CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > General Forums > Main CFD Forum

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

Register Blogs Members List Search Today's Posts Mark Forums Read

Like Tree1Likes
  • 1 Post By AliE

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   March 3, 2018, 18:20
Default Difference between Wall Shear Stress of No-slip and Rough Walls
  #1
New Member
 
A E
Join Date: Dec 2015
Posts: 29
Rep Power: 10
@E18 is on a distinguished road
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
@E18 is offline   Reply With Quote

Old   March 4, 2018, 07:24
Default
  #2
Senior Member
 
Join Date: Dec 2017
Posts: 153
Rep Power: 8
AliE is on a distinguished road
Quote:
Originally Posted by @E18 View Post
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
FMDenaro likes this.
AliE is offline   Reply With Quote

Old   March 5, 2018, 11:57
Default
  #3
New Member
 
A E
Join Date: Dec 2015
Posts: 29
Rep Power: 10
@E18 is on a distinguished road
Thanks for your reply. I will check out those.

Best,
A E
@E18 is offline   Reply With Quote

Reply

Tags
no slip condition, rough wall, sst k-omega, wall shear stress

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Multiphase flow - incorrect velocity on inlet Mike_Tom CFX 6 September 29, 2016 01:27
Wall shear stress due to roughness tsram90 FLUENT 0 October 27, 2014 04:28
Rough walls and SST (CFX11) Sans CFX 2 October 3, 2007 06:12


All times are GMT -4. The time now is 07:26.