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

Turbulence model for PDF-Method

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

Reply
 
LinkBack Thread Tools Display Modes
Old   August 15, 2008, 05:17
Default Turbulence model for PDF-Method
  #1
joerg
Guest
 
Posts: n/a
Dear all, I try to simulate a swirl-stabilized combustor. I employ the non-premixed-pdf-model. After tangeling around with the urfs I finally get a solution. But the flame seems to be unrealistic. It is very very thin. Turbulence modelling is covered by rke, wall treatment is done by enhanced wall treatment, y_plus is around 1. Does anyone has a suggestion regarding the following points: (1) Is there a turbulence model which may be suited better for this case? (2) Is it of any advantage to include the swirl-modification available in the turbulence model(s)? (3) Is it better to ramp the injected mass flow instead of increasing the urfs for the discrete phase? (4) Does high swirling flow eventually requires rsm-modelling? (I know about anisotropy, but I thought rke would take this into account.)

Thank you very much indeed for your answers.

Best regards, joerg
  Reply With Quote

Old   August 16, 2008, 03:28
Default Temperature Contours uploaded
  #2
joerg
Guest
 
Posts: n/a
I uploaded a contour plot of total temperature. This doesn't look like a flame to me. But some of you combustion pro's can help me out with this, I hope. Thanks for any advice

http://img137.imageshack.us/my.php?i...ture002uy5.png
  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
Turbulence Specification Method Srivatsan V. Rajagopalan FLUENT 5 January 31, 2011 07:39
Inlet : Turbulence Specification Method PK FLUENT 0 February 2, 2006 11:40
Renormalization Group Method in Turbulence Model wood Main CFD Forum 2 January 10, 2000 20:15
Turbulence by using MAC method Valdemir G. Ferreira Main CFD Forum 0 November 20, 1999 10:33
Multigrid Method in Turbulence Modelling Bipin Lokhande Main CFD Forum 1 November 11, 1998 20:20


All times are GMT -4. The time now is 08:08.