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Vangol March 15, 2013 03:20

Wall roughness effects on pressure drops
 
Dear All,

I'm trying to calculate pressure drops in a straight pipe with CFX 14.0.
I simulated two different cases with SST turbulence model:
- in the first case I set Wall Roughness = Smooth Wall on the solid boundary;
- in the second case I set Wall Roughness = Rough Wall (Sand Grain Roughness= 3mm).

In the Post-processing I evaluated the pressure drop for the two cases and it resulted perfectly the same. How it possible?

Thanks in advance.

feizaghaee July 12, 2013 06:41

Hi.
I think it's related to your mesh near the wall. check it out.


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