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Advice needed for meshing for wall functions

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Old   April 22, 2009, 23:09
Question Advice needed for meshing for wall functions
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D Zinger
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Hello all

firstly, I read that y plus should be between 30 and 500, but nearer 30.

If the first cell height is such that y+ = 30, how fine should the mesh be immediately afterwards? My first instinct was to gradually increase frm the first cell height, but then I thought maybe it needs to be finer because the gradients are probably still quite high in that region. I just wanted to check...

I also have another question... how fine does the mesh need to be along the line of the surface. I'm dealing with 2d external flow with re of the order 10^4.
does somewhere around 1x10^-3 to 5x10^-3 sound reasonable?

Thanking you all

Dan

Last edited by zinger; April 22, 2009 at 23:11. Reason: to add detail
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density, grid, mesh, structure, wall functions

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