Chemflux Tutorial Manual
Contents
1. wwwwamawanwwwamwwamawanuwanwwamwwwwwa 1 7 5 Specify Boundary Conditions Specify Plots eee eee Specify Output Files emm emen 1 9 1 Setting Time Steps iore eee eee e Neate eee e Move MEELTDIUIOEN ODE Three Dimensional Example Model Steady State SVFLUK Solution CHEMFLUX Solution Data mmm SVFLUX Gradients File ener Adding a CHEMFLUX Projectsssssscsssssicssscssscrscsascsnssssssnssnssestensesssnssasens Adding a CHEMFLUX Model rtt rtt treten Opening the Modelesceshenscciteienidudecdesdicee niue 1002222224222000 tennt Defining the Model eee en enn 2 7 1 Import SVFLUX Geometry Specify Plots nennen nenne Specify Output Elles dieere tdeo te reed 277 of C dq dq o o L L 01 C S oo N N N MN MN MN MN NB NN A HSH SH SH CF Sf c Sse c c 2 2c 2 N N a O O O O O O oco Ci TH MN NNN O O O O 28 SOILVISION SYSTEMS LTD Table of Contents 4 2 10 Analyze 2 11 Results 2 11 1 Solution Mesh 2 11 4 AcuMesh 3 References 24 24 24 25 25 26 28 SOILVISION SYSTEMS LTD A Two Dimensional Example Model 5 of 28 1 A Two Dimensional Example Model Sudicky 1989 developed the following example The model considers flow and solute transport in a heterogeneous cross section with a highly irregular flow field dispersion parameters that are small compared with the spatial discretization and a large contrast between longitudinal and transverse dispersivities Zheng and Wang 1992. 0 60 J 0 50 4 0 40 0 30 8 4 0 20 4 0 10 4 0 00 4 0 10 64 H me 4 4 2 L 0 L NA va RR T T T ET 0 50 100 150 200 250 x Examples_2DExample Cycle 129 Time 12 000 dt 0 1492 p2 Nodes 7314 Cells 3559 RMS Err 3 6e 4 Integral 57 30137 SOILVISION SYSTEMS LTD A Two Dimensional Example Model e Time 20 years ES i i L Concentration 10 4 zoom 0 0 250 10 0 30 i 0 25 0 20 0 15 8 4 F 0 10 J 0 05 1 0 00 4 0 05 6 4 z J a L 24 H 0 7 L rcp v i Lea a ERE r E oes el a 0 50 100 150 200 250 x Examples_2DExample Cycle 178 Time 20 000 dt 0 3099 p2 Nodes 12577 Cells 6140 RMS Err 3 7e 4 Integral 61 18735 SOILVISION SYSTEMS UTD A Three Dimensional Example Model 15 of 28 2 A Three Dimensional Example Model The following example will introduce you to the three dimensional model in CHEMFLUX The model will be used to investigate if contaminant from a reservoir will travel to a river channel due to advection and dispersion processes within a 400 day time period The 400 day time period was chosen as the time necessary to install a pumping well between the river channel and the reservoir The well will be used to pump contaminant from the ground to ensure the plume will not reach the river channel The example model begins with a brief description of the steady state seepage analysis completed to provide CHEMFLUX with computed seepage gradients Next a detailed set of instruction
3. Q UPP UI SOILVISION SYSTEMS LTD A Two Dimensional Example Model 8 of 28 lower left in the New box 7 Enter gradient2D as the file name Select gradx and grady then press the Add Selection button Click OK to close the dialog 9 Select Solve gt Analyze from the menu to run the model A window will pop up asking if you would like to save the model file If you would like to save the model file 99 When the model is finished the necessary gradient file will be created in the solution folder automatically by SVFLUX The file is called gradient2D trn 1 4 Adding a CHEMFLUX Project The first step in defining a model is to decide the project under which the model is going to be organized If the project is not yet included you must add the project before proceeding with the model In this case the model is placed under a project called Tutorial Follow these steps in order to add this project Access the SVOffice 2006 Manager dialog Click New in the upper right of the Projects section The Create New Project dialog is opened along with a prompt asking for a new Project Name Type Tutorial as the new Project Name and press OK De te The Project Properties dialog is where information specific to each project is stored This will include the Project Name Project Folder and Project Notes information The Project Name is the only required information needed to define a project The rest of the fields are optional T
4. CHEMFLUX 2D 3D Contaminant Transport Modeling Software Tutorial Manual Date Last Edited May 22 2007 Written by Robert Thode B Sc G E Edited by Murray Fredlund Ph D 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 User s Manual is copyrighted and all rights are reserved by Soil Vision Systems Ltd The CHEMFLUX software is a proprietary product and trade secret of SoilVision Systems The User s Manual may be reproduced or copied in whole or in part by the software licensee for use with running the software The User s 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 Win
5. This can be accessed by using the Update Method tab on the Output File Properties dialog 1 Enter a Start Time of 0 a Time Increment of 1 yr and an End Time of 20 yr Click OK to close the Output File Properties dialog and return to the workspace 3 Click OK to close the Output Manager and return to the workspace 1 10 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 CHEMFLUX solver The solver will automatically begin solving the model 1 11 Results After the model has finished solving the results will be displayed in the dialog of thumbnail plots within the CHEMFLUX solver Right click the mouse and select Maximize to enlarge any of the thumbnail plots The following is a short summary of plots illustrating the movement of the plume through the model for times of 8 years 12 years and 20 years SOILVISION SYSTEMS LTD A Two Dimensional Example Model e Time 8 years 4 Concentration 10 4 zoom 0 0 250 10 0 80 0 70 1 0 60 0 50 8 7 F 0 40 4 0 30 4 0 20 J 0 10 q 0 00 6 5 0 10 gt 4 a i 2 1 L 0 47 L ka E e T JE RR RR T T T T 0 50 100 150 200 250 X Examples 2DExample Cycle 96 Time 8 0000 dt 0 1961 p2 Nodes 6375 Cells 3068 RMS Err 2 9e 4 Integral 56 74936 The source has been shut off for 3 years e Time 12 years 4 L Concentration 10 4 zoom 0 0 250 10
6. but may be edited in CHEMFLUX SOILVISION SYSTEMS LTD A Three Dimensional Example Model 21 of 28 2 7 2 Specify Settings The next step in defining the model is to specify the settings that will be used for the model The Settings dialog will contain information about the current model System Units Time and contaminant transport processes To open the Settings dialog select Model gt Settings in the workspace menu Check Advection and Dispersion in the Processes section Enter a Start Time of 0 a Time Increment of 50 days and an End Time of 400 days Select the Advection tab Choose Import from SVFlux from the Advection Control option Click Browse Specify the file Examples_ChemFlux3D_2 grd that was generated by SVFLUX SLO eh nS It is very important that the GRD file and the geometry are obtained from the same SVFLUX model Tip In order to improve solution time for the purposes of this tutorial certain finite element options will be set The finite element mesh node limit and grid spacing will be set to generate a simpler mesh that will increase the solution time 8 Select Model gt FEM Options from the menu to open the FEM Options dialog 9 Set the NODELIMIT as 800 This is the student version maximum 10 Set the NGRID parameter to 5 This is the student version maximum 11 Press OK to close the FEM Options dialog 12 Press OK to close the Settings dialog 2 7 3 Define Material Properties The next
7. 0 Close the Soil Properties and Soil Manager dialogs Hie 1 7 4 Assign Soils to Regions A region in CHEMFLUX is the basic building block for a model A region represents both a physical portion of soil being modeled and a visualization area in the CHEMFLUX CAD workspace A region will have a set of geometric shapes that define its soil boundaries Also other modeling objects including features flux sections water tables text and line art are defined on any given region This model is divided into three regions but the same soil will be assigned to each region To specify the soil for the regions follow these steps Open the regions dialog selecting Model gt Geometry gt Regions from the menu Select Soil 1 from the drop down as the soil for Region 1 Repeat for Region 2 and Region 3 Click OK to close the dialog pers 1 7 5 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 Model M
8. boundary conditions for the remaining Region 1 segment as shown in the diagram and in the screen shot above Be sure to define a Zero Flux condition for the last point in the list 7 Press OK to exit the dialog and save the defined boundary conditions Any boundary condition becomes the boundary condition for the following line segments that have a Continue boundary condition until a new boundary condition is T i p specified 1 8 Specify Plots 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 concentration contours and water gradient vectors 1 Open the Plot Manager dialog by selecting Model gt Reporting gt Plot Manager from the menu 2 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 3 Enter the title Concentration 4 Select c as the variable to plot from the drop down 5 Select the PLOT from the Output Option tab 6 Move to the Update Method tab and enter a Start Time 0 a Time Increment 1 and an End Time 20 7 Move to the Zoom tab and enter X 100 Y 0 1 Width 100 and Height 6 6 8 Click OK to close the dialog and add the plot to the list 9 Repeat steps 2 8 to create the remaining plots Note that the Mesh plot does not require
9. entry of a variable 10 Click OK to close the Plot Manager and return to the workspace SOILVISION SYSTEMS LTD A Two Dimensional Example Model 12 of 28 Plot Manager Plots Point Area Volume Flux Sections Boundary Flux Other Title Variable Restriction Update Method Concentration c tz from by 1 to 20 Water Gradients VEY t from 0 by 5 to 20 Solution Mesh att 20 Mesh att 0 Add New Plot lt S va 22 s 82 L Delete JI Properties Multiple Update Plot Settings J Custom Plots 1 9 Specify Output Files There are four output file types that can be specified to export the results of the model One will be generated for this tutorial example model a file to output variables for advanced visualization in the AcuMesh software 1 Open the Output Manager dialog by selecting Model gt Reporting gt Output Manager from the menu 2 The toolbar at the bottom left 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 Enter the title AcuMesh Press the Select All button Press the Add Selection button Check the Write File box found under the Output Options tab Click OK to close the dialog and add the output file to the list SAU SS 1 9 4 Setting Time Steps The Output File Properties dialog also allows the user to define timesteps for the current model
10. the New button under the Models heading Enter Example3D in the Model Name box Select 3D for System Transient for Type Metric for Units and Days for Time Units Click the OK button to save the model and close the New Model dialog The new model will automatically be opened in the workspace DA Rr 09 Ea E 2 6 Opening the Model If the model was just added it will already be open in the workspace When returning to the model follow these steps to open it in the workspace Select the Tutorial project in the SVOffice 2006 Manager dialog Ensure that ChemFlux is selected in the Application drop down Select Example3D from the Models list The model may be opened by clicking the Open button or by double clicking on the model name BeOS 2 7 Defining the Model The following section provides instructions on how to begin defining the model in the workspace 2 7 1 Import SVFLUX Geometry Geometry must be imported from SVFLUX before any other modeling can be done in CHEMFLUX Select the Model gt Geometry gt Import Geometry gt From Existing Model menu The Import Geometries menu will pop up Select the appropriate project name Examples Select the ChemFlux3D model Press the Import button Js pe The import includes any regions region shapes surfaces surface grids and elevations These parts of the model definition are fixed in CHEMFLUX World coordinate system settings and features are also imported if present
11. 5 07 36 6 18 03 FlexPDE 3 10 1 Gradients on Y 14 0 24 0 22 0 20 0 18 0 16 0 14 0 12 0 10 0 08 0 06 0 04 N 0 02 0 00 Tutorial Example3D Cycle 66 Time 400 00 dt 39 233 p2 Nodes 2683 Cells 1411 RMS Err 0 00 Gradient Vectors show both the direction and the magnitude of the flow at specific points in the model Vectors illustrate that flow is from right to left towards the river in this view with higher gradients near the reservoir SOILVISION SYSTEMS LTD A Three Dimensional Example Model 26 of 28 2 11 4 AcuMesh The following is a short summary of plots created in AcuMesh illustrating the movement of the plume through the model for times of 50 days 100 days and 400 days Note that the plume does not reach the river channel in within the 400 day time period e Time 50 days L e Time 100 days SOILVISION SYSTEMS LTD e Time 400 days A Three Dimensional Example Model 27 of 28 SOILVISION SYSTEMS LTD References 28 of 28 3 References C W Fetter 1994 Applied Hydrogeology Third Edition Prentice Hall Inc Upper Saddle River New Jersey C W Fetter 1993 Contaminant Hydrogeology MacMillan Publishing Company New York New York D G Fredlund and H Rahardjo 1993 Soil Mechanics for Unsaturated Soils John Wiley amp Sons New York FlexPDE 3 x Reference Manual 1999 PDE Solutions Inc Antioch CA 94509 Jacob Bear 1972 Dynamics of Fluids in Porous Media Dover Publica
12. 9 Below is a description of the seepage model including model dimensions boundary conditions soil properties and the final flow regime This is followed by step by step instructions on how to enter and solve the contaminant transport model Project Name Tutorial Model Name Example2D Minimum authorization required FULL 9 6 gt 3 0 3 15 25 65 105 145 185 225 265 x It is important to note that you will be analyzing the SVFlux model before the ChemFlux model is completed 1 1 Steady State SVFLUX Solution Project Name Examples Model Name ChemFlux2D e Model Dimensions 0 833 0 125 40 6 447 40 6 393 5 375 250 Figure 1 2D example model dimensions SOILVISION SYSTEMS LTD A Two Dimensional Example Model 6 of 28 e SVFLUX Boundary Conditions Normal Flux Expression 0 1 m yr Zero Flux 5 375 m h Zero Flux Figure 2 2D example seepage boundary conditions e SVFLUX Soil Properties C Ksat 5 0e 06 m s Ksat 1 0e 04 m s ky ratio 1 0 ky ratio 1 0 Volumetric water content 0 35 Volumetric water content 0 35 A uniform volumetric water content was set by entering a soil water characteristic curve with three points 0 0001 0 351 100 0 35 and 1000 0 349 This soil water characteristic curve was used for both the soils in the model Steady state seepage solutions do not require that the soil water characteristic curves hav
13. dary conditions for Surface 1 3 Select Surface 2 from the Surface option box 4 Select Concentration Expression from the Boundary Condition combo box under the Surface Boundary Condition section This will cause the Concentration Expression box to be enabled In the Expression box enter a concentration of 1 6 Click the OK button to close the dialog e 2 8 Specify Plots 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 concentration contours solution mesh and water gradient vectors 1 Open the Plot Manager dialog by selecting Model gt Reporting gt Plot Manager from the menu SOILVISION SYSTEMS LTD A Three Dimensional Example Model 23 of 28 Plot Manager Plots Point Area Volume Flux Sections Surface Flux Other Title Variable Restriction Projection Update Method MONITOR KG Concentration c Y 214 t from 0 by 50 to 400 No Y Water Gradients vXVZ Y 214 t from by 100 to 400 No XP Solution Mesh Y 14 at t 400 No p Mesh 3D att 0 No Add New Plot kg la Z E E Delete Jl Properties JI Multiple Update 2 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 3 Enter the title Concentration 4 Select c as the variable to plot from the
14. dows is a registered trademark of Microsoft Corporation SoilVision is a registered trademark of SoilVision Systems Ltd SVFLUX is a trademark of SoilVision Systems Ltd CHEMFLUX is a trademark of SoilVision Systems Ltd SVSOLID is a trademark of SoilVision Systems Ltd SVHEAT is a trademark of SoilVision Systems Ltd ACUMESH M is a trademark of SoilVision Systems Ltd FlexPDE is a registered trademark of PDE Solutions Inc Surfer is a registered trademark of Golden Software Inc Slicer Dicer is a registered trademark of Visualogic Inc Copyright O 2007 by SoilVision Systems Ltd Saskatoon Saskatchewan Canada ALL RIGHTS RESERVED Printed in Canada SOILVISION SYSTEMS LTD Table of Contents 1A 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 1 10 Analyze 1 1 2A 2 1 2 2 2 3 2 4 2 5 2 6 2 7 2 8 2 9 2 7 2 Specify Settings 2 7 3 Define Material Properties 2 7 4 Specifying a Soil by Region and Layer 2 7 5 Specify Boundary Conditions Two Dimensional Example Model Steady State SVFLUX Solution CHEMFLUX Solution Data eee SVFLUX Gradients File teet Adding a CHEMFLUK Project Adding a CHEMFLUK Modal ee eet eO ter Opening the CHEMFLUX Modeli Defining the CHEMFLUX Model 1 7 1 Import SVFLUX Geometry 1 7 2 Specify Settings oo ccccscsecesecsessceeeeeeusecccceceeeeessecsceeeeesecseseensneeeeess 1 7 3 Define Material Properties 1 7 4 Assign Soils to Regions
15. drop down 5 Move to the Update Method tab 6 Press the Arrow to put the model times in the plot time fields 7 Move to the Projection tab 8 Select Plane Projection option 9 Select Y from the Coordinate Direction drop down 10 Enter 14 in the Coordinate field This will generate a 2D slice at Y 14m on which the concentration contours will be plotted 11 Move to the Output Options tab 12 Select the PLOT output option 13 Click OK to close the dialog and add the plot to the list 14 Repeat these steps 2 12 to create the plots shown above Note that the Mesh plot does not require entry of a variable 15 Click OK to close the Plot Manager and return to the workspace 2 9 Specify Output Files There are 4 output file types that can be specified to export the results of the model One will be generated for this tutorial example model a file to output the results to AcuMesh for advanced visualization 1 Open the Output Manager dialog by selecting selecting Model gt Reporting gt Plot Manager from the menu 2 The toolbar at the bottom left 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 Enter the title TutorialAcuMesh Select variables c vx vy and vz in the list Press the Add Selection button Make sure the Write File box contains a check mark Click OK to close the dialog and add the output fi
16. e an initial positive slope An initial positive slope is only required in transient T i p models where the soil storage will change with time e SVFLUX Flow Regime Elevation m Distance Along Flow Direction m SOILVISION SYSTEMS UTD A Two Dimensional Example Model 7 of 28 Figure 3 2D example flow regime an Note that the model is completely saturated Tip 1 2 CHEMFLUX Solution Data e CHEMFLUX Boundary Conditions Concentration 0 Concentration if t lt 5 then 1 else 0 Concentration 0 Zero Flux Zero Flux Zero Flux Figure 4 2D example CHEMFLUX boundary conditions e CHEMFLUX Soil Properties Only one soil is used for the model with these properties Longitudinal Dispersivity 0 5m Transverse Dispersivity o 0 005m Diffusion Coefficient D 0 0423m yr 1 3 SVFLUX Gradients File A gradient file generated by SVFLUX is required for this example The seepage model described above has been included in the model files distributed with the SVFLUX software To generate the necessary seepage gradient file follow these instructions Open the SVOffice 2006 software From SVOffice 2006 Manager select Examples as the Project Ensure that SVFlux is in the Application drop down Select the model name ChemFlux2D Click OK Select Model Reporting Output Manager from the menu Add a transfer file to the Output Manager by pressing the Add Transfer output file button in the
17. enu Boundary Conditions 2D Boundary Conditions in your User s Manual The next step is to specify the boundary conditions Refer to Figure 2 at the beginning of this tutorial A zero flux condition will be defined on sides and base of the model with various concentration conditions being applied to the top boundary The boundary conditions are applied to the outer Region 1 none are applied to the other 2 regions 1 Select Region 1 by going to Model gt Geometry gt Regions in the menu and clicking on Region 1 2 Press OK to close the dialog 3 From the menu select Model gt Boundaries gt Boundary Conditions The Boundary Conditions dialog will open SOILVISION SYSTEMS LTD A Two Dimensional Example Model 11 of 28 Boundaries Region Name Region 1 Select Shape Index 585083471 Y Boundary Condition Expression or Data Units ZL 250 Continue 250 Concentration Expression 0 g m 3 175 5 5 Continue 125 6 333 Continue 80 6 393 Concentration Expression if t lt 5 then 1 else 0 g m 3 40 6 447 Concentration Expression 0 g m 3 0 6 5 Flux Expression 0 g yr m Update Selected Segment Boundary Condition Flux Expression Expression 0 NOTE boundary conditions defined at a point remain in effect until re defined at a subsequent point 4 Select the point 0 0 from the list 5 From the Boundary Condition drop down select a Zero Flux boundary condition 6 Repeat these steps to define the
18. er dialog If a project named Tutorial already exists skip to the Adding a ChemFlux Model section 2 Click New in the upper right of the Projects section 3 The Create New Project dialog is opened along with a prompt asking for a new Project Name 4 Type Tutorial as the new Project Name and press OK The Project Properties dialog is where you information specific to each project is stored This will include the Project Name Location Start Date End Date Project Notes client information contractor and project engineer information The Project Name is the only required information needed to define a project The rest of the fields are optional Tip SOILVISION SYSTEMS LTD A Three Dimensional Example Model 20 of 28 The dialog is opened ready to accept information Note that once the project is defined it will be identified by the Project Name throughout the rest of the program Also CHEMFLUX does not allow you to specify two projects with the same Project Name 5 Fill out the Project Properties dialog with the desired information 6 To exit this dialog and return to Projects Models click OK The project information is automatically saved upon entry 2 5 Adding a CHEMFLUX Model Once a project has been created any number of models may be stored in it When the Projects Models dialog is opened there will be a list of the projects that have been defined In this case there is only the Tutorial project To add a model Press
19. fusion Coefficient D 0m day 2 3 SVFLUX Gradients File A gradient file generated by SVFLUX is required for this example The seepage model described above has been included in the model files distributed with the SVFLUX software To generate the necessary seepage gradient file follow these instructions Open the SVOffice 2006 software From SVOffice 2006 Manager select Examples as the Project Ensure that SVFlux is in the Application drop down Select the model name ChemFlux3D Press the Open button Select Model Reporting Output Manager from the menu Add a transfer file to the Output Manager by pressing the Add Transfer Output File button in the lower left in the New box 8 Enter gradient3D as the file name Select gradx grady and gradz and press the Add Selection button 9 Click OK to close the dialog 10 Select Solve Analyze from the menu to run the model DX ON pA de po I When the model is finished the necessary gradient file will be created in the solution folder automatically by SVFLUX The file is called gradient3D trn 2 4 Adding a CHEMFLUX Project The first step in defining a model is to decide the project under which the model is going to be organized If the project is not yet included you must add the project before proceeding with the model In this case the model is placed under a project called Tutorial Follow these steps in order to add this project 1 Access the SVOffice 2006 Manag
20. g will contain information about the current model System Units Time and contaminant transport processes To open the Settings dialog select Model gt Settings in the workspace menu Check Advection and Dispersion in the Processes box under the General tab Enter a Start Time of 0 a Time Increment of 1 yr and an End Time of 20 yr Select the Advection tab Choose Import from SVFlux from the Advection Control option Click Browse Specify the file Examples_ChemFlux2D_2 trn that was generated by SVFLUX Press OK to close the Settings dialog DEAN LS pa IS It is very important that the TRN file and the geometry are obtained from the same SVFLUX model P Tip SOILVISION SYSTEMS LTD A Two Dimensional Example Model 10 of 28 1 7 3 Define Material Properties The next step in defining the model is to enter the material properties for the single soil that will be used in the model Open the Soils dialog by selecting Model Soils Manager from the menu Click the New button to create a soil Enter Soil 1 for the soil name Double click on the new soil to open the Soil Properties dialog Move to the Dispersion tab Refer to the data provided under the ChemFlux Solution Data section at the beginning of this tutorial Enter the Longitudinal Dispersivity o 0 5m Qe Bor Enter the Transverse Dispersivity 0 005m Select Constant as the Diffusion option Enter the Diffusion Coefficient D 0 0423m yr
21. ip The dialog is opened ready to accept information It should be noted that once the project is defined it will be identified by the Project Name throughout the rest of the program Also CHEMFLUX does not allow you to specify two projects with the same Project Name 5 Fill out the Project Properties dialog with the desired information 6 To exit this dialog and return to SVOffice 2006 Manager click OK The project information is automatically saved upon entry 1 5 Adding a CHEMFLUX Model The first step in defining a model is to decide the project under which the model is going to be organized If the project is not yet included you must add the project before proceeding with the model Once a project has been created any number of models may be stored in it When the SVOffice 2006 Manager dialog is opened there will be a list of the projects that have been defined In this case there is only the Tutorial project To add a model Press the New button under the Models heading Select ChemFlux for the Application Enter Example2D in the Model Name box Select 2D for System Transient for Type Metric for Units and Years for Time Units Click the OK button to save the model and close the New Model dialog The new model will automatically added be added to the Models list Cw Mio S9 WA SOILVISION SYSTEMS LTD A Two Dimensional Example Model 9 of 28 You will notice that there is no distinction between steady state and tran
22. ir a certain distance from a river channel The water levels in the reservoir and river channel are set using head boundary conditions The level of water in the reservoir is set using a Head Expression 10 5m set on surface 2 for the reservoir region The level of water in the river channel is set using a Head Expression 7m set on the line segment extending from point 14 0 to 14 27 on surface 1 e Soil Properties LI Ed SOILVISION SYSTEMS LTD A Three Dimensional Example Model 18 of 28 There is only one soil in the saturated 3D example model despite the presence of separate colors for the two regions Two regions have been implemented in this model in order to apply the necessary boundary conditions The soil in the model has a hydraulic conductivity ksat 2 17e 01 m d ime e Flow Re Figure 7 3D Example Flow Regime Flow lines show that groundwater is flowing from the reservoir toward the adjacent river channel The presence of unsaturated soil near the surface of the model is causing water to first flow down to the saturated zone and then move toward the river channel 2 2 CHEMFLUX Solution Data e CHEMFLUX Boundary Conditions Figure 8 3D example CHEMFLUX boundary conditions SOILVISION SYSTEMS LTD A Three Dimensional Example Model 19 of 28 e CHEMFLUX Soil Properties Only one soil is used for the model with these properties Longitudinal Dispersivity o 1m Transverse Dispersivity amp 1m Dif
23. le to the list Click OK to close the Output Manager and return to the workspace COLON Un eius SOILVISION SYSTEMS LTD A Three Dimensional Example Model 24 of 28 2 10 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 CHEMFLUX solver The solver will automatically begin solving the model 2 11 Results After the model has finished solving the results will be displayed in the dialog of thumbnail plots within the CHEMFLUX solver Right click the mouse and select Maximize to enlarge any of the thumbnail plots This section will give a brief analysis for each plot that was generated 2 11 1 Solution Mesh The Mesh plot displays the finite element mesh generated by the solver The mesh is automatically refined in critical areas Right click on the plot and select Rotate to enable the rotate window SOILVISION SYSTEMS UTD A Three Dimensional Example Model 25 of 28 2 11 2 Concentration Contours 15 07 36 61803 FlexPDE 3 10 1 Concentration on Y 14 3 a SSSR S243 Seeess DRONDA A OOOoocooo oo000 LOO 0o0000o0o0o00o0o0o0o0o0o0o0o022 guco an m IT 373003277 P OL LR Ot Tutorial Example3D Cycle 66 Time 400 00 dt 39 233 p2 Nodes 2683 Cells 1411 RMS Err 0 0 Integral 114 7896 In this contour plot it can be seen the concentration is equal to 1 at the reservoir and decreases to 0 at the river 2 11 3 Flow Vectors 1
24. or Layer 1 Close the dialog using the OK button Select Reservoir in the Region Selector Select Model gt Soils gt Region Soils from the menu to open the Region Soils dialog Select the 3D Tutorial Soil soil from the drop down for Layer 1 Close the dialog using the OK button Oe OY Ut Ti X Natus 2 7 5 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 Model Menu Boundary Conditions 2D Boundary Conditions in your User s Manual The next step is to specify the boundary conditions on the region shapes The only boundary condition that is required for this model is to set a Concentration Expression condition for the reservoir region on Surface 2 The steps for specifying the boundary condition are thus 1 Select the Reservoir region in the drawing space From the menu select Model gt Boundaries gt Boundary Manager The boundary conditions dialog will open and display the boun
25. s guides the user through the creation of the 3D contaminant transport model Project Name Tutorial Model Name Example3D Minimum authorization required STUDENT It is important to note that you will be analyzing the SVFlux model before the ChemFlux model is completed 2 1 Steady State SVFLUX Solution Advection is known as the process by which solutes are transported by the bulk motion of the flowing groundwater Freeze amp Cherry 1979 The bulk motion of the flowing groundwater or seepage gradients are solved using SVFLUX SVFLUX calculates the seepage gradients and writes them to a text file The CHEMFLUX solver then reads this text file when calculating the contaminant transport solution Below is a description of the seepage model solved by SVFLUX Project Name Examples Model Name ChemFlux3D SOILVISION SYSTEMS LTD A Three Dimensional Example Model e Model Dimensions 27 bir l 10 24 Figure 5 3D Example Model Dimensions e Surface 1 Grid ara 4 0 j 0 0 14 10 0 o gj LE 14 16 0 gw 14 17 0 0 j 1 4 7 0 0 2 0 0 N A ak EM NI al 2 d 4 0 0 0 Em NE AE 0 e Surface 2 Grid 16 of 28 SOILVISION SYSTEMS LTD A Three Dimensional Example Model 17 of 28 30 30 2 75 3 75 5 Figure 6 3D Example Boundary Conditions The steady state seepage model is set up to simulate a pond or reservo
26. sient state in CHEMFLUX This is because all models are considered to be transient state Tip 1 6 Opening the CHEMFLUX Model If the model was just added it will already be open in the workspace When returning to the model follow these steps to open it in the workspace Select the Tutorial Project Ensure that ChemFlux is selected from the Application drop down Select the Example2D model The model may be opened by clicking the Open button or by double clicking on the model name Bo me 1 7 Defining the CHEMFLUX Model The following section provides instructions on how to begin defining the model in the workspace 1 7 1 Import SVFLUX Geometry Geometry must be imported from SVFLUX before any other modeling can be done in CHEMFLUX Select the Model Geometry Import Geometry From Existing Model menu The Import Geometries dialog will pop up Select the appropriate project name Examples Select the ChemFlux2D model Press the Import button Bus NI 4 The import includes any regions region shapes surfaces surface grids and elevations These parts of the model definition are fixed in CHEMFLUX World coordinate system settings and features are also imported if present but may be edited in CHEMFLUX 1 7 2 Specify Settings 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 Settings in the workspace menu The Settings dialo
27. step in defining the model is to enter the material properties for the single soil that will be used in the model Open the Soils Manager dialog by selecting Model gt Soils gt Manager from the menu Click the New Soil button to create a soil The Soil Properties dialog will open automatically Double click on the new soil to open the Soil Properties dialog Enter the information above into the appropriate fields on the Description tab Move to the Dispersion tab qva so Refer to the data provided at the beginning of this tutorial Enter the Longitudinal Dispersivity lm Enter the Transverse Dispersivity amp 1m 8 The Diffusion option is set to Constant as the gradient file specified does not contain volumetric water content which is required to define a diffusion curve 9 Enter the Diffusion Coefficient D Om day 10 Close the Soil Properties and Soil Manager dialogs 2 7 4 Specifying a Soil by Region and Layer 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 soil SOILVISION SYSTEMS LTD A Three Dimensional Example Model 22 of 28 Select Slope in the Region Selector Select Model gt Soils gt Region Soils from the menu to open the Region Soils dialog Select the 3D Tutorial Soil soil from the drop down f
28. tions Inc New York Jacob Bear 1979 Hydraulics of Groundwater McGraw Hill New York Jason S Pentland 2000 Use of a General Partial Differential Equation Solver for Solution of Heat and Mass Transfer Problems in Soils University of Saskatchewan Canada Nguyen Thi Minh Thieu 1999 Solution of Saturated Unsaturated Seepage Problems Using a General Partial Differential Equation Solver University of Saskatchewan Canada R Allan Freeze and John A Cherry 1979 Groundwater Prentice Hall Inc Englewood Cliffs New Jersey Tecplot User s Manual version 8 0 1999 Amtec Engineering Inc Bellevue WA 98009 3633
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