CFD Online Logo CFD Online URL
Home > Forums > Main CFD Forum

help for the oscillation of velocity!!!

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

LinkBack Thread Tools Display Modes
Old   October 7, 2004, 05:52
Default help for the oscillation of velocity!!!
Posts: n/a
Hi friends

I am using the colocated code to solve gas flow through the porous media. But the oscillation of velocity always occurs at the surface of porous media for both 1D or 2D cases.

This is the so-called infamous Rhie-Chow error. In CFX manual, the discussion is as following: "The rhie-chow term is damped at porous interfaces by multiplying by a factor which is small when there are large changes in porosity, and is near to unity otherwise".

I have already tried this method. It doesn't work. To my surprise !!!!, this problem exists for a long time. No open literature is good enough to discuss how to solve this problem.

Have you met this problem before? My treatment for face flux is following the Peric's method: Flux at face of node = Flux_averaging_from_the_ neighbours - pressure_drop_term_at_left_and right_node + pressure_drop_term_at_the_interface.

Are you using the colocated code? Have you some comments or suggestions on this problem.


  Reply With Quote


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
Plotting Radial Velocity and Tangential Velocity in CFD Post ashtonJ CFX 5 July 13, 2015 02:49
help with UDF for contact angle based on contact line velocity gandesk Fluent UDF and Scheme Programming 14 October 29, 2012 14:58
How to calculate Velocity? Kali Sanjay Phoenics 1 May 1, 2006 13:57
Neumann pressure BC and velocity field Antech Main CFD Forum 0 April 25, 2006 02:15
what the result is negatif pressure at inlet chong chee nan FLUENT 0 December 29, 2001 06:13

All times are GMT -4. The time now is 04:52.