1 SVAirFlow Tutorial Manual
Contents
1. 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 o2. If the project is already present select it 4 Create a new model called User_SingleWellwClay by pressing the New button next to the list of models The new model will be automatically added under the recently created UserTutorial project 5 Select the following e SVFlux for Application e 2D for System e Steady State for Type e Metric for Units and e Seconds s for Time Units Before entering any model geometry it is best to set the World Coordinate System to ensure that the model will fit in the drawing space The user may access the World Coordinates System dialog by selecting the World Coordinates System tab on the Create New Model dialog Access the World Coordinate System tab on the Create New Model dialog 2 Enter the World Coordinates System coordinates shown below into the dialog x minimum 5 y minimum 5 x maximum 55 y maximum 55 3 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 View Options dialog should automatically appear 2 Enter 0 5 for both the horizontal and vertical spacing 3 Click OK to close the dialog b Enter Geometry This model will be divided into two regions which are named SandyRegion and ClayRegion Each regio
3. Conditions The boundary conditions dialog will open By default the first boundary segment will be given a Zero Flux condition The user may also press the it toolbar button Select Pressure Expression from the Boundary Condition drop down Select the point 0 0 Enter 101 3 in the Expression field Select the point 50 0 from the list Select the Zero Flux condition from the drop down Apply the remaining boundary conditions referring to the list above Click the OK button to close the dialog O Ol A a NOTE The Pressure Expression boundary condition for the point 27 5 50 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 27 5 50 to 22 5 35 are all given a zero flux boundary condition e ClayRegion By default a Zero Flux boundary condition is set for the ClayRegion region and this boundary condition is appropriate so no specifications are required e Apply Material Properties 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 clay layer extends horizontally through the middle This section will provide instructions on creating the sand material Repeat the process to add the clay material 1 Open the Materials dialog by selecting Model gt Materials gt Mana
4. region is current in the region selector Select Draw gt Model Geometry gt Polygon Region from the menu Move the cursor near 50 50 in the drawing space 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 Now move the cursor to subsequent region points and repeat the left click procedure 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 SOILVISION SYSTEMS LTD SV AirFlow Tutorial Manual 23 of 25 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 Define the Basement In the instructions for defining the Outer shape the command line was used To draw the Basement region the instructions below explain the use of the drawing tool to create the Basement shape Select Model gt Geometry gt Regions from the menu Select the Basement region and click the Properties button 9 Click the New Polygon button 10 Enter the region points as shown in the above table 11 Click OK to save the region geometry and close the Regi
5. the general categories of Create model Enter geometry Specify boundary conditions E Apply material properties SOILVISION SYSTEMS LTD SV AirFlow Tutorial Manual 17 of 25 5 Specify model output 6 Run model 7 Visualize results 1 Create Model The first step in creating the stochastic model is to save a copy of the example model created in section 1 This is accomplished through the following steps 1 Open the Tutorial gt SingleWellwClay model 2 Select File gt Save Model As 3 Type the name SingleWellwClaySto and click OK Now a new model has been created and loaded into the workspace that will be modified to include stochastic analysis The second step is to describe the number of stages runs that will be used in the analysis Stages are controlled in SVAIRFLOW by opening the Model gt FEM Options dialog The STAGES field should be set to 50 under the Stage Controls area of the dialog Click Yes for the warning message and then close the FEM Options dialog 2 Enter Geometry The geometry has already been specified for this model 3 Specify Boundary Conditions The boundary conditions have already been specified for this model 4 Apply Material Properties The next step that must occur is that the k value will be staged In this example the parameter will be set to have a mean value of 5 and a standard deviation of 2 This staging is accomplished through the following process Select Model gt Mat
6. A E and Hult M F 1991 Evaluation of Unsaturated Zone Air Permeability Through Pneumatic Tests Water Resources Research 27 10 2605 2617 Ba Te 2004 Flow of Air phase in Soils and Its Application in Emergent Stabilization of Soil Slopes Hong Kong University of Science and Technology Hong Kong Fredlund D G and Rahardjo H 1993 Soil Mechanics for Unsaturated Soils John Wiley 8 Sons New York FlexPDE 3 x Reference Manual 1999 PDE Solutions Inc Antioch CA 94509 FlexPDE 4 x Reference Manual 2004 PDE Solutions Inc Antioch CA 94509 SOILVISION SYSTEMS UTD This page is left blank intentionally SV AirFlow Tutorial Manual 30 of 25
7. 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 visualization in ACUMESH or for inputting to other finite element packages PLOTMANAGER 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 pe OL aes 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 27 5 35 Enter the boundary name WellScreen Select point 22 5 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 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 Select WellScreen as the boundary and enter Wel Screen as the title Select the Output Options tab and click the checkbox beside
8. Draw gt Model 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 SOILVISION SYSTEMS LTD SV AirFlow Tutorial Manual 11 of 25 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 Initial Conditions A temperature of 15 C is required for the specification of initial conditions Initial conditions can be specified through the following steps 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 15 A ee Click OK to close the Initial Conditions dialog d Specify Boundary Conditions Boundary conditions must be applied to region points Once a boundary condition is applied to a boundary poin
9. IRFLOW is the basic building block for a model A region represents both a physical portion of material being modeled and a visualization area in the SVAIRFLOW CAD workspace A region will have a set of geometric shapes that define its material boundaries Also other modeling objects including features flux sections text and line art can be defined on any given region This model will be defined by three regions which are named Outer Basement and Crack To add the necessary regions follow these steps SOILVISION SYSTEMS UTD 1 O TOY AO SV AirFlow Tutorial Manual 22 of 25 Open the regions dialog by selecting Model gt Geometry gt Regions from the menu Change the first region name from R1 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 Crack X Y X Y X Y 50 50 50 50 50 50 70 50 59 8 50 59 7 50 70 70 59 8 59 8 59 7 59 7 50 70 50 59 8 50 59 7 e Define the Outer region pow Ne Ensure the Outer
10. PLOT SOILVISION SYSTEMS UTD SV AirFlow Tutorial Manual 14 of 25 5 8 9 10 11 12 13 14 15 16 17 18 Press OK to return to the Plot Manager dialog Press the History Plot button on the Boundary Flux tab Select We Screen as the boundary enter BF WellScreen X Component of Flow as the title and select X Component of Flow as the variable Select the Output Options tab and ensure both checkboxes are unchecked Press OK to return to the Plot Manager dialog Press the History Plot button on the Boundary Flux tab Select We Screen as the boundary enter BF WellScreen Y Component of Flow as the title and select Y Component of Flow as the variable Select the Output Options tab and ensure both checkboxes are unchecked Press OK to return to the Plot Manager dialog Press the History Plot button on the Boundary Flux tab Select Wel Screen as the boundary enter BF WellScreen Normal Flow as the title and select Normal Flow as the variable Select the Output Options tab and ensure both checkboxes are unchecked 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 press
11. cluded 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 clay 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 BoreHolePumping Model SingleWellwClay Minimum authorization required STUDENT SOILVISION SYSTEMS LTD SV AirFlow Tutorial Manual 7 of 25 Model Description 50 A 22 5 50 7 5 50 gt 25 20 15 10 5 Pressure Boundary 101 3 5 0 5 10 15 20 25 30 35 4 45 50 55 Material Properties Sand air conductivity k 2 18E 04 m s Clay air conductivity k 2 18E 05 m s 1 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 Create model Enter geometry Specify initial conditions Specify boundary conditions Apply material properties Specify model output aomnpapgy Run model SOILVISION SYSTEMS LTD SV AirFlow Tutorial Manual 8 of 25 h Visualize results a Create Model The following steps are required to create the model Open the SVOFFICE Manager dialog 2 Select ALL under the Applications combo box and ALL for the Model Origin combo box 3 Create a new project called UserTutorial by pressing the New button next to the list of projects
12. erials gt Manager to open the list of current materials Select the ClayRegion material and click the Properties button Click the Stage Parameters button located in the lower left of the dialog Select the k parameter and click the Include button Click the Stage Values button Click the Increment Stage Values button Enter a start of 0 0000001 and an increment of 0 001 and click the OK button A list of 50 generated values will now be displayed in the Stage Values list box E ee Press OK on all remaining dialogs to close them The parameter has now been staged SOILVISION SYSTEMS LTD SV AirFlow Tutorial Manual 18 of 25 5 Specify Model Output Model Outputs have already been defined for this model 6 Run Model Selecting Solve gt Analyze from the menu will initiate model solution Attention should be directed to the stage display in the finite element solver Once a particular stage is complete the next stage will automatically be initiated The differential flows through the sandy material and clay layer may be seen in the gradient plot as the air conductivity in the clay layer varies 7 Visualize Results The visual results for the current model may be examined by selecting the View gt ACUMESH menu option 1 3 2 Results amp Discussion Contour plots of the completed model at stages 1 and 20 can be seen below All outputs previously specified can now be visualized using ACUMESH Contour Plo
13. f Microsoft Corporation Soil Vision is a registered trademark of SoilVision Systems Ltd SVOFFICE is a trademark of SoilVision Systems Ltd SVFLUX is a trademark of SoilVision Systems Ltd CHEMFLUX is a trademark of Soil Vision 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 SVDYNAMIC is a trademark of SoilVision Systems Ltd ACUMESH is a trademark of Soil Vision Systems Ltd FlexPDE is a registered trademark of PDE Solutions Inc Copyright 2008 by Soil Vision Systems Ltd Saskatoon Saskatchewan Canada ALLRIGHTS RESERVED Printed in Canada SOILVISION SYSTEMS LTD Table of Contents ee 1 SVAirFlow Tutorial Manual s222 46 seitecel cient iti isl beets tee Mak 1 1 INtrodUctiON iii al ne bd aia eis ataca Peres 12 A Two Dimensional Example Model eens DO A SOILVISION SYSTEMS LTD SV AirFlow Tutorial Manual 4 of 25 1 SVAirFlow Tutorial Manual SVAIRFLOW 2D 3D Airflow Modeling Software Tutorial Manual Written by Robert Thode B Sc G E Edited by Murray Fredlund Ph D SoilVision Systems Ltd Saskatoon Saskatchewan Canada SOILVISION SYSTEMS LTD SV AirFlow Tutorial Manual 5 of 25 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 agree
14. g Model gt Reporting gt Plot Manager from the menu 14 Select the Surface Flux tab and press the Summary Plot button from the Add New Plot area 15 The Plot Properties Surface Flux dialog will appear Select Surface 2 from the Surface drop down 16 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 OUTPUTMANAGER 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 button for each output file type Click on the ACUMESH button to begin adding the output file The Output File Properties dialog will open 3 Enter the title Basement2 4 Click OK to close the dialog and add the output file to the list 5 Press the Transfer File button to create a new transfer file 6 Enter the title uaTransfer 7 Select the variable ua in the available variables list SOILVISION SYSTEMS LTD SV AirFlow Tutorial Manual 28 of 25 8 Press the Single Right Arrow button 9 Click OK to close the dialog and add the output file to the list 10 Click OK to close the Output Manager and return to the workspace g Run Model The next step is to ana
15. ger from the menu 2 Click the New button to create a material Enter Sand for the material name in the dialog which appears Press OK to close the dialog 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 Move to the Conductivity tab and select Constant Expression from the drop down 6 Enter the k value of 2 18E 04 m s SOILVISION SYSTEMS LTD SV AirFlow Tutorial Manual 13 of 25 10 11 12 13 Click OK to close the Material Properties dialog Repeat these steps to create the clay material refer to the data provided in the A Two Dimensional Example Model section at the beginning of this tutorial Press OK to close the Materials Manager dialog Open the Regions dialog by selecting Model gt Geometry gt Regions from the menu Select the Sand Material for the SandySoil using the material drop down Select the Clay Material for the ClayLayer using the material drop down Press the OK button to accept the changes made and close the Regions dialog 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
16. in 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 Select the PLOT output option 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 11 Repeat these steps 2 to 10 to create the remaining plots Note that the Mesh plot does not require entry of a variable Standard finite element files written out for visualization in AcuMesh SOILVISION SYSTEMS UTD SV AirFlow Tutorial Manual 27 of 25 12 Click OK to close the Plot Manager and return to the workspace Y Plot Manager Plots Point Area Volume Flux Sections Boundary Flux Surface Flux Other PLOT Yes Yes Yes Projection Y 50 Y 50 3D Title Restriction ail pressure vectors Mesh Variable 6 2 ua fluxax fluxaz Add New Plot pa Copy Delete Properties Multiple Update 2 Plot Settings Add Defaults Default Plot 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 BasementlIn region Follow these steps to define this 13 Open the Plot Manager dialog by selectin
17. ing the Default Plots button W Plot Manager Plots Point Area Volume Flux Sections Boundary Flux Other Title Variable Restriction KG Air Pressure Z Add New Plot Copy Delete Properties Multiple Update 2 Peet Settings Add Defaults Default Plot OUTPUTMANAGER 1 Open the Output Manager dialog by selecting Model gt Reporting gt Output Manager from the menu The toolbar at the bottom left corner of the dialog contains a button for each output file type Click on the ACUMESH button to begin adding the output file The Output File Properties dialog will open SOILVISION SYSTEMS LTD SVAirFlow Tutorial Manual 15 of 25 3 Click OK to close the dialog and add the output file to the list 4 Click OK to close the Output Manager and return to the workspace g Run Model 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 h Visualize Results The visual results for the current model may be examined by selecting the View gt ACUMESH menu option or clicking on the ACUMESH button SN on the processes toolbar 1 2 2 Results amp Discussion A contour plot of the completed model results can be seen below All outputs previously specified can now be visualized using ACUMESH It can be seen from the following results that the clay layer inhib
18. its the flow of air Lateral flow in the air is therefore unlikely in this instance ua kPa X m 1 3 2D Stochastic Example A single run of a numerical model is often not sufficient SVAIRFLOW implements the ability to incorporate statistical uncertainty into the input of material properties This tutorial section guides the user through the setup and execution of a model implementing the stochastic or statistical features available in SVAIRFLOW The air injection well example presented in Section 1 is extended to incorporate a variation in the air conductivity k of the clay layer Instead of specifying a single value for this SOILVISION SYSTEMS UTD SV AirFlow Tutorial Manual 16 of 25 parameter an incremental analysis will be used to generate 50 runs of the same model varying the k parameter over 6 orders of magnitude Why do we want to do this In this example we want to determine the influence of the k on the difference in pressure distributions around the injection well The sensitivity of the k value may be significant in determining injection rates Project BoreHolePumping Model SingleWellwClaySto 0 50 22 5 50 27 5 50 22 5 35 27 5 35 35 PA 22 5 30 27 5 30 Pressure Boundary 102 20 5 Pressure Boundary 101 3 1 3 1 Model Setup 50 50 In order to set up the model described in the preceding section the following steps will be required The steps fall under
19. lyze 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 Once you have analyzed the model the output plots can be visualized using ACUMESH In orderto view plots in ACUMESH select Window gt ACUMESH from the menu ACUMESH will prompt you to select the Output file to view Choose ACUMESHOut dat and click OK to open this file Plots can visualized by selecting the desired process under Plots in the menu 1 4 2 Results amp 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 The Mesh plot displays the finite element mesh generated by the solver The mesh is automatically refined in critical areas SOILVISION SYSTEMS LTD SV AirFlow Tutorial Manual 29 of 25 e Pressure Contours 1 2 3 4 5 6 7 8 The plot indicates a pressure gradient 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 1 5 References Baehr
20. ment 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 models Trademarks Windows is a registered trademark of Microsoft Corporation SoilVision is a registered trademark of SoilVision Systems Ltd SVOFFICE is a trademark of SoilVision Systems Ltd CHEMFLUX is a trademark of SoilVision Systems Ltd SVFLUX is a trademark of SoilVision Systems Ltd SVHEAT is a trademark of SoilVision Systems Ltd SVAIRFLOW is a trademark of SoilVision Systems Ltd SVSOLID is a trademark
21. n to add surfaces 1 is selected in the Number of New Surfaces dialog and Place New Surfaces At The Top is the default selected so 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 Enter a Surface Constant of 5 5 Click OK to close the dialog c Specify Initial Conditions A temperature of 20 C is required A 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 OKto close the Settings dialog d Specify Boundary Conditions Boundary conditions must be applied to region points Once a boundary condition is applied to a boundary point this defines the starting point 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 may not 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 Boundary Conditions gt 2D Boundary Conditions in your User s Manual Now that all of the regions surfaces and the material
22. n will have separate material properties To add the necessary region node points follow these steps SOILVISION SYSTEMS LTD SV AirFlow Tutorial Manual 9 of 25 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 the name and type new text 3 Press the New button to add a second region Change the name of the second region to ClayRegion 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 at the top of the workspace SandyRegion ClayRegion X Y Boundary Condition X Y Boundary Condition 0 0 BN_R1_758278157 0 28 BN_ClayRegion_707530074 50 0 50 28 50 50 50 26 27 5 50 0 26 21 5 35 WellScreen 27 5 30 22 5 30 22 5 35 End 22 5 50 0 50 Geometry in the SVOFFICE software may be i typed in manually ii cut and pasted from Excel 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 snappy is turned on by clicking the Snap On at the bottom of the drawing space e Define the SandyRegion 1 Ensu
23. ning Segments are by default set to the No BC boundary condition which also is treated as a Zero Flux condition e Apply Material Properties 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 fi Open the Materials Manager dialog by selecting Model gt Materials gt Manager from the menu Click the New button to create a material Enter Soill for the name The Material Properties dialog will open automatically or select the new material and click Properties to open the Material Properties dialog 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 Press OK on the Materials Manager dialog to close both dialogs Each region will cut through 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 Select Model gt Materials gt Region Materials from the menu to open the Region Materials dialog Select the Soi 1 material from the drop down for Layer 1 SOILVISION SYSTEMS LTD SV AirFlow Tutorial Manual 26 of 25 Select the Soil1 material from the drop down for Layer 2 Select Basement in the Region Selector using the right ar
24. of SoilVision Systems Ltd SVDYNAMIC is a trademark of SoilVision Systems Ltd ACUMESH is a trademark of SoilVision Systems Ltd FlexPDE is a registered trademark of PDE Solutions Inc Copyright 2008 by SoilVision Systems Ltd Saskatoon Saskatchewan Canada ALL RIGHTS RESERVED Printed in Canada SOILVISION SYSTEMS LTD SV AirFlow Tutorial Manual 6 of 25 1 1 Introduction The Tutorial Manual serves 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 LITE 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 1 2 A Two Dimensional Example Model The following example will introduce some of the features in
25. on Properties dialog 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 Define Surface 1 This surface will be defined by providing a constant elevation 1 Select Surface 1 in the Surface Selector located at the top of the workspace 2 Select Model gt Geometry gt Surface Properties in the menu to open the Surface Properties dialog 3 For the Surface Definition option select Constant Enter a Surface Constant of 0 5 Click OK to close the dialog Define Surface 2 This surface will be defined by providing a constant elevation 6 Select Surface 2 in the Surface Selector located at the top of the workspace 7 Select Model gt Geometry gt Surface Properties in the menu to open the Surface Properties dialog 8 For the Surface Definition option select Constant 9 Enter a Surface Constant of 4 10 Click OK to close the dialog SOILVISION SYSTEMS LTD SV AirFlow Tutorial Manual 24 of 25 e Insert and Define Surface 3 Surface 3 is not present by default and must be created using the Insert Surface dialog f PON UN es 19 Open the Surfaces dialog by selecting Model gt Geometry gt Surfaces from the menu Press the New butto
26. re the SandyRegion region is current in the region selector drop down SandyRegion SandyRegion Select Draw gt Model Geometry gt Region Polygon from the menu or press the toolbar button ae 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 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 SOILVISION SYSTEMS LTD SV AirFlow Tutorial Manual 10 of 25 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 22 5 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 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 ClayRegion 6 Ensure that ClayRegion is current in the region selector ClayRegion ClayRegion Select
27. row at the top of the Region Materials dialog Select Model gt Materials gt Region Materials from the menu to open the Region Materials dialog Select the Soil1 material from the drop down for Layer 1 Select Crack in the Region Selector Select Model gt Materials gt Region Materials from the menu to open the Region Materials 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 i Plot Manager Output displayed during model solution ii Output Manager or for inputting to other finite element packages PLOTMANAGER 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 SAO ID Oa O 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 beg
28. s 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 1 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 SOILVISION SYSTEMS LTD SV AirFlow Tutorial Manual 25 of 25 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 101 2 kPa Ol aN E Select the Crack region in the drawing space Select Surface 2 from the surface drop down From the menu select Mode 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 The remaining Surfaces are by default set to the None boundary condition which is treated as a Zero Flux condition The remai
29. t at Stage 1 SOILVISION SYSTEMS LTD SV AirFlow Tutorial Manual 19 of 25 Contour Plot at Stage 20 1 4 AThree 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 FULL SOILVISION SYSTEMS LTD SV AirFlow Tutorial Manual 20 of 25 Pressure 101 3 kPa Pressure 101 2 kPa 1 4 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 c Specify initial conditions d Specify boundary conditions e Apply material properties f Specify model output g Run model h 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 SOILVISION SYSTEMS LTD SV AirFlow Tutorial Manual 21 of 25 Plug 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 tha
30. t the security codes provided by SoilVision Systems at the time of purchase have not yet been entered Please see the the Authorization section of the SVOFFICE User s Manual for instructions on entering these codes The following steps are required to create the model Open the 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 Mode gt Settings in the workspace menu Select the following settings Select 3D for System Steady State for Type Metric for Units and A Seconds for Time Units Before entering any model geometry it is best to set the World Coordinate System to ensure that the model will fit in the drawing space The user may access the World Coordinates System dialog by selecting the World Coordinates System tab on the Create New Model dialog Access the World Coordinate System tab on the Create New Model dialog 2 Enterthe World Coordinates System coordinates shown below into the dialog x mi nimum 45 y minimum 45 x maximum 75 y maximum 75 3 Click OK to close the dialog b Enter Geometry A region in SVA
31. t 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 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 2 kPa is applied at the ground surface and a pressure of 101 3 kPa is applied at the base of the model to provide a small gradient The injection well pressure is 102 kPa x Y Boundary Condition 0 0 Pressure Expression 101 3 kPa 50 0 Zero Flux 50 50 Pressure Expression 101 2 kPa 27 5 50 Zero Flux 27 5 35 Pressure Expression 102 kPa 21D 30 Continue 22 5 30 Continue 22 5 35 Zero Flux 22 5 50 Pressure Expression 101 2 kPa 0 50 Zero Flux The steps for specifying the boundary conditions are thus e SandyRegion SOILVISION SYSTEMS LTD SV AirFlow Tutorial Manual 12 of 25 Select the SandyRegion region in the drawing space 2 From the menu select Model gt Boundaries gt Boundary
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