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

Pressure based solver question

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

LinkBack Thread Tools Display Modes
Old   February 2, 2012, 14:50
Default Pressure based solver question
New Member
Join Date: Feb 2012
Posts: 1
Rep Power: 0
Tobiasrpr is on a distinguished road

Regarding the predictor-corrector family of methods (SIMPLE, SIMPLEC etc), can someone tell me the purpose of the velocity predictor step? Are there any methods which are based on only pressure correction, without velocity prediction? Any pointer to relevant literature will be much appreciated.

Tobiasrpr is offline   Reply With Quote

Old   February 2, 2012, 17:52
Senior Member
Join Date: Aug 2011
Posts: 251
Rep Power: 7
leflix is on a distinguished road
Hi Tobias,

Start to have a look to this here

then read the book of patankar
"numerical heat transfer and heat flow"

and follow with
"Computational fluid dynamics" from Ferziger-Peric

You will find your answers.

For incompressible flows velocity and pressure are deeply coupled. You can not correct one without correcting the other.
leflix is offline   Reply With Quote

Old   February 3, 2012, 13:05
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 1,779
Rep Power: 23
FMDenaro will become famous soon enough
As said, pressure in incompressible flows is not a thermodinamic variable and you have no equations governing it (it is a Lagrangian multiplier)... as well, scalar pressure is not a variable to be solved, you need to solve for a gradient of a suitable scalar function that ensures the divergence-free constraint. Solving for the "pressure" equation is therefore equivalent to solve the continuity equation. The relation between such a gradient and the real pressure gradient depends on the method.
FMDenaro is online now   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
Calculation of the Governing Equations Mihail CFX 7 September 7, 2014 06:27
Pressure Outlet Guage pressure Mohsin FLUENT 34 January 12, 2012 06:45
density based solver and energy ashka FLUENT 0 May 3, 2010 05:46
Question abt. the Riemann analytic solver jinwon Main CFD Forum 0 July 16, 2007 14:11
Gas pressure question Dan Moskal Main CFD Forum 0 October 24, 2002 22:02

All times are GMT -4. The time now is 10:52.