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carno August 16, 2007 01:24

Surface roughness in laminar flow
 
Hi,

I am not solving a laminar flow problem. In that do surface roughness value matters? Since I am under predicting the pressure loss value in a system?

Where to input the surface roughness, I am not finding any place in wall BC.

Thanks

chouaib August 16, 2007 02:45

Re: Surface roughness in laminar flow
 
In the Wall boundary conditions Panel.

Dr. Flow Squad August 16, 2007 04:05

Re: Surface roughness in laminar flow
 
Surface roughness have NO influence on pressure drop at all in laminar flow. It is only Reynolds dependent: dP = rho * 64/Re * L/D * *V^2 -Dr. Flow Squad http://tinyurl.com/2gkjh8

AAA August 19, 2007 14:35

Re: Surface roughness in laminar flow
 
Hi

You can specify roughness height and roughness constant in the walls BC panel


chouaib August 19, 2007 15:52

Re: Surface roughness in laminar flow
 
Hi AAA, You can see the message of Dr. Flow Squad. The flow is laminar. Chouaib


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