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How Do You Define a Good Grid?
Posted Mon December 22, 2014 @08:18AM
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Application By John Rhoads, Ph.D.
Senior Engineer, Pointwise

Computational fluid dynamics (CFD) is essentially a series of approximations; the role of the practitioner is managing the magnitude of the errors in these approximations. In CFD, one of the most basic approximations lies in the type of cells used for the simulation. This article will address some of the potential pitfalls encountered with a generic cell-centered finite volume scheme.

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Automating CFD Meshing Via Scripting
Posted Tue February 25, 2014 @12:12PM
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Grid Generation John Rhoads,
Pointwise, Inc.

The holy grail of the preprocessing world is to be able to produce in the blink of an eye a mesh that meets every grid quality criteria imaginable around any arbitrary geometry. In reality, discretizing the volume around an object can present a number of challenges, particularly when you place constraints on the shape and orientation of the elements. These challenges ultimately require users to make a choice between automatic meshing solutions or manual mesh generation.

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Quality and Control – Two Reasons Why Structured Grids Aren't Going Away
Posted Wed May 15, 2013 @01:34PM
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Grid Generation 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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Surface Wrapping Capability Drastically Reduces Meshing Time
Posted Fri January 30, 2004 @10:05AM
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News The CD adapco Group, leading provider of advanced computationally-based engineering solutions, announces a unique capability for surface wrapping in its CFD (Computational Fluid Dynamics) software STAR-CD.

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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Help Requested Converting a Grid Format
Posted Fri September 12, 2003 @08:23AM
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Help Desk I have a mesh file which has "PFG" format (PLOT3D 3D UNFORMATED). I would like to use it in Fluent 6 software, but this software can not support this format. What should I do? Please help me. Thanks a lot.

My E-mail is:

I am looking forward to receiving some help.

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Researcher Awarded for New Mesh Refinement Strategy
Posted Thu July 11, 2002 @04:48PM
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News NASA's NAS Division researcher Michael Aftosmis and colleague Marsha Berger, professor and deputy director of Courant Institute, New York University, have received the American Institute of Aeronautics and Astronautics (AIAA) best paper award for 2002.

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.

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    What type of geometry definition do you use most?
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