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

Roughness Height

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

Reply
 
LinkBack Thread Tools Display Modes
Old   March 25, 2013, 19:33
Default Roughness Height
  #1
New Member
 
sam
Join Date: Nov 2011
Posts: 25
Rep Power: 5
Sam0508 is on a distinguished road
Hi,
I would like analyze the pressure drop in a circular pipe.Here I known wall roughness height.How could i setup the prism layer thickness to capture the roughness effect i.e the first prism layer near to the wall should be higher than roughness height or Lower than roughness height.Adv thanx
__________________
Regards,
Sam
Sam0508 is offline   Reply With Quote

Old   March 26, 2013, 04:15
Default
  #2
Senior Member
 
siara817's Avatar
 
siamak rahimi ardkapan
Join Date: Jul 2010
Location: Copenhagen, Denmark
Posts: 218
Rep Power: 9
siara817 is on a distinguished road
Do you have any experimental result to prove your CFD? if Yes then try first with a prism layer, small enough to solve the viscous boundary layer. Otherwise you need to refine the mesh. I suggest you once without prism layer as well. Since, the prism layer is not an essential mesher.
__________________
Good luck
Siamak
siara817 is offline   Reply With Quote

Old   March 29, 2013, 04:29
Default Roughness Height- STAR CCM+
  #3
New Member
 
sam
Join Date: Nov 2011
Posts: 25
Rep Power: 5
Sam0508 is on a distinguished road
Quote:
Originally Posted by siara817 View Post
Do you have any experimental result to prove your CFD? if Yes then try first with a prism layer, small enough to solve the viscous boundary layer. Otherwise you need to refine the mesh. I suggest you once without prism layer as well. Since, the prism layer is not an essential mesher.

Hello siara,
Thank you.do u know roughness height Vs Prism layer Thickness.Plz ref attachment.
Attached Images
File Type: jpg prismlayer.JPG (61.5 KB, 24 views)
__________________
Regards,
Sam
Sam0508 is offline   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
Setting of Roughness Constant and Height Sing FLUENT 4 April 28, 2015 09:24
UDF: for the setting of roughness height maximus FLUENT 1 September 10, 2014 16:20
Trouble with Roughness Height Dragin STAR-CCM+ 1 June 17, 2009 16:32
atmospheric roughness height Alain BASTIDE CD-adapco 5 December 30, 2002 06:26
atmospheric roughness height Alain BASTIDE Main CFD Forum 0 December 27, 2002 17:32


All times are GMT -4. The time now is 22:54.