SVAirFlow Tutorial Manual
Contents
1. Tite Variable Restriction Projection Solver Option air pressure ua Display and Sav Y vectors fluxax fluxaz Display and Sav Mesh Display and Say Add New Plot KEZ el Rl Copy Delete Properties Multiple Update a Add Defaults Default Plt In order to find out the amount of air flowing into the basement we must define a surface flux across the Surface 2 the basement floor and restrict it to the BasementiIn region Follow these steps to define this 12 Open the Plot Manager dialog by selecting Model gt Reporting gt Plot Manager SOILVISION SYSTEMS UTD A Three Dimensional Example Model 20 of 22 from the menu 13 Select the Surface Flux tab and press the Summary Plot button from the Add New Plot area 14 The Plot Properties Surface Flux dialog will appear Select Surface 2 from the Surface drop down 15 Type in Crack Flow as the name of the Surface Flux and Restrict to Region Basement Additional plots may be defined by pressing the Default Plots button on the Plot Manager OUTPUT MANAGER Model gt Reporting gt Output Manager Two types of output files will be generated for this tutorial example model a transfer file of air pressure and a dat file to transfer the results to ACUMESH 1 Open the Output Manager dialog by selecting Model gt Reporting gt Output Manager from the menu 2 The toolbar at the bottom left corner of the dialog contains a b2. Press OK to return to the Plot Manager dialog Click OK to close the Plot Manager dialog and return to the workspace There are many plot types that can be specified to visualize the results of the model A few will be generated for this tutorial example model including a plot of the solution mesh air pressure contours and flux vectors These plots may be automatically generated by pressing the Add Defaults button ip Plot Manager X m aj xj Plots Point Atea Volume Min Max Flux Sections Boundary Flux Other Title Variable Restriction Solver Option ua Display and Sav a fluxax fluxay Display and Sav Display and Sav Add New Plot w B z el g Copy Delete Properties Multiple Update al AddDefauts Defaut Pot f Run Model Solve gt Analyze The next step is to analyze the model Select Solve gt Analyze from the menu This action will write the descriptor file and open the FlexPDE solver The solver will automatically begin solving the model SOILVISION SYSTEMS LTD A Two Dimensional Example Model 12 of 22 g Visualize Results Window gt AcuMesh The visual results for the current model may be examined by selecting the Window gt ACUMESH menu option or clicking on the ACUMESH button 2y on the processes toolbar 2 2 Results and Discussion A contour plot of the completed model results can be seen below All outputs previously specified can now be visual
3. SVAIRFLOW 2D 3D AirFlow Modeling Software Tutorial Manual Written by Robert Thode B Sc G E Edited by Murray Fredlund Ph D P Eng SoilVision Systems Ltd Saskatoon Saskatchewan Canada Software License The software described in this manual is furnished under a license agreement The software may be used or copied only in accordance with the terms of the agreement Software Support Support for the software is furnished under the terms of a support agreement Copyright Information contained within this Tutorial Manual is copyrighted and all rights are reserved by SoilVision Systems Ltd The SVAIRFLOW software is a proprietary product and trade secret of SoilVision Systems The Tutorial Manual may be reproduced or copied in whole or in part by the software licensee for use with running the software The Tutorial Manual may not be reproduced or copied in any form or by any means for the purpose of selling the copies Disclaimer of Warranty SoilVision Systems Ltd reserves the right to make periodic modifications of this product without obligation to notify any person of such revision SoilVision does not guarantee warrant or make any representation regarding the use of or the results of the programs in terms of correctness accuracy reliability currentness or otherwise the user is expected to make the final evaluation in the context of his her own problems Trademarks Windows is a registered trademark of M
4. at the top of the workspace Enter the geometry as given below Geometry in the SVOFFICE software may be i typed in manually ii cut and pasted from Excel or directly from the tutorial manual iii imported from AutoCAD or iv drawn graphically using the CAD window In this example we will provide instruments for drawing the geometry using the CAD window Prior to drawing geometry shapes it is good to ensure that snapping is turned on by clicking the Snap On at the bottom of the drawing space e Define the SandyRegion Ensure the SandyRegion region is current in the region selector drop down 2 Select Draw gt Geometry gt Region Polygon from the menu or press the toolbar button a 3 Move the cursor near 0 0 in the drawing space and left click the button to initiate drawing the shape You can view the coordinates of the current position SOILVISION SYSTEMS LTD A Two Dimensional Example Model 8 of 22 the mouse is at in the status bar just below the drawing space 4 Now move the cursor to subsequent points on the region clicking once on each region point 5 For the last point move the cursor near the point 0 50 and double click on the point to finish the shape A line is now drawn from 24 50 to 0 50 and the shape is automatically finished by SVAIRFLOW by drawing a line from 0 50 back to the start point 0 0 If the SandyRegion geometry has been entered correctly the shape should look like the model diagram
5. 101 2 kPa Oe ee Select the Crack region in the drawing space Select Surface 2 from the surface drop down From the menu select Model gt Boundaries gt Boundary Conditions Click the Surface Boundary Conditions tab Select the Pressure Expression boundary condition and enter a value of 101 2 in the expression box Close the dialog using the OK button NOTE SOILVISION SYSTEMS UTD A Three Dimensional Example Model 18 of 22 The remaining Surfaces are by default set to the None boundary condition which is treated as a Zero Flux condition The remaining Sidewalls are by default set to the No BC boundary condition which also is treated as a Zero Flux condition e Apply Material Properties Model gt Materials The next step in defining the model is to enter the material property for the material that will be used in the model It will be defined for all the regions 1 Openthe Materials Manager dialog by selecting Model gt Materials gt Manager from the menu Click the New button to create a material Enter Soil1 for the name The Material Properties dialog will open automatically or select the new material and click Properties to open the Material Properties dialog 4 Move to the Conductivity tab Enter the k expression of 7E 08 z 5 5 m s This expression will cause the air conductivity to vary with depth z 6 Press OK on the Materials Manager dialog to close both dialogs Each region will cut throug
6. anager Standard finite element files written out for visualization in ACUMESH or for inputting to other finite element packages PLOT MANAGER Model gt Reporting gt Plot Manager The Plot Manager dialog is first opened to display appropriate solver graphs There are many plot types that can be specified to visualize the results of the model A few will be generated for this tutorial example model including a plot of the pressure contours solution mesh and gradient vectors 1 o ON i 2 oo 10 Open the Plot Manager dialog by selecting Model gt Reporting gt Plot Manager from the menu The toolbar at the bottom left of the dialog contains a button for each plot type Click on the Contour button to begin adding the first contour plot The Plot Properties dialog will open Enter the title air pressure Select ua as the variable to plot from the drop down Move to the Projection tab Select Plane Projection option Select Y from the Coordinate Direction drop down Enter 50 in the Coordinate field This will generate a 2D slice at y 50m on which the air pressures will be plotted Click OK to close the dialog and add the plot to the list Repeat these steps 2 to 9 to create the remaining plots Note that the Mesh plot does not require entry of a variable 11 Click OK to close the Plot Manager and return to the workspace Hox Plots Point Area Min Max Flux Sections Boundary Flux Surface Flux Other
7. at the beginning of this tutorial NOTE If a mistake was made entering the coordinate points for a shape edit the shape using the Region Properties dialog menu item Model gt Geometry gt Region Properties Please also see the following sections in the user s manual to undo changes move a point move multiple points delete points or subdivide a line segment e Define the SiltRegion 6 Ensure that SiltRegion is current in the region selector 7 Select Draw gt Geometry gt Region Polygon from the menu 8 Move the cursor near 0 28 in the drawing space and left click 9 To select the point as part of the shape left click on the point 10 Now move the cursor near 50 28 and left click on the point A line is now drawn from 0 28 to 50 28 11 Repeat the process for the rest of the points in the region 12 For the final point move the cursor near the point 0 26 and double click on the point to finish the shape A line is now drawn from 50 26 to 0 26 and the shape is automatically finished by SVAIRFLOW by drawing a line from 0 26 back to the start point 0 0 NOTE At times it may be tricky to snap to a grid point that is near a line defined for a region Turn the object snap off by clicking on OSNAP in the status bar to alleviate this problem c Specify Boundary Conditions Model gt Boundaries Boundary conditions must be applied to region points Once a boundary condition is applied to a boun
8. at the left click procedure 6 For the last point 50 70 double click on the point to finish the shape A line is now drawn from 70 70 to 50 70 and the shape is automatically finished by SVAIRFLOW by drawing a line from 50 70 back to the start point 50 50 NOTE Select a shape with the mouse and select Edit gt Delete from the menu if a mistake was made entering the coordinate points for a shape This will remove the entire shape from the region To edit the shape use the Region Properties dialog e Define the Basement In the instructions for defining the Outer shape the command line was used To draw the SOILVISION SYSTEMS UTD A Three Dimensional Example Model 16 of 22 Basement region the instructions below explain the use of the drawing tool to create the Basement shape 10 11 Select Model gt Geometry gt Regions from the menu Select the Basement region and click the Properties button Click the New Polygon button Enter the region points as shown in the above table Click OK to save the region geometry and close the Region Properties dialog e Define the Crack Follow the above method to define the Crack shape referring to the table of points above After all the region geometry has been entered it will appear like the diagram at the beginning of this tutorial This model consists of three surfaces defined by constant elevations By default every model initially has two surfaces e Define Surface 1 Th
9. book Model SingleWellwSilt Minimum authorization required STUDENT Model Description and Geometry 55 Pressure Boundary 101 kPa 24 50 26 50 24 35 1 26 35 Pressure Boundary 121 kPa Y m X m Material Properties Sand air conductivity ka 2 18E 04 m s Silt air conductivity ka 2 18E 05 m s 2 1 Model Setup In order to set up the model described in the preceding section the following steps will be required The steps fall under the general categories of a Create model b Enter geometry SOILVISION SYSTEMS LTD A Two Dimensional Example Model 6 of 22 Specify boundary conditions Apply material properties Specify model output Run model ao m gt oa94 Visualize results a Create Model The following steps are required to create the model 1 Open the SVOFFICE Manager dialog Press the Clear Search button if enabled 3 Create a new project called UserTutorial by pressing the New button next to the list of projects If the project is already present select it 4 Create a new model called User_SingleWellwSilt by pressing the New button next to the list of models 5 Select the following Application SVAIRFLOW System 2D Vertical Type Steady State Units Metric Time Units Seconds s 7 Click on the World Coordinate System tab on the Create New Model dialog Enter the World Coordinates System coordinates shown below into the dialog x minimum 5 x maximum 55 y min
10. dary point the starting point is defined for that particular boundary condition The boundary condition will then extend over subsequent line segments around the edge of the region in the direction in which the region shape was originally entered Boundary conditions remain in effect around a shape until re defined The user cannot define two different boundary conditions over the same line segment More information on boundary conditions can be found in Menu System gt Model Menu gt SOILVISION SYSTEMS LTD A Two Dimensional Example Model 9 of 22 Boundary Conditions gt 2D Boundary Conditions in your User s Manual Now that all of the regions and the model geometry have been successfully defined the next step is to specify the boundary conditions An atmospheric pressure of 101 kPa is applied at the ground surface The injection well pressure is 121 kPa x v Boundary Condition Constant o fo zem so o comme OS so 26 Comte so 28 Comte oo o 26 so eom SO SSS as o come SSS oa o coe SSS Coa zero ma o f so zom SS o 28 Continue SSS Co 26 Continue The steps for specifying the boundary conditions are as follows e SandyRegion Select the SandyRegion region in the drawing space 2 From the menu select Model gt Boundaries gt Boundary Conditions The Boundary Conditions dialog will open The user may also press the pm toolbar button to open the boundary condi
11. efined as a set of coordinates Model Geometry can also be imported from either DXF files or from existing models SOILVISION SYSTEMS UTD A Three Dimensional Example Model 15 of 22 This model will be defined by three regions which are named Outer Basement and Crack To add the necessary regions follow these steps 1 ae Open the Regions dialog by selecting Model gt Geometry gt Regions from the menu Change the first region name from Ri to Outer To do this highlight the name and type new text Press the New button to add a second region Change the name of the second region to Basement Press the New button to add a third region Change the name of the third region to Crack Click OK to close the dialog The shapes that define each region will now be created Note that when drawing geometry shapes the region that is current in the region selector is the region the geometry will be added to The Region Selector is at the top of the workspace Outer Basement e Define the Outer region 1 Ensure the Outer region is current in the region selector 2 Select Draw gt Geometry gt Polygon Region from the menu 3 Move the cursor near 50 50 in the drawing space 4 When the cursor is near the point click the left mouse button The cursor should automatically snap to the point 50 50 as long as the SNAP and GRID options in the status bar are both bold 5 Now move the cursor to subsequent region points and repe
12. es a special role in guiding the first time users of the SVAIRFLOW software through a typical example problem The example is typical in the sense that it is not too rigorous on one hand and not too simple on the other hand The Tutorial Manual serves as a guide by i assisting the user with the input of data necessary to solve the boundary value problem ii explaining the relevance of the solution from an engineering standpoint and iii assisting with the visualization of the computer output An attempt has been made to ascertain and respond to questions most likely to be asked by first time users of SVAIRFLOW It should be noted that some models presented in this manual can be run with the free STUDENT authorization of the software Other models require a purchased STANDARD or PROFESSIONAL authorization level to run through the tutorial The authorization level required for each model is specified at the start of the model SOILVISION SYSTEMS LTD A Two Dimensional Example Model 5 of 22 2 A Two Dimensional Example Model The following example will introduce some of the features included in SVAIRFLOW and will set up a model of a simple air injection well The purpose of this model is to determine the effects of a silt layer on the air pressure contours around an injection well The well dimensions have been exaggerated for simplicity and viewing purposes The model dimensions and material properties are provided below Project USMEP_Text
13. g in the USB security key Go to the File gt Authorization dialog on the SVOFFICE Manager Software should display full authorization If not it means that the security codes provided by SoilVision Systems at the time of purchase have not yet been entered Please see the Authorization section of the SVOFFICE User s Manual for instructions on entering these codes The following steps are required to create the model 1 Openthe SVOFFICE Manager dialog 2 Select the project called UserTutorial by pressing the New button next to the list of projects 3 Create a new model called UserFloorLeak by pressing the New button next to the list of models The new model will be automatically added under the recently created UserTutorial project The first step in defining the model is to specify the settings that will be used for the model To open the Settings dialog select Model gt Settingsin the workspace menu Select the following settings Application SVAIRFLOW System 3D Vertical Type Steady State Units Metric Time Units Seconds s 4 Access the World Coordinate System tab on the Create New Mode dialog 5 Enter the World Coordinates System coordinates shown below into the dialog x minimum 45 x maximum 75 y minimum 45 y maximum 75 6 Click OK to close the dialog b Enter Geometry Model gt Geometry Model geometry is defined as a set of regions and a series of layers Geometry can be either drawn by the user or d
14. h all the layers in a model creating a separate block on each layer Each block can be assigned a soil or be left as void A void area is essentially air space In this model all blocks will be assigned a material Select Outer in the Region Selector 2 Select Model gt Materials gt Material Layers from the menu to open the Material Layers dialog 3 Select the Soil1 material from the drop down for Layer 1 Select the Soili material from the drop down for Layer 2 5 Select Basement in the Region Selector using the right arrow at the top of the Material Layers dialog 6 Select Model gt Materials gt Material Layers from the menu to open the Material Layers dialog Select the Soil1 material from the drop down for Layer 1 8 Select Crack in the Region Selector 9 Select Model gt Materials gt Material Layers from the menu to open the Material Layers dialog 10 Select the Soil1 material from the drop down for Layer 1 11 Close the dialog using the OK button f Specify Model Output Two levels of output may be specified i output graphs contour plots fluxes etc which are displayed during model solution and ii output which is written to a standard finite element file for viewing with ACUMESH software Output is specified in the following two dialogs in the software SOILVISION SYSTEMS UTD A Three Dimensional Example Model 19 of 22 i Plot Manager Output displayed during model solution ii Output M
15. icrosoft Corporation SoilVision is a registered trademark of SoilVision Systems Ltd SVOFFICE is a trademark of SoilVision Systems Ltd SVFLUX is a trademark of SoilVision Systems Ltd CHEM FLUX is a trademark of SoilVision Systems Ltd SVAIRFLOW is a trademark of SoilVision Systems Ltd SVHEAT is a trademark of SoilVision Systems Ltd SVSOLID is a trademark of SoilVision Systems Ltd SVSLOPE is a registered trademark of SoilVision Systems Ltd ACUM ESH is a trademark of SoilVision Systems Ltd FlexPDE is a registered trademark of PDE Solutions Inc Copyright 2013 by SoilVision Systems Ltd Saskatoon Saskatchewan Canada ALL RIGHTS RESERVED Printed in Canada Last Updated May 20 2013 SOILVISION SYSTEMS UTD Table of Contents 3 of 22 LintroduUcian esas 4 2 A Two Dimensional Example Model sssscssssssscsssscscssssscsesscsesesecsesassecaeseesesaesessesaesesaesensesatsesseseees 5 ZIMOJEESET D rrna aa E aE UT O E sy aus Aalto 5 2 2 Results and DISCUSSION mrar nena a a AEEA A ATO OAE 12 3 A Three Dimensional Example Model ssssssssosssesesessssessessssesesosseesesesosesescscsesesesessseseoesssnssesosssssese 13 NE RN NON 13 3 2 Results a Md DISCUSS Mineria dt creais iaa ra anadir Eno 20 22 ALRETETENCES daksina bachechasiechuaiealeciusdecdecdusasdncsassbcansoactesbedoncndoncbesendeccesdosensdbe SOILVISION SYSTEMS UTD Introduction 4 of 22 1 Introduction The Tutorial Manual serv
16. imum 5 y maximum 55 9 Click OK to close the dialog The workspace grid spacing needs to be set to aid in defining region shapes The SandyRegion region of the model has coordinates of a precision of 0 5m In order to effectively draw geometry with this precision using the mouse the grid spacing must be set to a maximum of 0 5 1 The Options dialog will appear Enter 0 5 for both the Horizontal and Vertical spacing under the Grid Spacing tab 2 Click OK to close the dialog b Enter Geometry Model gt Geometry Model geometry is defined as a set of regions Geometry can be either drawn by the user or defined as a set of coordinates Model Geometry can also be imported from either DXF files or from existing models Each region will have separate material properties To add the necessary region points follow these steps SOILVISION SYSTEMS LTD A Two Dimensional Example Model 7 of 22 1 Open the Regions dialog by selecting Model gt Geometry gt Regions from the menu 2 Change the first region name from R1 to SandyRegion To do this highlight R1 and type the new text 3 Press the New button to add a second region Change the name of the second region to SiltRegion 5 Click OK to close the dialog The shapes that define each material region will now be created Note that when drawing geometry shapes the region that is current in the region selector is the region the geometry will be added to The Region Selector is
17. is surface will be defined by providing a constant elevation Select Surface 1 in the Surface Selector located at the top of the workspace Select Model gt Geometry gt Surface Properties in the menu to open the Surface Properties dialog For the Surface Definition option select Constant Enter a Surface Constant of 0 Click OK to close the dialog e Define Surface 2 This surface will be defined by providing a constant elevation 6 7 8 9 10 Select Surface 2 in the Surface Selector located at the top of the workspace Select Model gt Geometry gt Surface Properties in the menu to open the Surface Properties dialog For the Surface Definition option select Constant Enter a Surface Constant of 4 Click OK to close the dialog e Insert and Define Surface 3 Surface 3 is not present by default and must be created using the Insert Surface dialog 1 Open the Surfaces dialog by selecting Model gt Geometry gt Surfaces from the menu Press the New button to add surfaces 1 is selected in the Number of New Surfaces dialog and press OK to add Surface 3 and close the dialog Click OK to close the Insert Surface dialog Select Surface 3 in the Surfaces dialog and click the Properties button For the Surface Definition option select Constant SOILVISION SYSTEMS UTD A Three Dimensional Example Model 17 of 22 6 7 Enter a Surface Constant of 5 5 Click OK to close the dialog c Specify I
18. ized using ACUMESH It can be seen from the following results that the silt layer inhibits the flow of air Lateral flow in the air is therefore unlikely in this instance Pore Air Pressure ua kPa SOILVISION SYSTEMS LTD A Three Dimensional Example Model 13 of 22 3 A Three Dimensional Example Model The following example will introduce you to the three dimensional SVAIRFLOW modeling environment The purpose of this model is to calculate the quantity of air flow into the basement A 1 cm crack exists between the floor slab and the basement walls The intent of the current model is to calculate the volume of contaminated air which will enter the basement in these specific conditions Project Foundations Model FloorLeak Minimum authorization required STANDARD Model Description and Geometry Pressure 101 3 kPa Pressure 101 2 kPa 3 1 Model Setup In order to set up the model described in the preceding section the following steps will be required The steps fall under the general categories of Create model Enter geometry Specify initial conditions 0 0 504 Specify boundary conditions SOILVISION SYSTEMS UTD A Three Dimensional Example Model 14 of 22 Apply material properties Specify model output Run model 0060140 Visualize results a Create Model Since FULL authorization is required for this tutorial the user must perform the following steps to ensure full authorization is activated Plu
19. nitial Conditions Mode gt Initial Conditions A temperature of 20 C is required Oe ee NS Select Model gt Initial Conditions gt Settings from the menu Move to the Temperature tab Select the Constant Expression Temperature Option Enter a temperature value of 20 Click OK to close the Settings dialog d Specify Boundary Conditions Model gt Boundaries More information on boundary conditions can be found in Menu System gt Model Menu gt Boundary Conditions in your User s Manual Now that all of the regions surfaces and the materials have been successfully defined the next step is to specify the boundary conditions on the region shapes The ground surface will be set at a pressure of 101 3 kPa while the basement will be set at a pressure of 101 2 kPa The steps for specifying the boundary conditions include Select the Outer region in the drawing space Select Surface 3 in the surface selector From the menu select Model gt Boundaries gt Boundary Conditions The boundary conditions dialog will open and display the boundary conditions for Surface 3 Move to the Surface Boundary Conditions tab From the Boundary Condition drop down select a Pressure Expression boundary condition This will cause the Expression box to be enabled In the Expression box enter a pressure of 101 3 Click the OK button to save the boundary condition to the list Now to set the Crack regions Surface 2 Boundary Condition to
20. radient causing flow of air into the basement The results of the flux section indicate the steady state flow of air of 4 80e 7 m3 second equivalent to 0 0415 m3 day is entering the basement SOILVISION SYSTEMS LTD References 22 of 4 References FlexPDE 6 x Reference Manual 2007 PDE Solutions Inc Spokane Valley WA 99206 22
21. the dialog which appears Press OK and the Material Properties dialog will open automatically NOTE When a new material is created you can specify the display color of the material using the Fill Color box on the Material Properties menu Any region that has a material assigned to it will display that material s fill color 5 Under the Conductivity tab select the Constant air conductivity option from the drop down 6 Enter the k value of 2 18E 04 m s Click OK to close Repeat these steps to create the silt material refer to the data provided in the A Two Dimensional Example Model section at the beginning of this tutorial 9 Press OK to close the Materials Manager dialog 10 Open the Regions dialog by selecting Model gt Geometry gt Regions from the menu 11 Select the Sand for the SandyRegion using the material drop down 12 Select the Silt for the SiltRegion using the material drop down 13 Press the OK button to accept the changes and close the Regions dialog e Specify Model Output Two levels of output may be specified i output graphs contour plots fluxes etc which are displayed during model solution and ii output which is written to a standard finite element file for viewing with ACUMESH software Output is specified in the following two dialogs in the software i Plot Manager Output displayed during model solution ii Output Manager Standard finite element files written out for visualiza
22. tion in ACUMESH or for inputting to other finite element packages PLOT MANAGER Model gt Reporting gt Plot Manager The Plot Manager dialog is first opened to display appropriate solver graphs Boundary Flux specifications are used to report the rate of flow across a boundary for a steady state analysis and the rate and volume of flow moving across a boundary in a transient analysis Boundary Names must be assigned using the Region Properties dialog and then Reports selected using the Boundary Flux dialog SOILVISION SYSTEMS LTD A Two Dimensional Example Model 11 of 22 Seco UN epa Click on the SandyRegion region shape in the workspace with the mouse Select Model gt Boundaries gt Boundary Conditions from the menu to open the Boundary Conditions dialog By default the point 0 0 has a Boundary Name defined Select the point 26 35 Enter the boundary name WellScreen in the Boundary Name textbox Select point 24 35 from the list Enter End as the boundary name Press OK to close the dialog Once the Boundary Names have been defined the plots can be defined 1 OY Po 2 Select Model gt Reporting gt Plot Manager from the menu to open the Plot Manager dialog Select the Boundary Flux tab and press the Report button found in the Add New Plot groupbox Select WellScreen as the boundary and enter WellScreen as the title Select the Output Options tab and click the Display and Save PG6 solver option
23. tions dialog Select the point 0 0 Select Zero Flux from the Boundary Condition drop down Select the point 50 0 from the list Select Continue condition from the drop down Apply the remaining boundary conditions referring to the list above Click the OK button to close the dialog So NAMA Ww NOTE The Pressure Constant boundary condition for the point 26 35 becomes the boundary condition for the following line segments that have a Continue boundary condition until a new boundary condition is specified In this case the line segments from 26 35 to 24 30 are all given a Pressure Constant boundary condition e SiltRegion By default a No BC boundary condition is set for all line segments in the SiltRegion region and this boundary condition is appropriate so no changes are required d Apply Material Properties Model gt Materials SOILVISION SYSTEMS UTD A Two Dimensional Example Model 10 of 22 The next step in defining the model is to enter the material properties for the two materials that will be used in the model A sand is defined for the majority of the model and a silt layer extends horizontally through the middle This section will provide instructions on creating the sand material Repeat the process to add the silt material 1 Open the Materials dialog by selecting Model gt Materials gt Manager from the menu Click the New button to create a new material 3 Enter Sand for the material name in
24. utton for each output file type Press the SVAirFlow button to create a new transfer file 3 Enter the title uaTransfer Click OK to close the dialog and add the output file to the list 5 Click OK to close the Output Manager and return to the workspace g Run Model Solve gt Analyze The next step is to analyze the model Select Solve gt Analyze from the menu This action will write the descriptor file and open the SVAIRFLOW solver The solver will automatically begin solving the model When the Regrid Limit message appears click No and the solver will begin generating the plots h Visualize Results Window AcuMesh Once you have analyzed the model the output plots can be visualized using ACUMESH In order to view plots in ACUMESH select Window gt ACUMESH from the menu Plots can visualized by selecting the desired process under Plots in the menu 3 2 Results and Discussion After the model has finished solving the results will be displayed in the dialog of thumbnail plots within the SVAIRFLOW solver These plots can also be examined in details using ACUMESH This section will give a brief analysis for each plot that was generated e Solution Mesh SOILVISION SYSTEMS UTD A Three Dimensional Example Model 21 of 22 The Mesh plot displays the finite element mesh generated by the solver The mesh is automatically refined in critical areas e Pressure Contours ONOMaA Wn The plot indicates a pressure g
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