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turbulence wall law on unstructred mesh

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Old   March 13, 2002, 03:01
Default turbulence wall law on unstructred mesh
  #1
Quain Tchew
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I'm developing a code computing 3D compressible turbulence flow on unstructured mesh.

I don't want to make many hexahedrons near the wall, for this method requires enormous computing. I want to implement wall law on tetrahedron mesh.

I know I must calculate y+ and u+ of the near wall Control Volume(CV), and then according the y+, use different function calculate turbulence viscidity.

But which CV should I calculate? Some CV have a face on the wall, some have a edge on the wall, and some have a vertex on the wall.

How to calculate the turbulence stress resulted from the wall, k and e in the near wall CV? Should I integrate in a tetrahedron?
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Old   March 14, 2002, 06:29
Default Re: turbulence wall law on unstructred mesh
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Bart Prast
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That's why most codes use prisms at the wall.
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Old   March 18, 2002, 21:03
Default Re: turbulence wall law on unstructred mesh
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Quain Tchew
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I see.

But how can I generate prisms at the wall? can Gambit or gridgen do it?

If I have to progame to implement it, where can I find some article about it?

Thanks
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Old   March 19, 2002, 17:14
Default Re: turbulence wall law on unstructred mesh
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Astrid
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Gambit can do it, definitely.

Astrid
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Old   March 20, 2002, 10:50
Default Re: prism grid generation
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Pete
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Gridgen can generate layers of prism cells as well.
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