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

Rhie-chow interpolation

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

Reply
 
LinkBack Thread Tools Display Modes
Old   November 19, 2009, 13:05
Question Rhie-chow interpolation
  #1
New Member
 
Join Date: Nov 2009
Posts: 3
Rep Power: 9
anya is on a distinguished road
Hello!

I'm trying to develop a code that solves flow problems on collocated grids, using a SIMPLE-type algorythm and Rhie-Chow interpolation of face values from cell center values. It is something like:
http://www.cfd-online.com/Wiki/Rhie-Chow_interpolation .
I have a misunderstanding: what to do in case a_p=0?
How to interpolate then?


Thanks in advance!
anya is offline   Reply With Quote

Old   November 24, 2009, 13:28
Default
  #2
Senior Member
 
ztdep's Avatar
 
p ding
Join Date: Mar 2009
Posts: 312
Rep Power: 10
ztdep is on a distinguished road
Send a message via Yahoo to ztdep Send a message via Skype™ to ztdep
ap=0? could you please tell me how did you get this result. It is impossible to get a 0
ztdep is offline   Reply With Quote

Old   November 24, 2009, 18:55
Default
  #3
New Member
 
Join Date: Nov 2009
Posts: 3
Rep Power: 9
anya is on a distinguished road
Quote:
Originally Posted by ztdep View Post
ap=0? could you please tell me how did you get this result. It is impossible to get a 0
Thank you for your reply!
imagine such a model case: invisid flow, say using the 1st order upwind scheme, say two flows equal in magnitude but opposite in direction, then in the region where they meet we have such a situation in computation
Here, just read this opportunity I trust trading platform
anya is offline   Reply With Quote

Old   December 18, 2009, 16:15
Default
  #4
New Member
 
Join Date: Nov 2009
Posts: 3
Rep Power: 9
anya is on a distinguished road
Sorry, but couldn't anyone really explain please, why anywhere where Rhie-chow interpolationis described, the possibility when a_p or other coefficient (that can be seen in the denominator) equals zero, isn't regarded though it may really take place?
Thanks in advance!
anya is offline   Reply With Quote

Old   December 18, 2009, 20:34
Default
  #5
Senior Member
 
ztdep's Avatar
 
p ding
Join Date: Mar 2009
Posts: 312
Rep Power: 10
ztdep is on a distinguished road
Send a message via Yahoo to ztdep Send a message via Skype™ to ztdep
Quote:
Originally Posted by anya View Post
Sorry, but couldn't anyone really explain please, why anywhere where Rhie-chow interpolationis described, the possibility when a_p or other coefficient (that can be seen in the denominator) equals zero, isn't regarded though it may really take place?
Thanks in advance!
ztdep@yahoo.com.cn comtanct me.
ztdep is offline   Reply With Quote

Old   December 19, 2009, 05:56
Default
  #6
Member
 
Mohammad Reza Hadian
Join Date: Mar 2009
Location: Yazd, Iran
Posts: 52
Rep Power: 9
hadian is on a distinguished road
Quote:
Originally Posted by anya View Post
Sorry, but couldn't anyone really explain please, why anywhere where Rhie-chow interpolationis described, the possibility when a_p or other coefficient (that can be seen in the denominator) equals zero, isn't regarded though it may really take place?
Thanks in advance!
i do not know about your case, but if it happens, the condition |a_p|\geq\sum|a_{nb}| will not be satisfied and you can not solve the equations based on the patankar rules.
hadian 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
Rhie and Chow James Houghton Main CFD Forum 0 October 9, 2005 07:02
Rhie & Chow method/flame propagation? yang Main CFD Forum 0 May 19, 2005 08:00
Rhie - Chow Interpolation ? Javier Goicochea Main CFD Forum 0 November 27, 2003 19:01
Rhie - Chow speed up factors Goicox Main CFD Forum 0 November 22, 2003 01:00
Rhie & Chow interpolation Barry Main CFD Forum 3 January 20, 2003 10:11


All times are GMT -4. The time now is 21:34.