream and downstream of the filter element or medium to be evaluated are measured The feed enters through the inlet of the filter element and the filtrate leaves at the outlet of the filter element However for running the case studies that are included in the software package 16 GB of RAM are sufficient so Frit ES Introductory remarks 4 The measurements are performed either for a fixed time period or until the filter element is completely clogged which is monitored by specifying a terminal pressure drop Perfect mixing is assumed FiltEST offers the following choice of test stands 1 1 4 j PA Ul 1 2 Single pass The particle concentration at the inlet of the filter remains constant in time i e it is always equal to the specified initial value Cyclic pass The initial condition is specified as for the Single pass setting The diff
28. filter element design for the clean flow regime you will want to know how the device performs when both flow and filtration are considered e Choose Module gt Voxel based Flow and Efficiency Among others another tab appears called Efficiency setup e The General setup is done as described in Section 3 2 1 with two exceptions 1 Configure Media provides more options 2 You can select the type of the Filtration Model Note You can load the general setup from a previous Flow simulation project too It is possible to specify the clean permeability for the filtering medium in three different ways using the K Model option e Flow Permeability This is a fixed value of permeability as in the general flow setup e ISO 9237 If this option is selected the clean permeability for the simulations is interpreted from the ISO 9237 specification of Air permeability This option will invoke a dialog enabling the user to enter the Air permeability pressure drop and media thickness to compute the permeability needed for simulations e Jackson James This option computes the clean permeability using the Jackson James formula see 2 and is depending on the average fiber radius porosity and media thickness parameters This option is mainly suitable for a fibrous filter medium For this model the value of the Fiber Radius in um is needed e Specify the Clean Porosity value between O and 1 of the medium in clean initial state for
29. hat a good Name streamline source Is CONCENTRATION_O Num_PerVoxel f Levels Mass_0_gms_PerVoxel e set of points distributed in e a disk shaped region of which the center is the point 0 35 0 35 77 6 and with radius 79 We choose the radius a bit smaller than the housing dimensions to make sure that the streamline sources really lie in the interior of the domain Permeability_rom2 Pressure_kPa Substance Total_Mass_gms_PerVoxel o a 2 Velocity_mm_per_sec Tl Bounds X range 80 5 to 79 8 delta 160 Y range 80 5 to 79 8 delta 160 Z range 2 1 to 77 7 delta 79 8 Time To accomplish the streamline seed generation we will use ParaView s Sources functionality which among others allows us to generate data sets based on geometric primitives e To this end we choose Disk in the Sources menu As we expect this adds a Disk item to the Information list in the Pipeline Browser e Going to the Properties tab we find that we Reset 96 Delete 2 can configure the geometrical properties of the Properties Disk1 ke disk here The main properties namely the Inner and Outer Radius of the disc can be set immediately e A more detailed setup of the disk is done by clicking on the button with the gear icon Now we can configure the Radial and the Circumferential Resolution too The numbers we put here determines how many seed points and therefore
30. he visualization of results FiltEST offers a lot of flexibility by storing the data in VTK Visual Toolkit format O O Currently the VTU unstructured grid and VTI image data formats are Supported The files for visualization are stored VisualizationOutput If you are not familiar with the VTK format and corresponding viewers yet you will find a short introduction in section 6 n a subfolder called For subsequent processing of the key results obtained in an efficiency simulation an additional file efficiencyExcel fest is written You can import these data into a worksheet 339 FilticS Survey on the case studies coming with FiltEST 17 4 Survey on the case studies coming with FiltEST In order to give you a starting point for your work with FiItEST some geometries with sample input files come with the software In this section we will briefly introduce them For each example we will give a recommendation for the voxel length to ensure that 16 GB of RAM are sufficient for the corresponding simulation If the machine on which you run FIItEST has more memory you can try finer resolutions of course 4 1 The conical filter Figure 4 1 1 The conical filter housing blue with the flat sheet filtering medium white inlet red and outlet green area ca 203 54 cm Outlet area ca 51 77 cm Fluid nousing volume ca 1110 cm Recommended coarsest grid resolution voxel length
31. ill be applied e In the Properties tab locate the Color frame and press the button Edit A dialog window will appear in which you can choose the new color for the housing surface The result is shown in Figure 6 1 4 Still the pleated filtering medium inside is invisible because the surface of the housing is covering it E File Edit View Sources Filters Tools Macros Help D S 4 esate color v Surface BSOSS9OSIO P O0 w Oi Y m mw BAVA Pipeline Browser Gx Layout 1 X f builtin HE PleatedCartridge_filter sti PleatedCartridge_housing stl PleatedCcartridge_inlet st PleatedCartridge_outlet stl D rese 2 Search Properties PleatedCartridge_housing stl Display GeometryRepresentation Color Solid Color X s JA naeeua Fea PrO0OwMEY Figure 6 1 4 New color here blue for the housing STL Note the white inlet STL at the end of the inflow channel Fite 1 Visualizing data using ParaView 26 Jl ParaView 3 98 1 64 bit File Edit View Filters Tools Macros Help BY Be k dk OM D gt DD DIB iine o PECTED ETT EETA H0O R OEA OA X Layout ix Aa oa H PleatedCartridge_inlet sti Pleatedcartridge_outlet stl Gx Froo Oren oae 2 Properties PleatedCartridge_housing stl Display GeometryRepresentation Color e T son
32. in ParaView take a look at the software s documentation especially on the Glyph filter On the web you will also find tutorials on this subject Here we will use the 3D velocity data to visualize the streamlines This is a bit more advanced than the previous tasks but once you ve done it for the first time it will soon become a routine for you 339 FHtESU Visualizing data using ParaView 35 ParaView 3 98 1 64 bit oc lee So File Edit View Sources Filters Tools Macros Help LERRO Bia gt I gt DT R tme 0 lece OS jE wb ix t zt iz AL EAO E Ae Ca ae W eS Properties CellDatatoPointData 1 Pass Cell Data Piece Invariant Display UnstructuredGridRepresentation Color saca Figure 6 3 1 Converting cell data to point data Since we are interested in the streamlines for the whole domain we first hide the slice that we created in the previous section by left clicking on the eye symbol next to the Slice data set in the Pipeline Browser Next we turn on the visibility of the Threshold data set by clicking on its eye symbol Since we will want to have the shapes of the housing and the filtering medium together with the streamlines in one plot we use the Opacity function in the Properties tab to make the Substance data transparent In ParaView streamlines are generated on the basis of point data whereas FiltEST writes out cell data In
33. ization output e VTU format This is the VTK file format for unstructured grids At first glance this seems to be a weird choice for computational domains based on voxels On the other hand it allows for storing the visualization data for only those voxels that are relevant for the computation which is good for domains that differ a lot from a cuboid On the other hand rendering can be quite slow for large simulation projects e VTI format This is the VTK image format i e the natural file format for voxel based visualization output in cuboids In many cases this will be a better choice with respect to both rendering speed and size of the output Tiles If the computational domain is not a cuboid which will be the case in general the remaining part will be filled with a pseudomaterial that you will have to make invisible before you continue with the examination of your results We will now consider the case that we have run an efficiency simulation for the conical filter and decided to write the visualization output in the VTI format We will see how the oseudo material is made invisible Once this is done the further treatment of the data is same for VTI and VTU Loading the data is done in the same way as for the STL The visualization output is located in the subfolder VisualizationOutput of your project s working directory Select File gt Open and browse to that subfolder If several files with the same suffix
34. le can be viewed in the GUI at any time via Menu gt View gt voxelizerLog 333 FIELES 3 2 ae jt Dero Version File Module Wiew About Creator Gridders b Working with FiltEST 10 Home Ole rs b rrop raan Tyr EI Working Dir Geometry es VWoxel based Flow Only Voxel based Flow and Efficiency Quadri based Flow Orly Quadri based Flow and Efficiency Simulation T Te The simulation part of FiltEST is situated in the Module menu and it is called Solvers The demo version works with Voxel based Flow Only and Voxel based Flow and Efficiency solvers 3 2 1 Voxel based Flow only The setup of a flow simulation project is done in the General Setup tab It is divided into the following steps Assign a Project Name to your simulation Select a working directory by clicking on Browse In the appearing dialog you can create a new directory if desired Select a Working Directory where input and output Tiles of the simulation will be stored Choose the Geometry i e the grid on which to the simulation will run Set the Material parameters for the fluid and the filtering medium Specify the Numerical Settings with optional fine tuning of the numerical tools and selection of the visualization output format In the following we will present these subtasks in
35. nd in the Alphabetical list or under Common see Figure 6 2 5 left Pipeline Browser F x E builtin l jeft_s60 vii Thresholds iF ParaView 3 98 1 64 bit piai File Edit View Sources Tools Macros Help Search Ctrl Space ii ae a Recent AMR CTH Common Calculator OO me Of A 7 i Properties Information me e G we T Cosmology Contour 7 Data Analysis ai Ch fl zie Pipeline Browser a ays Clip Material Analysis r sice D Reset statistics 8 Threshold Search Temporal Extract Subset Properties Threshold 1 CEREN Glyph Stream Tracer Scalars J substance Warp By Vecto Lower ol i a en Threshoki ol 20 Group Datasets T L 10 Extract Level Threshold All Scalars Figure 6 2 5 Selecting the Threshold filter in Filters gt Common left Removing the pseudo material by cutting off negative substance values right 339 FHT ESU Visualizing data using ParaView 31 Layout 1 X ry PrO Gx ee f Properties Threshold1 Scalars Substance 0 Lower s Threshold Upper Threshold H o V All Scalars Use Continuous Range Display UnstructuredGridRepresentation a Color E Show whe Edit So Res r m r Figure 6 2 6 After application of the Threshold filter and changing the perspective The usage
36. nge Display UnstructuredGridRepresentation aq Color sustan JL Toggle Color Legend Visibility Figure 6 2 8 3D surface visualization of the Substance data with legend 339 FHtESU Visualizing data using ParaView 33 Wil ParaView 3 98 1 64 bit File Edit View Sources Filters Tools Macros ae TEC e E FE 19 g 1 p oz 2 F Co 3 C8 w C i Layout 1 X SEEDA Figure 6 2 9 Preparing a central slice in the yz plane For viewing a central slice in the yz plane do the following e Select the Slice filter from Filters gt Common This will add a slice data set to the Pipeline Browser and the properties of this filter will be shown in the Properties tab e Select X Normal to create a slice in the yz plane The slice is placed in the center by default see Figure 6 2 9 e Apply the Slice filter and disable the Show Plane option in the Properties tab see Figure 6 2 10 Fle Edit View Sources Filkers Toots Macros Help Be eRP oe amp GANBSER kh HGP DB meo T OCE a Ge a Gl cs 2d O5 ct ct ts Fae a EE X Layout 1 X i EIEE Properti Gx Fro reer aos 2 Search A Properties Slice 1 Display GeometryRepresentation Color Gi substance meal Figure 6 2 10 After application of the Slice filter Ie
37. of the filter is as follows e Select the Threshold filter as described above The filter appears as active data set in the Pipeline Browser window Additionally the Properties window shows now the properties of the Threshold filter e Select Substance i e the material data stored in the VTI file from the Scalars list By default the Lower Threshold value is set to 1 This value corresponds to the pseudo material that completes the cuboid for the image data To make this part of the domain invisible increase the value to 0 You can do this either by using the corresponding slider or just by typing that value in the text entry field see Figure 6 2 5 right e Apply the Threshold filter The pseudo material will disappear leaving the real computational domain visible Changing the perspective in the viewer window you will get a result similar to the one shown IN Figure 6 2 6 Remark Note that the currently active data set is the result of the threshold filter Everything we will do from now on will be applied to this data set If your visualization output was written in VTU format the previous application of Threshold would not be needed so you would join at this point here For the surface representation still Solid Color is used This can be changed by selecting a different data set e g Substance see Figure 6 2 7 left After this we can add a colored legend to the viewer window Figure 6 2 7 right Fite 1 Visu
38. order to use the streamline functionality of ParaView we first have to apply the filter Cell Data to Point Data You find this in Filters gt Alphabetical Before selecting this filter make sure once again that the Threshold data set is the currently active one in the Pipeline Browser The Cell Data to Point Data item appears in the Pipeline Browser and the properties of this new filter is shown in the Properties tab There is nothing to change here so you can directly Apply the filter The Substance data are hidden and the Cell Data to Point Data set is shown in the viewer window using the solid color Let s use the Opacity slider and set it to some small value say 0 2 for now see Figure 6 3 1 The next task is to generate the seeds i e the source or starting points of the streamlines We want to have them distributed on almost the entire inlet area of the housing which is the upper disk shaped region of the domain In order to generate the seeds with the proper distribution we need to know some details about the geometry of that inlet region 333 FilticS Visualizing data using ParaView 36 a le CellDatatoPointData1 Therefore we switch to the Information tab to learn more about our Cell Data to Point Data set The information that we are looking for namely the Properties Information Bounds is found when scrolling down in that window __ infermation The bounds we find there indicate t
39. ply in the Properties tab makes the STLs visible F builtin PleatedCartridge_filter stl ST Pleatedcartridge_housing stl PleatedCartridge_inlet sti PleatedCartridge_outlet sti 00A e Properties Information Properties G x D se T Apply Search Properties PleatedCartridge_housing stl Display GeometryRepresentation Color Zs Visualizing data using ParaView i builtin PleatedCartridge_filter stl PleatedCartridge_inlet sti PleatedCartridge_outlet st Properties Properties ax e gm Search Properties PleatedCartridge_housing stl Apply Display GeometryRepresentation Color a la Show 25 Basic colors Eee eee Bee eo EERE EERO tt ht aie Custom colors LILILILICA LOLOL Hue 200 Red 0 Sat 255 Green 170 Val 255 ox cme Blue 255 Figure 6 1 3 Selecting activating a data set in the Pipeline Browser left and choosing a new Solid Color right using Edit All STL surfaces are colored white which is the default setting for Solid Color for binary STL Tiles see the corresponding entry in the Properties tab However this can be changed individually tor each STL data set See Figure 6 1 3 e Go to the Pipeline Browser window and click on PleatedCartridge_housing stl By this you mark the corresponding data set as the one to which the subsequent manipulations w
40. ponding permeability can yodini be prescribed If the button labeled ISO 9237 is ph a clicked the permeability for the simulations is 9 msbllyintd pet interpreted from the ISO 9237 specification of Computevis 180 937 Air permeability This option will invoke a dialog enabling the user to enter the Air permeability pressure drop and media thickness to compute the permeability needed for simulations eee 0000 SFilticS Working with FiltEST 12 Solver Configuration 3 2 1 3 Numerical Settings Numerical Parameters The volumetric flow rate is to be specified here this information is used for setting the inlet velocity boundary condition in the simulations Time step s 0 001 Maximum Timesteps 99 Epsilon_dt 0 0001 Num Iter Info Saved 5 Solver options will invoke a dialog enabling the user to Epsilon_dp 0 01 modify numerical and linear solver parameters for optimal Convective Scheme Lipwind performance for speed and or accuracy Averaging type Arithmetic The default settings should work fine in many cases You Linear Solver Parameters can leave them as they are unless you know what you are BiCGStab doing Max velocity iterations FIItEST uses an iterative scheme for the solution of the Stationary flow through the filtering medium We restrict ourselves to the most relevant points here Max pe iterations Epsilon_vel Epsilon_p e Maxim
41. sion we will deal with the option of Voxel Grid only as FiltEST Demo Version File View About Sin feometry Creator Hon ridders d voxel Grid Sere p Quadrilateral Grid eel an a E yd Ci 3 1 1 Providing the STL Geometry of the Filter Element Design The module Voxel Grid supports the STL file format as input for the geometry This file format is very common and can be exported by most CAD tools Note The Voxel Grid generator assumes that the STL files are correct in the sense that there are no holes in the surface no hanging edges or overlapping facets etc Most CAD tools provide a corresponding checking functionality and there are free softwares available for this purpose too The Voxel Grid expects the following STL files for the interior of the housing the geometry of the inlet s the geometry of the outlet s the geometry of the filtering medium media 339 FilticS Working with FiltEST 9 Note The demo version of FiltEST allows for only one inlet one outlet and one filtering medium 3 1 2 Using the FiltEST Voxel Grid Module The Voxel Grid generator converts the STL geometry as specified in Section 3 1 1 into the three dimensional image data format The voxelized geometry is written in a file called _housing vti For this the user needs to configure the Voxelizer Input in the following way e The working directory can be selected
42. streamlines will be generated e Clicking on Apply will create a disk in with these Inner Radius 0 Outer Radius 79 Radial Resolution 16 Circumferential Resolution Display GeometryRepresentation mM 60 EHE Diski a Transformi pm ii properties in the viewer But the disk is still infomation centered at the origin 0 O 0 aa e To change this we apply the filter Transform Reset ie iB that can be found in Filters gt Alphabetical n the properties of this filter we can enter the ane ere values we figured out above into the Translation sansform m fields Finally we Apply the transformation E e Finally we want to see the seed points instead of 55 m the disk Therefore we change the ae gt 22 representation of the transformed disk from gae 3 x Surface to Points and uncheck Show Box Reset Bounds 339 FHT ESU Visualizing data using ParaView 37 R SRSA E T T Gs auer aar EOE G OLE AAE AORC Ei Se gw og Pipeline Browser Layout 1 X Threshold B2oae DW 5ice1 cellDatatoPointData1 Diski Transform e 60 86 m A Gx wooly _ Reset Properties Transform 1 Display GeometryRepresentation Color a E Show he Edit gt Rescale Vicihle ia Fdit CuheAxes m Figure 6 3 2 Streamline seed points created using the Disk source The result of these steps and
43. t Ig Je OOO FiltieSi Visualizing data using ParaView 34 Hil ParaView 3 98 1 64 bit File Edit View Sources Filters Tools Macros a Ma ieee so am ETETE AA a G9 G Layout 1 X Bl buitn we Weft 360 vti A y heshoid Velocity mm_per_sec Magnitude Slice1 10 20 30 o emmi TESA thE a Ee S S a a C A 0 91256 35 41024 Fer Or T merg B E Crinkle slice F Triangulate the slice Display GeometryRepresentation Color cubesres E Vt Remresentaton Sute 7 Figure 6 2 11 Switching to the velocity data array and moving the legend Note that the Slice data set is now the active one in the Pipeline Browser and the only visible data set Switching to a different data array will therefore affect only the slice in the xy pane To confirm this we change the data array to be visualized to Velocity_mm_per_sec Magnitude In addition we drag and drop the color legend to a position on top of the plot see Figure 6 2 11 6 3 Creating streamlines in ParaView In the previous section we plotted the magnitude of the velocity flow speed in a slice of the domain However FiItEST does not store the magnitude only it computes the 3D velocity vectors in each cell and these vectors are stored in the visualization output too Of course one wants to benefit from this additional information when visualizing the velocity There are methods to visualize vector and even tensor data
44. te re computations of flow or at each time when flow is recomputed As an advanced setting in the Efficiency Setup tab the user a can also adjust the contribution of each particle species to the total pressure drop by configuring the Hybrid weights Media 1 The Hybrid Weights are additional parameters with which Channel jt you can adjust the contribution of each particle species to the permeability change for each medium In this sense the contribution of each particle species and media can be different in computing the total pressure drop Even when considering only one particle species this setting allows you to getter a better matching of the simulation results with measurements After this step your simulation project is ready to Run As always your settings will be automatically saved into the XML file that you specitied in the General setup tab and a command window appears The GUI freezes until the simulation has finished 333 FalticS Working with FiltEST 16 3 3 Postprocessing On successful completion of simulations the computational history for the Flow Only solver and the Flow Efficiency Solver is written into the working directory The summary files are flowSummary fest and efficiencySummary fest respectively A simulationLog txt file is also written in the working directory This can be loaded in the GUI at any time using Menu gt View gt Simulation Log For t
45. txt will be written in the working directory A folder called VisualizationOutput in the working directory will contain the VTI or VTU files for visualization The file simulationLog txt file is also written in the working directory This can be loaded in the GUI at any time Menu gt View gt Simulation Log 333 FalticS Simulation Flow Efficiency General Setup Efficiency setup Project Mame myProject1 working Dir Browse Geometry File Format WxL Browse 3 Geom Config Grid Levels 1 Material Settings Units ST Units Configure Fluid Configure Media Numerical Settings Flow Fate limin oO Solver options StarklSave Filtration Model MediaType 1 Depth l Load Save S Run is Configure Filter Media Media 1 K hodel Flowr P bility 0 9237 Jacks James Clean Permeability mn 2 Clean Porosity Fiber Radius microns Thickness mm Permeability Update Model Hybrid as Air Permeability Converter Specify air permeability according to ISO 9237 Air permeability mm s Pressure drop Pa Media thickness caliper mm NOTE The filter medium thickness for the ISO measurement might differ From the thickness in the simulation a Working with FiltEST 13 3 2 2 Voxel based Flow and Efficiency Once you have found a good
46. um Timesteps refers to the maximum number of iterations to be performed in the flow solver e Epsilon_dt and Epsilon_dp are threshold values specifying when the flow is considered to be stationary afore e For the linear solver BiCGStab mehod is used Restart Start From beginning Start Save will invoke a Start and Save Options dialog Save step l The Restart option provides the user with options of Visualization File Format VTL restarting the simulations from precious run especially ies useful in cases where there is already a result of expensive flow simulation for the same setup However for the demo version there is only Start trom beginning as the restart option With Save step the user can configure the storage of results for the flow solver output will be written after that many iterations The Visualization File Format can be either of VTI or VTU format For further details see the section on Visualization for more details Once you have specified all these input parameters you are ready to Run the flow simulation e Your current configuration will be automatically stored in a corresponding XML file in the selected working directory This file can be re used later via the Load function After saving the configuration the actual computation starts A command line window appears and the GUI application will freeze until the simulation is finished exited e On successful completion flowSummary
47. ure_kPa ff Velocity_mm_per_sec ffl Permeability_mm2 ff Total_Mass_gms_PerVoxel f CONCENTRATION _0_Num_PerVoxel V A Mass_0_gms_PerVoxel Display UniformGridRepresentation Color sadcie E Figure 6 2 2 VTI data set is loaded using the Apply button A list of the contained data arrays is shown in the Properties tab the outline bounding box of the visualization in the viewer window As we already saw in the previous section the file appears in the Pipeline Browser window But in contrast to the case of STL files we observe that a list of data arrays is shown in the Properties tab These are exactly the quantities that FiltEST is writing out for visualization Note the check box next to each data array You can check or uncheck data arrays depending on whether you are interested in visualizing them or not Again the data is only prepared for visualization so we have to push the Apply button in the Properties tab to finalize the loading of the data We observe that the outline of a cuboid appears in the viewer window see Figure 6 2 2 In order to visualize the computed results we have to switch the representation from Outline to Surface see Figure 6 2 3 ParaView 3 98 1 64 bit File Edit View Sources Filters Tools Macros Help eb Soe amp GaN Ss a E en lOi cater Le Bl i a OSE AOG 30 Glyphs Outline Foints Slice Surface Surface With Edges L
48. visualizing the VTK output created by FiltEST please do not hesitate to contact us Getting and installing ParaView ParaView is open source software available for various platforms Windows Linux and Mac OS X It can be obtained from the web site www paraview org You will find the binary in the section RESOURCES gt Download There you can choose version download type operating system and the actual file For example we will assume here that we download the software for Windows 64bit namely the binary installer for version 3 98 1 which is the current one while writing this short Introduction Installing ParaView is straight forward and does not really require much interaction by the user Note that you need administrator privileges for the installation of ParaView You will be asked the standard installation questions destination folder agreement to terms and conditions of the license and the components to be installed and normally the default settings should be fine for you Note that a ParaView manual in PDF format is included in the installation If there are questions that remain open after reading the really short introduction we are giving here you will probably find what you need there After the installation you can launch the program trom the Windows Start menu The main window will appear as shown in Figure 6 1 Although the number of buttons and menus looks impressive at first glance only few of them are
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