CFD Online Logo CFD Online URL
Home > Forums > FLUENT

Fluent 6.2 + LES

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

LinkBack Thread Tools Display Modes
Old   August 23, 2005, 10:59
Default Fluent 6.2 + LES
Posts: n/a

I am working on a simple straight pipe flow problem. I am using LES - Dynamic model to solve this problem. I have solved the problem initially using the standard k-epsilon model. I have let the solution converge using this model and then started the LES simulation as suggested in the fluent user guide by using the "initialize-instantaneous-vel" command at the TUI. The time step I am using is 0.002. The flow Reynolds number is 100,000. After letting the solution run for some 20,000~30,0000 iterations I see that the fluctuations RMS X,Y,Z components look quite right. Even the mean streamwise velocity(flow direction) looks right and is comparable to the RANS model. The only thing that does not look right is the wall shear stress. I am looking at the area weighted average value of the wall shear stress value and it is very very less when compared to the value obtained from the RANS simulation. I am not able to figure out whats happening.

Could anyone guide me to where and how this can happen? Also could anyone let me know approximately as to how many iterations it would be before we can get a decent LES solution.
  Reply With Quote


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
What is "Resolved Reynolds Stress" for LES model in Fluent? ivanbuz FLUENT 0 November 1, 2009 17:36
LES and near wall treatment approach in Fluent khosro1355 Main CFD Forum 1 July 10, 2009 10:49
How to import mesh from ICEMCFD to Fluent 6.2 jeevan kumar CFX 5 October 20, 2008 05:41
Fluent 6.2 and 6.3 compatibility Ale FLUENT 0 July 31, 2008 03:47
LES with Fluent sat FLUENT 0 August 2, 2004 18:32

All times are GMT -4. The time now is 18:43.