3.3 Strategy
In this tutorial, you will quickly create the basic geometry for a three-pipe intersection.
The basic geometry can be automatically meshed with tetrahedra, but your goal in this
tutorial is to create a conformal, hexahedral mesh for POLYFLOW, which requires some
decomposition of the geometry before meshing. Thus, the tutorial shows some of the typical procedures for decomposing a complicated geometry into “meshable” volumes.
The first decomposition involves using a brick to split off a portion of the three-pipe intersection. The resulting volume is described as a sphere “octant” (one-eighth of a sphere)
residing in the corner of the intersection, as shown in Figure 3-2. This volume, which is
very similar in shape to a tetrahedron, will therefore be meshed using GAMBIT’s Tet
Primitive scheme. Note that this creates a hexahedral mesh in a tetrahedral topology; it does
not create tetrahedral cells
The remaining geometry is then split into three parts, one for each pipe, as shown in
Figure 3-1. To do this, you will create an edge and three faces that are used to split the
volume into the required three parts. These volumes are meshed using GAMBIT’s Cooper
scheme (described in detail in the GAMBIT Modeling Guide). This tutorial illustrates
three different ways to specify the source faces required by the Cooper scheme.
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