SVHeat Tutorial Manual
Contents
1. SVHEAT 2D 3D Geothermal Modeling Software Tutorial Manual Written by Robert Thode B Sc G E P Eng 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 SVHEAT 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 trad2. 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 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 SVHEAT SOILVISION SYSTEMS UTD 2 Heated Pipeline The following example introduces some of the basic features of SVHEAT and sets up a model of a buried pipeline The purpose of this model is to determine the effects of the heated pipeline on the frozen ground and the nearby roadway This steady state model is composed of two regions and two materials The model data and material properties are provided below Project Model Highway PipeLineTut2D Minimum authorization required STUDENT Model Description and Geometry 45 0 Y m Heated Pipeline near Roadway Heated Pipeline Materials 2D Tutorial 1 2D Tutorial 2 of Slope Region Shape 1 polygon 25 Shape 2 Circle Seam Region 105 X Y X Y X Y 0 0 Center 50 18 0 10 100 0 55 10 100 30 Radius 2 40 15 90 30 0 15 80 28 50 28 40 20 35 20 33 22 23 22 21 20 0 20 0 15 0 10 SOILVISION SYST
3. Monitor and Plot options for this Plot under the Output options tab Add a History Plot for the X flow Y flow and Normal flow variables and Repeat steps 3 to 6 for the Circle shape s boundary BN7 by default OUTPUT MANAGER Two output files will be generated for this tutorial example a file of temperatures to be used as initial conditions in a subsequent transient analysis and a dat file to view the results in 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 Enter the File Name ACUMESHOUT Click OK to close the dialog and add the output file to the list Create the temperature file by pressed the SVHEAT File button Click OK to close the dialog and add the output file to the list and Click OK to close the Output Manager and return to the workspace SL Oy ON oi O f Run Model The next step is to analyze the model Select So ve 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 g Visualize Results The visual results for the current model may be examined by selecting the View gt ACUMESH menu option 2 2 Results amp Discussion After the model has f
4. generated by the warming of the roadway is set as 200 kJ hr i e a thermal flux boundary condition The steps associated with specifying the boundary conditions are as follows e Slope Region Shape 1 Select the Slope dominant region in the drawing space 2 From the menu select Model gt Boundaries gt Boundary Conditions The boundary conditions dialog will open 3 Select point 0 0 from the list From the Boundary Condition drop down menu select a Temperature Expression boundary condition This will cause the Temperature Expression box to be enabled In the Constant Expression box enter a temperature of 5 6 Select the point 100 0 from the list 7 From the Boundary Condition drop down select a Zero Flux boundary condition 8 Repeat for the remaining points referring to this table X Y Boundary Condition Expression 0 0 Temperature Expression 5 100 0 Zero Flux 100 30 Temperature Expression 6 90 30 Zero Flux SOILVISION SYSTEMS LTD Heated Pipeline 11 of 31 80 28 Continue 50 28 Continue 40 20 Continue 35 20 Continue 33 22 Flux Expression 200000 J hr m 2 23 22 Temperature Expression 6 21 20 Continue 0 20 Zero Flux 0 15 Continue NOTE The Temperature Expression boundary condition for the point 100 30 becomes the boundary condition for the following line segments that have a Continue boundary condition until
5. the gridlines and Close the dialog Click on Define Grid button again and move to the Y Grid Lines tab and repeat steps 7 to 8 for the Y gridlines Now that the grid has been set up elevations must be specified for all the grid points SOILVISION SYSTEMS LTD Heated Foundation 24 of 31 10 Enter O in the Set Nulls field 11 Click the Set Nulls button and all the missing elevations will be set to 0 12 Click OK to store the elevations and close the dialog e Define Surface 2 This surface is already present Follow the steps for defining Surface 1 elevations except enter 10 in the Set Nulls field and press the Set Nulls button This will set the Surface 2 elevations to 10m e Define Surface 3 The following steps are required to add the third surface to the model Since Surface 2 and Surface 3 have the same grid lines Surface 2 grid will be copied during insertion of the new surface 13 The Surface dialog can be opened by selecting Model gt Geometry gt Surfaces from the menu 14 Click New to open the Insert Surfaces dialog 15 Enter 1 as the Number of New Surfaces 16 Select to place the new surface At The Top 17 Select Copy Grid From An Existing Surface 18 Select Surface 2 from the drop down 19 Choose to Include the elevations 20 Enter 10m as the offset from Surface 2 This will set the elevation of the Z axis to 20m 21 Press OK to add the surface and 22 Click OK to close the dialog c Spe
6. EMS LTD Heated Pipeline 6 of 31 Material Properties The only soil properties required to solve this problem are those related to thermal conductivity since a steady state analysis is being performed Material 1 Slope Region Thermal Conductivity curve laboratory data Temperature C Conductivity J hr m C 10 1 58E 05 1 1 57E 05 0 1 1 56E 05 0 1 43E 05 0 1 1 28E 05 1 1 29E 05 10 1 30E 05 Material 2 Seam Region Thermal Conductivity curve laboratory data Temperature C Conductivity J hr m C 10 2 00E 05 1 1 90E 05 0 1 1 80E 05 0 1 50E 05 0 1 1 30E 05 1 1 25E 05 10 1 20E 05 2 1 Model Setup The following steps are required in order to set up and solve the model described in the preceding section The steps fall under the general categories of on as oo Create model Enter geometry Specify boundary conditions Apply material properties Specify model output Run model Visualize results a Create Model The following steps are required to create the model 1 Open the SVOFFICE Manager dialog SOILVISION SYSTEMS LTD Heated Pipeline 7 of 31 2 Create a new project called UserTutorial by pressing the New button next to the list of projects 3 Create a new model called Heated_Pipeline by pressing the New button next to the list of models The new model will be automatically added under the rec
7. a new boundary condition is specified By specifying a Flux Expression condition at point 33 22 the Continue boundary condition is stopped e Slope Region Shape 2 9 10 11 12 13 Select the Slope circle region from the drawing space From the menu select Model gt Boundaries gt Boundary Conditions to open the Boundaries dialog In the Boundary Condition drop down select a Temperature Expression boundary condition Enter the value 9 and Click OK to save the input Boundary Conditions and return to the workspace d Apply Material Properties The next step in defining the model is to enter the material properties for the two materials that are used for the model A material called 2D Tutorial 1 is defined for the major material region i e Slope Region and the material called 2D Tutorial 2 is defined for the smaller material region i e Seam Region This section will provide instructions on creating the first material Repeat the process to add the other material 1 Open the Materials dialog by selecting Model gt Materials gt Manager from the menu Click the New button to create a material Enter 2D Tutorial 1 for the material name The Material Properties dialog should pop up automatically NOTE When a new material is created the display color of the material can be specified using the Fill Color box in the Material Properties menu Any region that has a material assigned to it will dis
8. cify 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 and surfaces have been successfully defined the next step is to specify the boundary conditions on the region shapes A temperature of 3 C will be defined on the Ground region to simulate an outdoor temperature The basement will be set to a temperature of 10 C Boundary conditions can only be defined using a 2D view The steps for specifying the boundary conditions are as follows 1 Change to the 2D view by selecting View gt Model gt 2D SOILVISION SYSTEMS LTD Heated Foundation 25 of 31 2 10 11 12 13 14 15 16 17 Specify Ground as the region by selecting Model gt Geometry gt Regions from the menu and clicking on Ground Press OK to close the dialog From the menu select Model gt Boundaries g
9. click on the desired point Drag the cursor out to a radius of 2 Let go of the mouse button to finish the circle To ensure that the radius is set to 2 open the double click on the circle shape to open the Region Properties dialog Enter a radius of 2 if necessary Click OK to close the Region Properties dialog geometry been entered correctly the shape should look as follows NOTE If a mistake was made entering the coordinate points for a shape Select a shape with the mouse and select Edit gt Delete from the menu This will remove the entire shape from the region To edit the shape use the Region Properties dialog e Define the Seam Region The Seam Region corresponds to material 2 in the layout of the example 19 20 21 22 23 24 25 Ensure that Seam is current in the region selector Select Draw gt Model Geometry gt Region Polygon from the menu The cursor will now be changed to cross hairs Move the cursor near 0 10 in the drawing space You can view the coordinates of the current position of the mouse in the status bar just below the drawing space To select the point as part of the shape left click on the point Now move the cursor near 55 10 Left click on the point A line is now drawn from 0 10 to 55 10 Now move the cursor near 40 15 Left click on the point A line is now drawn from 55 10 to 40 15 and SOILVISION SYSTEMS LTD Heated Pipeline 10 of 31 26 For the last poin
10. d 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 After all the region geometry has been entered it will have the appearance of the diagram below without the coloring SOILVISION SYSTEMS LTD Heated Foundation 23 of 31 800 F Material EE 30 Tutorial Soil 26 0 22 0 Heated Foundation 18 0 14 0 E toot gt 604 20 Basement 2 0 6 0 10 0 PRA pr pr pr n 10 0 6 0 2 0 20 60 10 0 14 0 18 0 22 0 26 0 30 0 X m This model consists of three surfaces Although it is not required the two surface grids have the same dimensions and grid densities By default every model initially has two surfaces e Define Surface 1 This surface is already present so the next step is to define the grid lines 1 Select Surface 1 as the region by going to Model gt Geometry gt Surfaces and clicking on Surface 1 Press OK to close the dialog Click Model gt Geometry gt Surface Properties in the menu to open the Surface Properties dialog Select Elevation Data from the Definition Options drop down Select the Elevations tab and click the Define Grid button to set up the grid for the selected surface There will be default grid lines of O and 10 present Click the Add Regular button to open the Add Regular X Gridlines dialog Enter 2 for Start 1 for Increment Value and 22 for End Click OK to add
11. e name and type new text Press the New button to add a second region Change the name of the second region to Basement and Click OK to close the dialog The shapes that define each region will now be created Note that when drawing geometry SOILVISION SYSTEMS LTD Heated Foundation 20 of 31 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 Refer to the previous section of this manual for the geometry points for each region e Define the Main region 1 ee Specify Ground as the region by selecting Model gt Geometry gt Regions from the menu and clicking on Ground Press OK to close the dialog Select Draw gt Model Geometry gt Polygon Region from the menu The cursor will now be changed to cross hairs Move the cursor near 0 0 in the drawing space You can view the coordinates of the current position the mouse is at in the status bar just below the workspace To select the point as part of the shape left click on the Point Now move the cursor near 12 0 and then left click on the Point A line is now drawn from 0 0 to 12 0 Repeat this process for the remaining points Refer to the previous section of this manual for the geometry points for each region For the last point 0 10 Double click on the point to finish the shape A line is now drawn from 0 20 to 0 10 and the shape is automatically finished b
12. emark of Microsoft Corporation Soil Vision is a registered trademark of Soil Vision Systems Ltd SVOFFICE is a trademark of SoilVision Systems Ltd SVFLUX is a trademark of Soil Vision Systems Ltd CHEMFLUX is a trademark of Soil Vision Systems Ltd SVAIRFLOW is a trademark of SoilVision Systems Ltd SVSOLID is a trademark of Soil Vision Systems Ltd SVHEAT is a trademark of SoilVision Systems Ltd SVSLOPE is a trademark of Soil Vision 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 UTD eira 2 Introduction Heated P TESSERE 2 1 Model RR A 2 2 Results TERRE 3 scale 4 Table of Contents IPSN a ee aa ot cae eee ieee hati neee plintades padi osapldaed decesuaeds S UUP eet ile Hine ie el bee ie eas amp DISCUSSION 23105205 28 SS esse ires EER Heated FOUNCATIONS cc sists eit ear E O UA SS cotter ESC OENE 3 1 Model EERE 3 2 Results References SEUD aiia Tiga e paes eee eee Su DISCUSSION ss tspuiisse porcos a Perl diarias adia of 31 14 17 18 29 31 SOILVISION SYSTEMS LTD Introduction 4 of 31 1 Introduction The Tutorial Manual serves a special role in guiding the first time users of the SVHEAT software through a typical example problem The example is typical
13. entially air space In this model all blocks will be assigned a material 1 p AO D E 9 10 Specify Ground as the region by selecting Model gt Geometry gt Regions from the menu and clicking on Ground Press OK to close the dialog Select Model gt Materials gt Material Layers from the menu to open the Material Layers dialog Select the 3D Tutorial Soil material from the drop down for Layer 2 Select the 3D Tutorial Soil material from the drop down for Layer 1 Click OK to close the dialog Select Basement in the Region Selector using the right arrow in the top right of the dialog Ground Select Model gt Materials gt Material Layers from the menu to open the Material Layers dialog Select VOID from the drop down blank for Layer 2 Select the 3D Tutorial Soil material from the drop down for Layer 1 and SOILVISION SYSTEMS LTD Heated Foundation 27 of 31 11 Close the dialog using the OK button 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 visualization in ACUMESH or for inputting to othe
14. ently created UserTutorial project Use the settings shown below when creating a new model 4 Select the following Application SVHEAT System 2D Type Steady State Units Metric Time Units Seconds s 5 Click on OK Before entering any model geometry it is best to set the World Coordinate System to ensure that the model will fit into the drawing space 1 Access the World Coordinate System tab by selecting 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 105 y maximum 40 3 Click OK to close the dialog The workspace grid spacing needs to be set to aid in defining region shapes The Seam Region in this example consists of a filter type material The filter material of the model has coordinates of a precision of 0 5m In order to draw any aspect of the geometry with this precision using the mouse the grid spacing must be set to a maximum value of 0 5 1 Select View gt Options from the menu to access the Grid Spacing 2 Enter 0 5 for both the horizontal and vertical spacing and 3 Click OK to close the dialog b Enter Geometry A region 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 SVHEAT CAD workspace A region will have a set of geometric shapes e g polygons circles etc t
15. hat define its material boundaries Other modeling objects include features such as flux sections text and line art These features can be defined on any given region The present model is divided into two regions namely the Slope region and the Seam region Use the following steps to add the necessary regions SOILVISION SYSTEMS LTD Heated Pipeline 8 of 31 1 Open the Regions dialog by selecting Model gt Geometry gt Regions from the menu 2 Change the first region name from Region 1 i e R1 to Slope To do this highlight the name and type the new name Slope Press the New button to add a second region 4 Change the name of the second region to Seam and 5 Click OK to close the dialog The shapes that define each material region are now created Note that when drawing a geometric shape information will be added to the region that is current in the Region Selector The Region Selector is found at the top of the workspace and appears in the following image Slope mmi e Define the Slope Region Shape 1 Shape 1 refers to the entire region consisting of material 1 1 Select Slope as the region by going to Model gt Geometry gt Regions and clicking on Slope Select Draw gt Model Geometry gt Region Polygon from the menu The cursor will now be changed to cross hairs Move the cursor near 0 0 in the drawing space You can view the coordinates of the current position of the mouse in the status bar ju
16. inished solving the results will be displayed in the dialog of thumbnail plots within the SVHEAT 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 SOILVISION SYSTEMS LTD Heated Pipeline 15 of 31 60 5 F 20 5 20 4 L 40 T T T 0 20 40 60 80 100 x The Mesh plot displays the finite element mesh generated by the solver The mesh is automatically refined in critical areas such as around the pipe contact where there is a significant change in temperature The temperature contours indicate that the temperature of the pipe does not significantly influence the base of roadway Instead the heat flux due to the warming of the roadway surface has an influence of a few degrees SOILVISION SYSTEMS LTD Heated Pipeline 16 of 31 09 47 55 11 20 07 FlexPDE 5 0 19 Gradients 60 7 00 20 Scale E5 20 40 X Gradient Vectors show both the direction and the magnitude of the heat flow at specific points in the model Vectors show the heat flow is away from the pipeline as anticipated X Component of Flow in J hr 0 000000 Y Component of Flow in J hr 434461 1 Normal 1 On External Region Boundary Positive Flow is into Region 2 On Internal Region Boundary Region Given Positive Flow is into Given Region 3 On Internal Region Boundary Region Not Given Posit
17. ite element mesh 1 Open the Plot Manager dialog by selecting Model gt Reporting gt Plot Manager from the menu 2 The toolbar at the bottom left corner 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 Temp1i Select Te as the variable to plot from the drop down Turn off the Monitor output option under the Output Options tab Click OK to close the dialog and add the plot to the list Repeat these steps 2 to 6 to create the remaining plots shown below Note that So O the Mesh plots do not require the entry of a variable and O Plot Manager Plots Point Area Volume Flux Sections Boundary Flux Other Title Variable Restriction Temp1 Te KG 4 a Gradients gradtx gradty 8 Solution Mesh Add New Plot Copy Delete Properties Multiple Update 2 Piet Settings Add Default Default Plot 8 Click OK to close the Plot Manager and return to the workspace Boundary Flux plots should also be created for this model In order to do this complete the following steps 1 Select Model gt Reporting gt Plot Manager from the menu Select the Boundary Flux tab 3 Add a New Report for the bottom of the Slope region By default this boundary was named BN1 when the boundary condition was defined for this segment SOILVISION SYSTEMS LTD Heated Pipeline 14 of 31 Turn off the
18. ive Flow is into First Applicable Region 4 Internal Left Hand Rule Normal Flow in J hr 434461 1 The Flux through the base of the roadway is displayed in the report dialog showing a breakdown of the X Y and normal components of flow through the model SOILVISION SYSTEMS LTD Heated Foundation 17 of 31 3 Heated Foundation The following example will introduce you to a three dimensional model in SVHEAT The model is used to investigate steady state heat flow through a material resulting from a heated foundation under winter conditions The tutorial provides detailed set of instructions guiding the user through the creation of the 3D heat transfer model The model is generated using two regions three surfaces and one material The model data and material properties are provided below Project Foundations Model HeatedFoundTut3D Minimum authorization required STUDENT Model Description and Geometry Basement undation Region Shape Data for Tutorial HeatedFoundation3D Ground Region Basement Region x Y x Y 0 0 12 0 12 0 20 0 20 0 20 10 20 10 12 10 20 20 12 20 0 20 0 10 SOILVISION SYSTEMS LTD Heated Foundation 18 of 31 Material Properties 3D Tutorial Soil Material Properties Temperature C Conductivity J s m C 2 2000 1 1999 0 1000 1001 2 1002 3 1 Model Setup The following steps will be required in order to set up
19. ized using ACUMESH In order to 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 SOILVISION SYSTEMS LTD Heated Foundation 29 of 31 3 2 Results amp Discussion After the model has finished solving the results will be displayed in the dialog of thumbnail plots within the SVHEAT 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 SOILVISION SYSTEMS LTD Heated Foundation 30 of 31 13 33 13 11 20 07 FlexPDE 5 0 19 TempSurface on Z 10 24 1 72 3 30 10 2 9 90 9 60 9 30 9 00 8 70 8 40 8 10 7 80 7 50 l 7 20 6 90 6 60 6 30 6 00 5 70 5 40 5 10 4 80 4 50 4 20 Tutorial HeatedFoundTut3D Grid 4 p2 Nodes 25121 Cells 16396 RMS Err 0 0059 Stage 1 Integral 2541 165 SOILVISION SYSTEMS LTD References 31 of 4 References FlexPDE 5 x Reference Manual 2007 PDE Solutions Inc Spokane Valley WA 99206 31
20. lume Flux Sections Boundary Flux Surface Flux Other Title Variable Restriction Projection KG Temp1 Te X 12 SG Temp2 Te Y 10 A Gradients gradtx gradtz Y 10 88 TempSuface Te Z 10 Add New Plot Copy Delete Properties Multiple Update 2 L Piot Settings __Add Defauts Default Plot OUTPUT FILES Two output files will be generated for this tutorial example model a transfer file of temperatures 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 Enter the title AcuMeshOut Click OK to close the dialog and add the output file to the list Create the TempTransfer trn transfer file by pressed the Transfer File button Select Te as the variable Click OK to close the dialog and add the output file to the list and Click OK to close the Output Manager and return to the workspace or cor or e f 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 SVHEAT solver The solver will automatically begin solving the model g Visualize Results Once you have analyzed the model the output plots can be visual
21. model A clay is defined for both the ground and the basement This section provides instructions on creating the clay material 1 Open the Materials dialog by selecting Model gt Materials gt Manager from the menu Click the New button to create a material Enter 3D Tutorial Soil for the material name Press OK The dialog for the new material properties will pop up SOILVISION SYSTEMS LTD Heated Foundation 26 of 31 NOTE When a new material is created you can specify the display a color for the material using the Fill Color box on the Material Properties menu Any region that has a material assigned to it will display the material fill color Move to the Conductivity tab Click on the Data button beside the Unsaturated Thermal Conductivity ensure the Data appears on the drop down menu before clicking the Data button 7 Enter the laboratory data points as provided in the A Three Dimensional Example Model section at the beginning of this tutorial NOTE To view the laboratory data press the Graph button 8 9 10 11 Click the Volumetric Heat Capacity tab Select the Constant radio button Enter 1 95e6 for the Frozen VHC and Unfrozen VHC text field and Click OK on all opened dialogs to accept the changes and close the 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 material or be left as void A void area is ess
22. ns 2 Enter the World Coordinates System coordinates shown below into the dialog x minimum 10 y minimum 10 z minimum 0 x maximum 30 y maximum 30 z maximum 20 3 Click the OK button to close the Create New Model dialog and to create the new model The workspace grid spacing needs to be set to aid in defining region shapes The geometry data for this model has coordinates of a precision of 1m In order to effectively draw geometry with this precision using the mouse the grid spacing must be set to a maximum value of 1 1 The View Options dialog will appear 2 Enter 1 for both the horizontal and vertical spacing and 3 Click OK to close the dialog b Enter Geometry A region in SVHEAT 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 SVHEAT 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 are defined on any given region This model will be divided into two regions which are named Ground and Basement Each region will have one of the materials defined specified as the region material To add the necessary regions follow these steps 1 Open the Regions dialog by selecting Model gt Geometry gt Regions from the menu 2 Change the first region name from R1 to Ground Highlight th
23. open the Flux Section 2 Click on the point 21 20 with the mouse 3 To finish the Flux Section double click on point 35 20 A blue line with an arrow on the end should be drawn across the geometry 4 Default plots will be generated for reporting the results from the flux section will automatically be generated and 5 Notice that the flux section label is partially on the region boundary in the workspace To move the label location select the textbox in the workspace and drag it to the desired location NOTE Flux Section labels can be formatted in the same manner as regular text boxes 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 SOILVISION SYSTEMS LTD Heated Pipeline 13 of 31 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 There are numerous plot types that can be specified to visualize the results of the model Three plots will be generated for this tutorial example temperature contours thermal gradient vectors and the final solution fin
24. play the corresponding material fill color 5 Move to the Conductivity tab Select Data from the Unsaturated Thermal SOILVISION SYSTEMS LTD Heated Pipeline 2 of 31 Conductivity drop down and press the Data button 6 Enterthe laboratory data points as provided in the A Two Dimensional Example Model section at the beginning of this Tutorial Click the Volumetric Heat Capacity tab Select the Constant radio button 9 Enter 1 95e6 for the Frozen VHC and Unfrozen VHC text field 10 Click OK on all open dialogs to accept the changes made and return to the Materials Manager menu and 11 Repeat these steps to create the second material NOTE To view the thermal conductivity curve of the laboratory data press the Graph button on the bottom right of the Thermal Conductivity Data dialog The materials will also need to be applied to the model regions Follow these instructions in order to assign the materials to regions 1 Open the Regions dialog by selecting Model gt Geometry gt Regions from the menu For the Slope region select 2D Tutorial 1 from the Material drop down and For the Seam region select 2D Tutorial 2 from the Material drop down e Specify Model Output Flux sections can be used to show the rate of heat flow across a portion of the model for a steady state analysis and the rate of heat flow moving across a portion of the model in a transient analysis 1 Select Draw gt Flux Section from the menu to
25. r 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 plots will be generated for this tutorial example model including a plot of the temperature contours on both an X and Y plane gradient vectors temperature surface plot and the solution mesh 1 Open the Plot Manager dialog by selecting Model gt Reporting gt Plot Manager from the menu 2 The toolbar at the bottom left corner 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 Temp1 Select Te as the variable to plot from the drop down Move to the Projection tab Select Plane as the Projection Option Select X from the Coordinate Direction drop down o SO TB Enter 12 in the Coordinate field This will generate a 2D slice at X 12m on which the temperature contours will be plotted 9 Turn offthe Monitor option under the Output Options tab 10 Click OK to close the dialog and add the plot to the list 11 Repeat steps 2 to 9 to create the remaining plots as shown below Note that the Mesh plots do not require entry of a variable and 12 Click OKto close the Plot Manager and return to the workspace SOILVISION SYSTEMS LTD Heated Foundation 28 of 31 O Plot Manager Plots Point Area Vo
26. st below the drawing space 5 To select the point as part of the shape left click on the point Now move the cursor near 100 0 Left click on the point A line is now drawn from 0 0 to 100 0 7 Repeat this process for the remaining points as provided at the beginning of this tutorial This will define the geometry of the Slope Region 8 For the last point 0 10 double click on the point to finish the shape A line is now drawn from 0 15 to 0 10 and the shape is automatically finished SVHEAT will draw a line from 0 10 back to the starting point 0 0 NOTE At times it may be somewhat tricky to snap onto 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 It should also be noted that shapes should in this case be drawn counter clockwise e Define the Slope Region Shape 2 Shape 2 refers to the geometry of the heated pipeline 9 Ensure the Slope region is current in the region selector SOILVISION SYSTEMS LTD Heated Pipeline 9 of 31 10 11 12 13 14 15 16 17 18 If the slope Select Draw gt Model Geometry gt Region Circle from the menu The cursor will now be changed to cross hairs Move the cursor near 50 18 in the drawing space You can view the coordinates of the current position of the mouse in the status bar just below the drawing space To select the point as the circle center left
27. t 0 15 right click to snap the cursor to the point Double click on the point to finish the shape A line is now drawn from 40 15 to 0 15 and the shape of the seam is automatically finished SVHEAT will draw a line from 0 15 back to the start point 0 10 The diagram will appear as shown at the beginning of this tutorial after all the region geometries have been entered c Specify Boundary Conditions Boundary conditions must be applied to the points associated with each region 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 they are re defined The user may not define two different boundary conditions to 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 of the model geometry have been successfully defined the next step is to specify the boundary conditions An approximate geothermal gradient of 1 C 30m will be simulated by setting the temperature at the ground surface to 6 C and the surface at the base of the model to 5 C The temperature of the pipe is 9 C and the heat
28. t Boundary Conditions The Boundary Conditions dialog will open and display the boundary conditions for Surface 1 These boundary conditions will extend from Surface 1 to Surface 2 over Layer 1 Select Surface 3 from the drop down box located at the top right of the dialog Under the Surface Boundary Conditions tab select a Temperature Expression boundary condition from the surface boundary condition drop down box Enter 3 in the Constant Expression field Press OK to close the dialog Specify Basement as the region by selecting Model gt Geometry gt Regions from the menu and clicking on Basement Press OK to close the dialog From the menu select Model gt Boundaries gt Boundary Conditions The Boundary Conditions dialog will open to the Segment Boundary Conditions tab and display the boundary conditions for Surface 1 Select Surface 2 from the drop down box Select the point 12 0 from the list From the Boundary Condition drop down select a No BC boundary condition Select the point 20 10 from the list From the Boundary Condition drop down select a Temperature Expression boundary condition from the surface boundary condition drop down box This will cause the Constant Expression box to be enabled In the Constant Expression box enter a temperature of 10 and Press OK to close the dialog d Apply Material Properties The next step in defining the model is to enter the material properties for the material in the
29. the model described in the preceding section The steps fall under the general categories of Create model Enter geometry Specify boundary conditions Apply material properties Specify model output Run model omrn ao os Visualize results a Create Model 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 If the project does not exist create a new project called UserTutorial 3 Create a new model called HeatedFoundation3D by pressing the New button next to the list of models The new model will be automatically added under the recently created Tutorial project Use the settings shown below when creating the new model Application SVHEAT System 3D Type Steady State Units Metric Time Units Seconds s The Settings dialog will contain information about the current model System Type Units and Time Units The thermal conductivity data for the materials contained in the model are reported as J hr m C In this case the data for the model is in metric units and the units information will remain unchanged SOILVISION SYSTEMS LTD Heated Foundation 19 of 31 Before entering any model geometry it is best to format the Axes to ensure that the model will fit into the drawing space 1 Select the World Coordinate System tab Enter the values shown below for the X Y and Z dimensio
30. y SVHEAT by drawing a line from 0 10 back to the start point 0 0 Ifthe main geometry been entered correctly the shape should look like the following NOTE If a mistake was made entering the coordinate points for a shape then select a shape with the mouse and select Edit gt Delete from the menu This will remove the SOILVISION SYSTEMS LTD Heated Foundation 21 of 31 SOILVISION SYSTEMS LTD Heated Foundation 22 of 31 e Define the Basement 10 11 12 13 14 15 16 17 Select Basement as the region by going to Model gt Geometry gt Regions and clicking on Basement Press OK to close the dialog Select Draw gt Model Geometry gt Region Polygon from the menu Move the cursor near 12 0 in the drawing space You can view the coordinates of the current position of the mouse in the status bar just below the drawing space To select the point as part of the shape left click on the Point Now move the cursor near 20 0 and then left click on the Point A line is now drawn from 12 0 to 20 0 Now move the cursor near 20 10 and then left click on the Point A line is now drawn from 20 0 to 20 10 and For the last point 12 10 Double click on the point to finish the shape A line is now drawn from 20 10 to 12 10 and the shape is automatically finished by SVHEAT by drawing a line from 12 10 back to the start point 12 0 NOTE At times it may be somewhat tricky to snap to a gri
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