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Figure 9: A simple butterfly topology surface grid (orange and yellow) is extruded along a line (green), around an axis (red), and along a user-defined path (blue) to create a volume grid.

From:

Grid Generation: Quality and Control – Two Reasons Why Structured Grids Aren't Going Away

Posted Wed May 15, 2013 @01:34PM

by John Chawner,
Pointwise, Inc.

One could be forgiven for thinking the computational fluid dynamics (CFD) world has converted entirely to unstructured (or hybrid) meshing. Certainly, Pointwise has contributed to that impression with our emphasis on anisotropic tetrahedral extrusion (T-Rex), our highly automated hybrid mesh generation technique with near-wall boundary layer resolution.

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