The specific boundary types will be defined inside

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The specific boundary types will be defined inside the POLYFLOW solver.
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Procedure MODELING A THREE-PIPE INTERSECTION (3-D) 3-46 © Fluent Inc., Sep-04 iii. Check that Faces is selected as the Entity . iv. Shift -left-click the end of one of the pipes (the face marked A in Figure 3-21) and click Apply to accept the selection. C A B Figure 3-21: Boundary types for faces of the three-pipe intersection b) Define the two flow outlets. i. Enter the name outflow2 in the Name text entry box. ii. Check that ELEMENT_SIDE is still selected in the Type option menu and Shift - left-click the end of one of the other pipes in the graphics window (the face marked B in Figure 3-21). iii. Click Apply to accept the selection of the face. iv. Set the Type for the end of the third pipe (the face marked C in Figure 3-21) to be ELEMENT_SIDE , using the Name outflow3 . c) Define wall boundary types for the walls of the three-pipe intersection. i. Enter the name wall4 in the Name text entry box.
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MODELING A THREE-PIPE INTERSECTION (3-D) Procedure © Fluent Inc., Sep-04 3-47 ii. Check that ELEMENT_SIDE is still selected in the Type option menu and pick all of the wall faces (the outer walls of the three pipes and the outer face of the sphere octant) in the graphics window. ! You will select four faces in total. iii. Click Apply to accept the selection of the faces. The boundaries for the three-pipe intersection are shown in Figure 3-22. (NOTE : To display the boundary types in the graphics window, select the Show labels options on the Specify Boundary Types form.) Figure 3-22: Boundary types for the three-pipe intersection Note that when GAMBIT writes a mesh, any volumes (in 3-D) on which you have not specified a continuum type will be written as FLUID by default. This means that you do not need to specify a continuum type in the Specify Continuum Types form for this tutorial.
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Procedure MODELING A THREE-PIPE INTERSECTION (3-D) 3-48 © Fluent Inc., Sep-04 Step 11: Export the Mesh and Save the Session 1. Export a mesh file for the three-pipe intersection. File Export Mesh… This command sequence opens the Export Mesh File form. a) Enter the File Name for the file to be exported ( intersection.neu ). b) Click Accept . The file will be written to your working directory. 2. Save the GAMBIT session and exit GAMBIT. File Exit GAMBIT will ask you whether you wish to save the current session before you exit. Click Yes to save the current session and exit GAMBIT.
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MODELING A THREE-PIPE INTERSECTION (3-D) Summary © Fluent Inc., Sep-04 3-49 3.5 Summary In this tutorial, you created geometry consisting of three intersecting pipes. Before creat- ing the mesh, you decomposed the three-pipe geometry into four volumes: the three indi- vidual pipes and the wedge-shaped corner of the intersection (the sphere “octant”). These constituent volumes were readily meshed using GAMBIT’s Cooper and Tet Primitive mesh- ing schemes.
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