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

nutUSpaldingWallFunction - nutSpalartAllmarasWallFunction - Automatic Wall Treatment

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

Reply
 
LinkBack Thread Tools Display Modes
Old   March 5, 2013, 08:40
Default nutUSpaldingWallFunction - nutSpalartAllmarasWallFunction - Automatic Wall Treatment
  #1
Member
 
Dogan
Join Date: Nov 2012
Location: Bochum/Germany
Posts: 42
Rep Power: 4
dogan is on a distinguished road
Hello everyone,

i am currently working on a diffusor case and i am trying to find the best wall function to simulate a centrifugal pump in OpenFOAM. I have tried nutkWallFunction, nutUWallFunction and nutUSpaldingWallFunction. i got pretty good results in especially nutUSpaldingWallFunction.

My turbulence model is kOmegaSST, and i am using openFOAM 2.1.x version.

I have compared the results with CFX kOmegaSST, which uses automatic wall function treatment, and i realised that the OpenFOAM results are as good as CFX results even though nutUSpaldingWallFunction is a continuous wall function treatment.

In this point, i have couple of questions:

1) is there a difference between nutSpalartAllmarasWallFunction (which is used in the earlier versions of OpenFOAM) and nutUSpaldingWallFunction?

2) Is it possible automatic wall treatment in openFoam, and if yes, how?

3) i think the formulation of nutUSpaldingWallFunction is coming from the "Spalding's law of the wall" model, or is there a difference between the formulations of the code and the "law of the wall" theory?

thanks in advance to all of you
dogan is offline   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
Wall treatment with OpenFOAM roby OpenFOAM Running, Solving & CFD 39 May 4, 2015 13:00
Boundary Layer & Wall Treatment GRAUPS OpenFOAM Running, Solving & CFD 1 October 15, 2012 23:16
Wall treatment - RSM turbulence model djack STAR-CCM+ 1 September 12, 2012 10:51
Boundary Layer roughness/ low reynolds wall treatment Luigi_ STAR-CCM+ 1 March 14, 2012 09:40
Wall functions for near wall treatment : k - epsilon model fivos Main CFD Forum 4 April 27, 2011 07:44


All times are GMT -4. The time now is 18:52.