Urgent! 2*Roughness Height >grid height -- CFD Online Discussion Forums

January 15, 2008, 07:56	*Re: Urgent! 2Roughness Height >grid height**	#3
rodi Guest Posts: n/a	Thanks for your reply~! The roughness height(Ks) is computed from the constant(n) in Manning's formula. In my case, n=0.025 and there is a empirical formula : 1/n=17.72*lg(11.89/Ks), then Ks=0.066m As the User's Guide says,make sure that the distance from the wall to the centroid of the wall-adjacent cell is greater than Ks. 1st cell height should >0.132m (2Ks), at the same time, Y+ will out the range of (30,100).It looks like incompatible! Could you help me? Best regards！rodi

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