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

turbulent model

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

Reply
 
LinkBack Thread Tools Display Modes
Old   May 4, 2003, 23:33
Default turbulent model
  #1
Michelle
Guest
 
Posts: n/a
hello everyone

Any opinion on suitable turbulent model for highly swirling turbulent flow? Which of the model can capture the velocity structure best?

Thanks
  Reply With Quote

Old   May 5, 2003, 04:27
Default Re: turbulent model
  #2
Holidays
Guest
 
Posts: n/a
k-omega based models; RSM then is pretty good; LES ustimately.

What are you trying to model?
  Reply With Quote

Old   May 5, 2003, 07:03
Default Re: turbulent model
  #3
Michelle
Guest
 
Posts: n/a
Hello there,

Basically I'm modelling corotating disks in non-axisymmetrical enclosure. I can get a solution.. Actually irregradless of the model used, the velocity always converged to a particular solution. However this solution do not tally with the experimental result.. I can only fine-tune the model to suit the experimental result as I can actually get other results for comparison.. (The experiment was carried out by someone else). My question is what is the best model to capture the flow structure of the problem? I'm not really interested in LES as I'm modelling steady flow..
  Reply With Quote

Old   May 7, 2003, 05:57
Default Re: turbulent model
  #4
heydari
Guest
 
Posts: n/a
Dear, I have used k-e models, but not k-w, the realizable and rng forms, givw better results in the whole by my experience. you can check out to see the best, and compare it as a good search...
  Reply With Quote

Old   May 7, 2003, 06:00
Default Re: turbulent model
  #5
Holidays
Guest
 
Posts: n/a
I would try k-w based models (such as SST for example) and then a RSM model (Sarkar Speziale and Gatski for example). The latter should show improved results; what you can do is do a re-start from one of your solution with this upgraded model and compare the evolution of the solution.
  Reply With Quote

Old   May 7, 2003, 06:02
Default Re: turbulent model
  #6
heydari
Guest
 
Posts: n/a
Dear, I have used k-e models, but not k-w, the realizable and rng forms, givw better results in the whole by my experience. you can check out to see the best, and compare it as a good search...
  Reply With Quote

Old   May 9, 2003, 12:14
Default Re: turbulent model
  #7
Adarsh
Guest
 
Posts: n/a
try this: segregated solver + RNG K-epsilon +PISO with neighbour and skewness correction Put a monitor of velocity in swirling zone. If RNG k-e does not converge switch to enhanced wall function but be sure that wall yplus is below 4.0

if still problems are there use Realizablek-e K-w models are for low reynolds no applications and SST for external flow simulations specifically. Hope this helps.

  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
flat plate with turbulent model danielcebrian OpenFOAM 10 November 13, 2014 16:47
Low Reynolds number k-E Turbulent Model Sohail FLUENT 13 December 3, 2013 12:59
LamBremhorst turbulent model J0bouchard OpenFOAM 3 February 21, 2013 10:28
Stability problem due to turbulent dispersion force in a subcooled boiling model Edy OpenFOAM 7 August 10, 2011 12:00
Turbulent SST model fergal CFX 13 November 2, 2010 19:15


All times are GMT -4. The time now is 13:40.