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

Pressure correction equation,Ferziger and Peric

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

Reply
 
LinkBack Thread Tools Display Modes
Old   July 14, 2010, 14:29
Default Pressure correction equation,Ferziger and Peric
  #1
Senior Member
 
Join Date: Jun 2010
Posts: 101
Rep Power: 7
Hooman is on a distinguished road
Hi,
I am trying to follow Ferziger and Peric method on implicit pressure and velcoity coupling from page 175 of the book. I know how the method works for finite differences but I need to use finite volumes and collocated grid arrangement and I have a problem with the pressure correction equation (7.39).

My A_P matrix which is the diagonal of the A matrix obtained from discretization of the momentum equation using (1st order UPwind scheme) is equal to A_P= A_E+ A_W+ap and so it contains terms containing velocites at the nodes. So when it comes to the pressure correction equation where you need the derivative of the inverse of A_P ; I'm not sure on how to go on about differenciating that...along with the pressure gradinet term as well...
my guess is to go back to the continuity equation and substitute the u' term that has not been discretized yet and then discretize the whole equation using finite volume methods..??

Please find the attached file for my coefficient of the A matrix for the momentum equation and what I did next to derive the pressure correction equation.

Please help and thank you very much in advance.
Attached Files
File Type: pdf cfd_forum.pdf (87.1 KB, 43 views)
Hooman is offline   Reply With Quote

Old   July 20, 2010, 05:21
Default
  #2
Member
 
lalupp
Join Date: Jul 2010
Location: India
Posts: 37
Rep Power: 7
lalupp is on a distinguished road
Use OPENFVM instead , very easy to understand and modify
Detailed documentation provided
lalupp 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
SIMPLE pressure correction in compressible flows Maarten de Jong Main CFD Forum 7 April 30, 2012 02:23
Preconditioning for Pressure Correction Equation cfd101 Main CFD Forum 1 February 23, 2006 15:34
pressure correction George Main CFD Forum 2 May 21, 2005 12:47
pressure correction and absolure pressure George Main CFD Forum 5 March 22, 2005 07:10
mass flux correction at outflow boundaries Subhra Datta Main CFD Forum 2 November 24, 2003 14:11


All times are GMT -4. The time now is 10:35.