CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > CFX

Reynolds Stress Models

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

LinkBack Thread Tools Search this Thread Display Modes
Old   February 1, 2000, 16:38
Default Reynolds Stress Models
Posts: n/a
Hi, every one

I have e general question about using the Reynolds Stress models (RSM and ASM) within CFX.

When simulating air flow in ventilated enclosures like a building or a room, the quality of the prediction made by the Reynolds Stress models are poor compared to the two-equations model like k-eps, low-Reynolds k-eps or the low-Reynolds k-omega models. (Comparing velocity profiles, between different turbulence model and experiments).

The flow is in general low-Reynolds (RE approx. 4000-5000). Room has slot inlet and outlet in full width of the room.

Why does the RSM make such a poor prediction ???

Any hints ???

Only standard parameter are used both in the Reynolds Stress Model and the other two-equations models.

Thanks in advance.

Best Regards

  Reply With Quote

Old   February 2, 2000, 10:45
Default Re: Reynolds Stress Models
ahmadreza hosseinkhani
Posts: n/a
hi dear friend probably, you must be use the near wall corrected R.S. model

thank you

a.r. hossenkhani Ph.D. student of hydraulic civil eng.
  Reply With Quote

Old   February 7, 2000, 11:33
Default Re: Reynolds Stress Models
Posts: n/a
Hi Roued,

Is your question about RSM within the context of CFX or in general? If it's general and you want to know why RSM is poor compared to other models, then I can share some of my knowledge with you. I have used CFX once and I don't remember it now(as I don't have the code). I had a course in turbulence and during that time I came to understand some of the aspects of turbulence. The very basic deficiency of RSM is the "closure". We don't have any clear physical understanding of the problem in concern in order to close the unknowns that RSM introduces thro' averaging. That's why it works well for some problems and fails in some others. gita
  Reply With Quote


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
New implemented algebraic Reynolds stress model volker OpenFOAM 13 October 21, 2013 01:01
Reynolds Stress Models Jade M Main CFD Forum 0 April 21, 2010 17:38
Compressible Reynolds Stress Models cosimobianchini OpenFOAM Running, Solving & CFD 0 August 24, 2007 07:13
Reynolds Stress Models amelia OpenFOAM Running, Solving & CFD 1 August 11, 2005 18:12
Reynolds Stress Models Roued Main CFD Forum 20 February 8, 2000 03:58

All times are GMT -4. The time now is 10:49.