Strategy modeling a three pipe intersection 3 d 3 4

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Strategy MODELING A THREE-PIPE INTERSECTION (3-D) 3-4 © Fluent Inc., Sep-04 Two other helpful topics are covered in this tutorial: the use of journal files and the mesh- ing of boundary layers. The journal file contains a record of all your command inputs to GAMBIT. This file can be edited and your inputs can be converted into variable parame- ters that allow subsequent geometries (with changes in key dimensions, for example) to be quickly created and meshed. The boundary layer meshing tools in GAMBIT allow you to control how the mesh is refined near walls and other boundaries.
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MODELING A THREE-PIPE INTERSECTION (3-D) Procedure © Fluent Inc., Sep-04 3-5 3.4 Procedure Start GAMBIT. Step 1: Select a Solver 1. Choose the solver you will use to run your CFD calculation by selecting the following from the main menu bar: Solver POLYFLOW The choice of a solver dictates the options available in various forms (for example, the boundary types available in the Specify Boundary Types form). The solver currently selected is indicated at the top of the GAMBIT GUI. Step 2: Create the Geometry 1. Create the three pipes for the intersection. GEOMETRY VOLUME CREATE VOLUME R This command sequence opens the Create Real Cylinder form. a) Create the first pipe. i. Enter a Height of 10 in the Create Real Cylinder form. ii. Enter 3 for Radius 1 .
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Procedure MODELING A THREE-PIPE INTERSECTION (3-D) 3-6 © Fluent Inc., Sep-04 The text entry box for Radius 2 can be left blank; GAMBIT will set this value by default to be the same value as Radius 1 . iii. Select Positive Z (the default) in the list to the right of Axis Location . iv. Click Apply . b) Create the second pipe. Use the same Height and Radius 1 as above, and select Positive X in the list to the right of Axis Location . c) Create the third pipe. Use the same Height and Radius 1 as above, and select Positive Y in the list to the right of Axis Location . 2. Click the FIT TO WINDOW command button , at the top left of the Global Control toolpad, to view all three cylinders. You can rotate the view by holding down the left mouse button and moving the mouse. The cylinders are shown in Figure 3-3. Figure 3-3: Three cylinders for the three-pipe intersection
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MODELING A THREE-PIPE INTERSECTION (3-D) Procedure © Fluent Inc., Sep-04 3-7 3. Create a sphere to complete the basic geometry. GEOMETRY VOLUME CREATE VOLUME R This command sequence opens the Create Real Sphere form. a) Enter 3 for the Radius . b) Click Apply . 4. Unite the four volumes into one volume. GEOMETRY VOLUME BOOLEAN OPERATIONS This command sequence opens the Unite Real Volumes form. a) Shift-left-click all of the volumes in the graphics window, and click Apply . These volumes will be united into one volume. The completed geometry is shown in Figure 3-4.
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Procedure MODELING A THREE-PIPE INTERSECTION (3-D) 3-8 © Fluent Inc., Sep-04 Figure 3-4: The completed geometry
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MODELING A THREE-PIPE INTERSECTION (3-D) Procedure © Fluent Inc., Sep-04 3-9 Step 3: Decompose the Geometry It is possible to automatically mesh this full geometry using the TGrid scheme.
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