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

changing model constants in k-e turbulence model

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

Like Tree1Likes
  • 1 Post By opaque

Reply
 
LinkBack Thread Tools Display Modes
Old   October 2, 2006, 17:20
Default changing model constants in k-e turbulence model
  #1
Sunil
Guest
 
Posts: n/a
Hi, I would like to know if there is a way to change the Turbulent Prandtl number in CFX when I am using k-e model. This is the Pr_T ( = 1) and Pr_E (= 1.3) in the model equations. There is an option to change ce1 (1.44) and ce2 (1.92), but I cannot find one for the other constants.

Thanks
  Reply With Quote

Old   October 2, 2006, 18:46
Default Re: changing model constants in k-e turbulence mod
  #2
opaque
Guest
 
Posts: n/a
Dear Sunil,

Did you check under TURBULENCE MODEL/Advanced Control/K COEFFCIENTS/TURBULENT FLUX CLOSURE?

Good luck, Opaque

rockzh likes this.
  Reply With Quote

Old   October 3, 2006, 11:55
Default Re: changing model constants in k-e turbulence mod
  #3
Sunil
Guest
 
Posts: n/a
Thanks for the reply. I did check that and I think it is not the same as what I am looking for. flux closure has option to change the turbulent Schmidt number which I believe is not the same as turbulent Prandtl number
  Reply With Quote

Old   October 3, 2006, 13:12
Default Re: changing model constants in k-e turbulence mod
  #4
opaque
Guest
 
Posts: n/a
Dear Sunil,

It is just a matter of semantics..Prandtl and Schmidt numbers naming is used both ways in the turbulence community..

My personal view is that Prandtl naming is only for heat transfer. Schmidt was meant for mass transfer; however, it is the name for generalized ratio between momemtum transfer/<your physics transfer>

That is the correct parameter.. Be aware that the default value shown in the GUI is not correct.

Good luck, Opaque..

  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
Water subcooled boiling Attesz CFX 7 January 5, 2013 04:32
Turbulence postprocessing Mohsin FLUENT 0 September 19, 2011 22:05
Discussion: Reason of Turbulence!! Wen Long Main CFD Forum 3 May 15, 2009 10:52
Fan heater model: what turbulence source to use? andy20 Main CFD Forum 0 March 2, 2008 13:46
Sinclair Model + secondary turbulence Yi FLUENT 0 October 26, 2001 14:37


All times are GMT -4. The time now is 09:13.