|December 27, 2002, 16:32||
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
|Thread||Thread Starter||Forum||Replies||Last Post|
|how to choose the roughness height||icestar||FLUENT||10||August 31, 2012 09:00|
|Trouble with Roughness Height||Dragin||STAR-CCM+||1||June 17, 2009 16:32|
|Setting of Roughness Constant and Height||Sing||FLUENT||1||January 21, 2007 07:53|
|UDF: for the setting of roughness height||maximus||FLUENT||0||May 7, 2006 21:26|
|atmospheric roughness height||Alain BASTIDE||CD-adapco||5||December 30, 2002 05:26|