When preparing a model for a CFD analysis, surfaces need to be closed in order to generate mesh. The process of surface wrapping therefore typically involves taking raw CAD data, closing holes in geometry, joining disconnected surfaces, removing interior and overlapping surfaces. The surface wrapping capability in pro-STAR, the pre- and post-processing package for STAR-CD, automatically ‘shrink-wraps’ a closed surface mesh made of triangles and/or quadrangles onto the geometry. The engineer simply takes the model, which can be an assembly of various sources such as native CAD (CATIA V4, CATIA V5, Unigraphics, Pro/ENGINEER), IGES, STEP AP203 ISO Standard, Parasolid, STL (Stereolythography), VDA-FS and NASTRAN formats and then shrink-wraps the surface.

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Their paper, “Multilevel Error Estimation and Adaptive h-Refinement for Cartesian Meshes with Embedded Boundaries” describes the team’s development of new techniques for error estimation and adaptive refinement for computational fluid dynamics (CFD) solutions.

Several features put this new h-refinement strategy a cut above previous adaptive meshing techniques: “It is general enough that it can be applied to any type of unstructured or hierarchical mesh, and, since it is parameter-free, it can be fully automated,” explains Aftosmis. The new meshing strategy was also designated to remove the dependence on user skill, making it quick and easy to generate meshes.

Aftosmis and Berger plan to integrate these error estimation and refinement techniques into their grid generation and solution software package, Cart3D this fall.

As a result of this partnership we are looking forward to an increasing level of support for ICEM DDN customers as well as a generally higher level of attention for ICEM DDN itself. This agreement will protect our customer’s investment in ICEM DDN for the future.