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

SST K- omega turbulence model

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   September 6, 2011, 03:33
Default SST K- omega turbulence model
  #1
Senior Member
 
Mehdi Baba Mehdi
Join Date: Jan 2011
Posts: 158
Rep Power: 15
mb.pejvak is on a distinguished road
Hi
I want to apply SST K- omega turbulence model (menter 1994) in my code. in Omega equation it has one term that called 'cross diffusion term'. I don't know how to discretize this equation. in that paper Menter recommended a linearization but I can't understand it (zonal two equation K-Omega turbulence model for aerodynamic flow, Menter, 1993, formula 27 & 28). Does any one know what should I do?

thanks a lot
mb.pejvak is offline   Reply With Quote

Old   September 6, 2011, 11:23
Default
  #2
New Member
 
Eezyville's Avatar
 
Chris
Join Date: Oct 2010
Location: Toledo, OH
Posts: 24
Rep Power: 15
Eezyville is on a distinguished road
Send a message via Skype™ to Eezyville
Did you try looking at other resources for clues. Here's a link to NASA's website on turbulence models. http://turbmodels.larc.nasa.gov/sst.html

I hope it can be helpful to you.
Eezyville is offline   Reply With Quote

Old   September 6, 2011, 11:34
Default
  #3
Senior Member
 
Mehdi Baba Mehdi
Join Date: Jan 2011
Posts: 158
Rep Power: 15
mb.pejvak is on a distinguished road
Dear Eezyville
thanks for your advice. yes I did. but in that site nothing was said about discritization of cross diffusion term of this model. as I said in the paper of Menter recommended a way but I can't understand it.
mb.pejvak is offline   Reply With Quote

Old   September 12, 2011, 16:31
Default
  #4
Member
 
Zachariah Swetky
Join Date: Aug 2011
Posts: 36
Rep Power: 14
swetkyz is on a distinguished road
mb.pejvak,

If you are already computing the partial derivatives of k and omega with respect to x_j to solve Eqns. (5) and (6) from Menter 1994, then why not simply multiply them to compute your cross-diffusion term?

Out of curiosity, what is your motivation for implementing the Menter SST model yourself instead of using preexisting software (e.g. openFoam)?

-Zachariah

Last edited by swetkyz; September 13, 2011 at 09:11. Reason: Clarity
swetkyz is offline   Reply With Quote

Old   September 13, 2011, 06:18
Default cross diffusion term
  #5
Member
 
lalupp
Join Date: Jul 2010
Location: India
Posts: 44
Rep Power: 15
lalupp is on a distinguished road
Check the code freecfd. It is a free c++ code in which cross diffusion term has been implemented. It is in the rans module. Code is not very difficult to understand
lalupp is offline   Reply With Quote

Old   September 15, 2011, 23:03
Default
  #6
Senior Member
 
Mehdi Baba Mehdi
Join Date: Jan 2011
Posts: 158
Rep Power: 15
mb.pejvak is on a distinguished road
Dear Zachariah
I can't understand what you mean. but if you said that I should multiply derivation of k to omega I know that, but I want to descritize it with finite volume and with using of Green law a logarithmic function will be earned and it's impossible to apply this term implicitly.
and about your another question I want apply this turbulence model in self- developing code and It has good answer in laminar flow and I want to use it in turbulent regime.

Mehdi
mb.pejvak is offline   Reply With Quote

Old   September 15, 2011, 23:08
Default
  #7
Senior Member
 
Mehdi Baba Mehdi
Join Date: Jan 2011
Posts: 158
Rep Power: 15
mb.pejvak is on a distinguished road
Dear lalupp
thanks for your helping, but I couldn't find that code you recommended. could you please give me its address or name of site that it is there?

Mehdi
mb.pejvak is offline   Reply With Quote

Old   September 16, 2011, 01:11
Default Cross diffusion term
  #8
Member
 
lalupp
Join Date: Jul 2010
Location: India
Posts: 44
Rep Power: 15
lalupp is on a distinguished road
Pls see http://www.freecfd.com/ register and download
lalupp is offline   Reply With Quote

Old   September 16, 2011, 09:52
Default
  #9
Member
 
Zachariah Swetky
Join Date: Aug 2011
Posts: 36
Rep Power: 14
swetkyz is on a distinguished road
Medhi,

Thank you for clarifying. I had assumed that you were using a finite difference method.
swetkyz 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
multiphaseInterFoam for RAS turbulence model chiven OpenFOAM Bugs 8 December 6, 2017 03:08
Huge Heat Transfer Coefficient with SST turbulence model andoss CFX 4 January 9, 2010 08:40
Understanding k-omega SST model source code tmhonka OpenFOAM Programming & Development 1 September 8, 2009 08:33
SST transitional turbulence model Ben Akih CFX 3 June 8, 2006 16:52


All times are GMT -4. The time now is 04:28.