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Old   February 4, 2006, 09:01
Default near wall first node
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Hi, I am studying numerical wind tunnel of atmospheric boundary layer. the ground roughness length is 1.05m, and the Reynoldy no. is 7*10^6.

According to the Y+ calculator, if y+ is assumed to 11.63 and 500, the distance of first grid is 0.4*10^-5~0.2*10^-3m. The grid is too small. Also, Fluent claims that the first node should be larger than the roughness height.

what is the problem? How can I do? Thanks
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