This Week in CFD

This week’s CFD news is chock full o’ applications with nary a software announcement in sight. These apps include two studies of virus particle transmission on aircraft, one for aeroacoustics outside the aircraft, and another for an infamous detonation. Here you see my “CFD application of the week” as published by Gaylord, Blades, & Parsons in Nature. You’ll have to read on to find out what it is (but try to guess first).

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This Week in CFD

Another week, more CFD news. Some really cool applications this week including the aircraft for a new air racing series and this screen capture of Synthetik’s simulation of air blast loads on a Gummy Bear. You also have the opportunity to share your thoughts in a survey on design technology. A couple of articles on colormaps are included so that our CFD images present the “forest of numbers” in their best light. All this and much more.

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Recombination of Voxel Transition Cells for OpenFOAM Meshes

Pointwise V18.3 introduced a voxel capability (hex-core) that uses regular hexahedra instead of unstructured tetrahedra in regions away from the geometry model. The space between the final T-Rex (anisotropic tetrahedral extrusion) front and the farfield topology (see Figure 1) is filled with regular hexahedral cells. Use of regular hexahedra in the mesh can improve the CFD flow solver’s rate of convergence and solution accuracy. The transition between different sized hexahedral cells is achieved using combinations of tetrahedra and pyramid cells. This ensures maximum compatibility with a wide range of flow solvers. For some solvers like OpenFOAM, the usage of pyramids in the transition layers can be problematic. In this article, we describe a utility (vtCombine) for Caelus developed by Applied CCM that recombines the transition layers between the hexahedra into polyhedra cells. Resulting in smaller cell count, improved mesh quality and improved solver convergence.

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This Week in CFD

Still catching up with the backlog of CFD news but there’s a lot of good stuff including a new Lattice-Boltmann method, several open positions for those of you who are looking, financial updates from several companies to assess how they’re weathering the macroeconomic slowdown, a glowing review of Discovery Live, and a multiphysics simulation of the sound an electric guitar string would make when plucked. Shown here is a FieldView visualization of helicopter downwash from their presentation at the Altair Technology Conference.

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This Week in CFD

The CFD world did not stop producing cool news while This Week in CFD was on hiatus as evidenced by the fact that this post hardly put a dent in the backlog of bookmarks. There are two surveys seeking your input, one on using CFD software while working from home, the other on your wants from CAD software. And a research study delves into simulation and prototyping practices. If you have cold feet about using CFD, be certain to read the application story about the use of CFD in the design of winter cycling footwear (AirShaper results shown here). With that, let’s begin digging into the backlog.

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