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

Surface roughness in laminar flow

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

Reply
 
LinkBack Thread Tools Display Modes
Old   August 16, 2007, 01:24
Default Surface roughness in laminar flow
  #1
carno
Guest
 
Posts: n/a
Hi,

I am not solving a laminar flow problem. In that do surface roughness value matters? Since I am under predicting the pressure loss value in a system?

Where to input the surface roughness, I am not finding any place in wall BC.

Thanks
  Reply With Quote

Old   August 16, 2007, 02:45
Default Re: Surface roughness in laminar flow
  #2
chouaib
Guest
 
Posts: n/a
In the Wall boundary conditions Panel.
  Reply With Quote

Old   August 16, 2007, 04:05
Default Re: Surface roughness in laminar flow
  #3
Dr. Flow Squad
Guest
 
Posts: n/a
Surface roughness have NO influence on pressure drop at all in laminar flow. It is only Reynolds dependent: dP = rho * 64/Re * L/D * *V^2 -Dr. Flow Squad http://tinyurl.com/2gkjh8
  Reply With Quote

Old   August 19, 2007, 14:35
Default Re: Surface roughness in laminar flow
  #4
AAA
Guest
 
Posts: n/a
Hi

You can specify roughness height and roughness constant in the walls BC panel

  Reply With Quote

Old   August 19, 2007, 15:52
Default Re: Surface roughness in laminar flow
  #5
chouaib
Guest
 
Posts: n/a
Hi AAA, You can see the message of Dr. Flow Squad. The flow is laminar. Chouaib
  Reply With Quote

Reply

Thread Tools
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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
nutRoughWallFunction and Surface Roughness Documented AlanR OpenFOAM Programming & Development 47 February 21, 2015 12:37
Surface roughness alefem FLOW-3D 6 June 3, 2010 12:49
Problem with capturing water-spreading for free surface flow devesh.baghel OpenFOAM 2 December 10, 2009 02:21
Laminar Flow rvallejo CFX 1 November 16, 2009 10:49
Surface roughness in Flow-3d Marco FLOW-3D 2 December 23, 2008 22:12


All times are GMT -4. The time now is 20:22.