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

Laminar flow and wall roughness

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   July 14, 2009, 23:06
Smile Laminar flow and wall roughness
  #1
New Member
 
Ki-hwan Jun
Join Date: Jul 2009
Posts: 9
Rep Power: 17
junbbung is on a distinguished road
I model bingham plastic, unsteady, vof(paste and water)..

the flow is laminar..(never turbulent)

well.. the channel I model is micro-channel and the wall roughness is very important.

Usually, in the laminar, the wall roughness doesn't affect the flow..

But as I know, in micro-channel, the wall roughness is very important for the pressure drop though the flow is laminar.

So I have to change the wall roughness condition, but in fluent the wall roughness condition is not activated in laminar flow...

of course I know, the roughness condition is activated in turbulent...
But what I need is the method to change the wall roughness condition in laminar flow..


using UDF... is this possible??

or is there other method?


well.. is there a method that I set the turbulent setting and give some appropriate value for the laminar flow?

I am really wondering that...

and, i ask you an advice about whether this is possible or not in fluent setting... please...

Last edited by junbbung; July 15, 2009 at 03:00.
junbbung is offline   Reply With Quote

Old   December 2, 2012, 06:57
Default
  #2
New Member
 
ammm
Join Date: Nov 2012
Posts: 21
Rep Power: 14
ammm is on a distinguished road
if you set a turbulent viscous and change roughness but you have a laminar flow it doesnt make a significant change
ammm is offline   Reply With Quote

Old   November 26, 2022, 22:22
Default How to simulate laminar flow
  #3
New Member
 
Cesar Cabrera
Join Date: Nov 2022
Posts: 3
Rep Power: 4
Cesar Cabrera is on a distinguished road
Hello!

I am trying to simulate the jet from a laminar flow pipe. I have not been able to model the geometry to define the two phases of fluids, water and air

Can anybody help me?

thanks in advance

César
Cesar Cabrera is offline   Reply With Quote

Reply

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
Boundary Layer of Laminar Flow over a Flat Plate Blasius_Pohlhausen_Crocco Main CFD Forum 12 September 30, 2013 18:35
Influece of wall velocity in the main flow marvin CFX 0 March 22, 2008 03:05
Surface roughness in laminar flow carno FLUENT 4 August 19, 2007 16:52
Multicomponent fluid Andrea CFX 2 October 11, 2004 06:12
what the result is negatif pressure at inlet chong chee nan FLUENT 0 December 29, 2001 06:13


All times are GMT -4. The time now is 06:06.