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ICEM CFD provides a module, called ICEM CFD Global, to rapidly generate global grids based on CAD surface models. Global grids are particularly attractive to the user because:
The user simply selects the CAD surfaces enclosing the space to be meshed, specifies the bounding box, the edge bunching on the bounding box, and one material point in each connected region.
ICEM CFD Global automatically generates a global grid and marks each cell as containing a specific material. For cells cut by a boundary, ICEM CFD Global calculates the percent occupancy of each material. The result is a conformal staircase grid.
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| Conformal Cartesian staircase grid generated with ICEM CFD Global |
A new H-Grid refinement capability allows the user to quickly create adaptive hexahedral staircase.meshes. H-Grids are grids where elements do not necessarily match 1-to-1 but rather might match 1-to-n. ICEM CFD Global first creates an initial Cartesian mesh and then refines it where the user has specified smaller element sizes using H-grid transitions. To control the local grid size the user simply assigns grid sizes to surfaces. The resulting Cartesian grid with H-grid refinement is a non-conformal staircase grid that has considerably fewer elements than a strict Cartesian grid.