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

Turbulence vocabulary

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   January 1, 2007, 22:25
Default Turbulence vocabulary
  #1
pvc
Guest
 
Posts: n/a
Hi everyone and happy new year,

I have a simple question today, which is :

Is there any major difference between the entities Reynolds Stress Tensor (RST), Reynolds Stress Model (RSM) and Differential Stress model (DSM)?

My feeling is that authors use numerous names but are talking about the same approach (using a differential equation for each term of the Reynolds Stress tensor). Since nobody until now confimed me that, I post here this.

Regards

pvc
  Reply With Quote

Old   January 2, 2007, 09:03
Default Re: Turbulence vocabulary
  #2
opaque
Guest
 
Posts: n/a
Dear pvc,

They are and they are not..

Reynolds Stress Tensor is the "thing".

Reynolds Stress Model is how you compute the "thing" or RST. For example, the Boussinesq hypothesis allows you to compute RST from the solution of two turbulence scales (k-epsilon, k-omega, k-kL).

Differential Stress Model, is another model of how to compute the RST. This one is based on the solution of a differential transport equation for the RST. Careful that the equation must be treated as a tensor, and not single scalar components. This will save you a lot of trouble when dealing with symmetry planes, and periodic boundaries.

what RST, RSM and DSM have in common is that you are talking about turbulence modeling, and you are trying to find your way to come up with a meaningful result.

Opaque.
  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
Turbulence postprocessing Mohsin FLUENT 2 October 3, 2016 15:18
Turbulence length scale and integral length scale rizhang CFX 2 April 22, 2016 08:22
Question on Turbulence Intensity Eric FLUENT 1 March 7, 2012 05:30
Discussion: Reason of Turbulence!! Wen Long Main CFD Forum 3 May 15, 2009 10:52


All times are GMT -4. The time now is 04:16.