This hybrid mesh from Gridgen for an aerodynamic platform from Propulsive Wing exemplifies the T-Rex technique.

This hybrid mesh from Gridgen for an aerodynamic platform from Propulsive Wing exemplifies the T-Rex technique.

Latest Gridgen Release Cuts Hybrid Mesh Sizes by More Than Half

FORT WORTH, TX (24 November 2009) – Pointwise today released the latest update to its Gridgen meshing software for computational fluid dynamics (CFD) with new tools for drastic size reductions in hybrid meshes.

"Customers love hybrid meshes because they can be generated very quickly using Gridgen's T-Rex (anisotropic tetrahedral extrusion) technique, but the resulting meshes can be very large," said Dr. John Steinbrenner, Pointwise's vice president for research and development. "In the latest Gridgen release, improvements to the algorithm that combines tetrahedra into prisms produce up to a 57 percent reduction in total cell count relative to the previous version of the software."

Gridgen's T-Rex technique extrudes layers of high quality, high aspect ratio tetrahedra for boundary layer resolution, gradually transitioning to isotropic tets away from the body. An optional post-processing step combines adjacent tetrahedra into pyramid and prism elements in the extrusion layer. Prism recombination was frequently halted in previous versions by mesh quality issues and cell topology restrictions on symmetry planes. By removing many of these limitations in the new Gridgen Version 15.15, final cell counts can be reduced dramatically. Customers benefit because a smaller grid requires less memory, runs faster in the CFD solver and produces results sooner.

"A 27 million cell mesh for a modern, complex fighter aircraft was reduced to 12 million cells, and similar reductions were obtained for the AIAA shock boundary layer interaction benchmark case," said Steinbrenner. "Combined with the automation of this technique, these smaller meshes make hybrid meshing very effective for the CFD practitioner."

Pointwise, Inc. is solving the top problem facing engineering analysts today -- mesh generation for computational fluid dynamics (CFD). The company's Gridgen and Pointwise software generates structured, unstructured, and hybrid meshes; interfaces with CFD solvers, such as FLUENT, STAR-CD, and ANSYS CFX, as well as many neutral formats, such as CGNS; runs on Windows (Intel and AMD), Linux (Intel and AMD), Mac, and Unix, and has scripting languages that can automate CFD meshing. Large manufacturing firms and research organizations worldwide rely on Pointwise as their complete CFD preprocessing solution.

More information about Gridgen and Pointwise is available at

The Propulsive Wing is a new patented aerodynamic platform that integrates an embedded, distributed cross-flow fan propulsion system within a thick wing. Image courtesy of Dr. Joseph Kummer, president and principal scientist at Propulsive Wing LLC in Elbridge, New York. More information about Propulsive Wing is available at

Pointwise and Gridgen are registered trademarks and Pointwise Glyph, Gridgen Glyph, and T-Rex are trademarks of Pointwise, Inc. All other trademarks are property of their respective owner.

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Jan Batts