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Wall roughness effects on pressure drops

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Old   March 15, 2013, 03:20
Exclamation Wall roughness effects on pressure drops
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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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Old   July 12, 2013, 06:41
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Hi.
I think it's related to your mesh near the wall. check it out.
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