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-   -   turbulence wall law on unstructred mesh (http://www.cfd-online.com/Forums/main/4523-turbulence-wall-law-unstructred-mesh.html)

Quain Tchew March 13, 2002 03:01

turbulence wall law on unstructred mesh
 
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?

Bart Prast March 14, 2002 06:29

Re: turbulence wall law on unstructred mesh
 
That's why most codes use prisms at the wall.

Quain Tchew March 18, 2002 21:03

Re: turbulence wall law on unstructred mesh
 
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

Astrid March 19, 2002 17:14

Re: turbulence wall law on unstructred mesh
 
Gambit can do it, definitely.

Astrid

Pete March 20, 2002 10:50

Re: prism grid generation
 
Gridgen can generate layers of prism cells as well.


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