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

Turbulence modeling for a flat plate

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   May 20, 2009, 15:55
Default Turbulence modeling for a flat plate
  #1
Member
 
Join Date: Apr 2009
Posts: 78
Rep Power: 17
tstorm is on a distinguished road
I'm doing a validation study for a user-defined v2-f turbulence model in FLUENT. I used the empirical laminar flow equation for skin friction: 0.664/sqrt(Re_x) to compare results for several turbulence models. y+ is around 1.

I'm finding that Spalart-Allmaras, k-epsilon, realizable k-epsilon, k-epsilon RNG, k-omega, and k-omega SST all overpredict the skin friction coefficient by 20-50%. Interestingly enough, the v2-f models predict nearly identical skin friction coefficient distributions as the empirical equation.

I have a 2 questions:
1. Why do the standard models over predict Cf for such a simple flow?
2. Is this typical for these models?
tstorm 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
Discussion: Reason of Turbulence!! Wen Long Main CFD Forum 3 May 15, 2009 09:52
May Focus Area: Turbulence Modeling Jonas Larsson CFD-Wiki 0 May 2, 2006 11:48
Seperated Flow and Turbulence modelling flat plate Simon Mizzi Main CFD Forum 1 December 16, 2003 01:26
Turbulence dead? well... can somebody help me with a flat plate meanwhile? Javier Main CFD Forum 2 May 23, 2000 04:41


All times are GMT -4. The time now is 09:59.