Difference between Wall Shear Stress of No-slip and Rough Walls

@E18 · March 3, 2018, 19:20

Hi,

I have a very general question, does having a rough wall increase the wall shear stress value? I am using a sst k-w closure if that matters.

Thanks,
A E

AliE · March 4, 2018, 08:24

Quote:

Originally Posted by @E18

Hi,

I have a very general question, does having a rough wall increase the wall shear stress value? I am using a sst k-w closure if that matters.

Thanks,
A E

Hello,

Well, it depends on the type of roughness. If its scale is small compared with the viscous some layer size, you can have skin friction drag reduction and this is called riblet effect. The topic is very well explained into the works by Jimenez (Turbulent flows over rough walls) and Garcia-Mayoral (drag reduction by riblets).

Hope this help,

AliE

@E18 · March 5, 2018, 12:57

Thanks for your reply. I will check out those.

Best,
A E

March 3, 2018, 19:20	Difference between Wall Shear Stress of No-slip and Rough Walls	#1
@E18 New Member A E Join Date: Dec 2015 Posts: 29 Rep Power: 11	Hi, I have a very general question, does having a rough wall increase the wall shear stress value? I am using a sst k-w closure if that matters. Thanks, A E

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March 5, 2018, 12:57		#3
@E18 New Member A E Join Date: Dec 2015 Posts: 29 Rep Power: 11	Thanks for your reply. I will check out those. Best, A E