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Forum: CFX

December 7, 2009, 17:58

Replies: 7

Wind Velocity Profile in ANSYS CFX

Views: 6,513

Posted By AliTr

Glen, Thank you for pointing to that. However, z0...

Glen, Thank you for pointing to that. However, z0 is also described as the surface roughness and it is rarely more than 1, then I assumed that treatment should work as far as the first mesh elements...

Forum: CFX

December 6, 2009, 17:47

Replies: 7

Wind Velocity Profile in ANSYS CFX

Views: 6,513

Posted By AliTr

use max(1[m],z) instead of z This will keep z>0...

use max(1[m],z) instead of z
This will keep z>0 for all values.
The assumptions here are:
z0<1 and your mesh does not have elements thinner than 1m close to ground.

Forum: CFX

December 4, 2009, 02:36

Replies: 7

Wind Velocity Profile in ANSYS CFX

Views: 6,513

Posted By AliTr

1-I assume you are using logaritmic law to define...

1-I assume you are using logaritmic law to define your ABL which is
U(z) = (U*/k) ln(z/z0)

U* (Ufrict) and Z0 should be determined by a curve fit to wind data recorded at the mast located...

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