The pipe will be meshed as shown in figure 3 17

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The pipe will be meshed as shown in Figure 3-17. Figure 3-17: Pipe meshed using the Submap scheme for the wall face of the pipe and the project scheme for the volume ! It may be useful to remove the mesh from the display at this point; it is then easier to see the faces of the geometry for the last pipe.
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MODELING A THREE-PIPE INTERSECTION (3-D) Procedure © Fluent Inc., Sep-04 3-37 3. Mesh one of the pipes by hand-picking the source faces and then using the Cooper meshing tool. a) Select the third pipe in the graphics window. The criteria for the Cooper scheme are not fulfilled for this pipe, because GAMBIT cannot mesh the side face of the volume using the Map or Submap meshing schemes. However, you can force GAMBIT to use the Cooper scheme on this volume by selecting the Cooper scheme and then manually picking the source faces (the faces whose surface meshes are to be swept through the volume to form volume elements). When you click Apply , GAMBIT will automatically enforce the Submap scheme on the side face and modify the vertex types to honor the scheme selected. See the GAMBIT Modeling Guide for more information on using the Cooper meshing scheme. b) Select Hex in the Elements option menu under Scheme , and select Cooper under Type . c) Left-click in the Sources list box in the form, and then pick the source faces for the mesh by selecting all the faces of the pipe except the pipe wall. The faces are marked A through D in Figure 3-18.
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Procedure MODELING A THREE-PIPE INTERSECTION (3-D) 3-38 © Fluent Inc., Sep-04 ! Shift -middle-click on a face to unselect it and select the face next to it. You can also click Reset in the Mesh Volumes form to unselect all faces and volumes, and reset all parameters entered in the form. The four faces to be selected are at opposite ends of the pipe, as shown in Figure 3-18. You can select the faces in the graphics window, or you can use the Sources pick list. A D C B Figure 3-18: Source faces used to mesh one of the pipe volumes using the Cooper meshing scheme d) Retain the default Interval size of 1 under Spacing and click the Apply button at the bottom of the form. 4. Display the full mesh for the three-pipe intersection. a) Click the SPECIFY DISPLAY ATTRIBUTES command button at the bottom of the Global Control toolpad to open the Specify Display Attributes form.
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MODELING A THREE-PIPE INTERSECTION (3-D) Procedure © Fluent Inc., Sep-04 3-39 b) Select the Mesh: On option near the bottom of the form. c) Click Apply to display the mesh, then Close the form. The mesh for the three-pipe intersection is shown in Figure 3-19.
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Procedure MODELING A THREE-PIPE INTERSECTION (3-D) 3-40 © Fluent Inc., Sep-04 Figure 3-19: Face meshes for the three-pipe intersection
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MODELING A THREE-PIPE INTERSECTION (3-D) Procedure © Fluent Inc., Sep-04 3-41 Step 9: Examine the Quality of the Mesh 1. Select the EXAMINE MESH command button at the bottom right of the Global Control toolpad. This action opens the Examine Mesh form. a) Select the Sphere option under Display Type .
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Procedure MODELING A THREE-PIPE INTERSECTION (3-D) 3-42 © Fluent Inc., Sep-04 This creates a section through the grid that is spherical in shape. For the three-pipe geometry, a spherical section displays more useful information than a planar section.
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  • Spring '10
  • P.K.Lele
  • Geometry, Widgets, Faces

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