|December 27, 2002, 17:32||
atmospheric roughness height
I work with atmospheric boundary layer.
wind profile of inlet boundary layer is : u=u_tau/kappa*ln(z/z_0) where roughness height z_0=0.07 meter (flat plane)
Turbulence intensity profile : I_t=1/ln(z/z_0)
I use a law of wall : u_plus=1/kappa*ln(z+/z+_0)
In StarCD Methodology page 6-6, i found that y_p (height of the center of cell) should be 4 times larger than the roughness height.
My questions :
1. I'm looking for publications on roughness height and CFD (witch grid can i take), could you help me?
2. Witch y+ range can i give?
3. Is this modelisation good?
4. Witch lenght scale can i take (i just know that L_30m=100m)?
PS : I try a "power law" for the wind profil and i obtain bad results because i use low wind and power low is for strong wind
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