Wall roughness effect on pressure drops

Vangol · March 13, 2013, 05:31

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.

Boris_M · March 20, 2013, 05:50

I think you sliped into the wrong part of the forum. You should try the Ansys part of the forum.

Boris

March 13, 2013, 05:31	Wall roughness effect on pressure drops	#1
Vangol New Member - Join Date: Mar 2013 Posts: 3 Rep Power: 13	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.

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March 20, 2013, 05:50		#2
Boris_M Disabled Join Date: Jul 2009 Posts: 616 Rep Power: 24	I think you sliped into the wrong part of the forum. You should try the Ansys part of the forum. Boris