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

pressure correction

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

LinkBack Thread Tools Display Modes
Old   May 13, 2005, 07:59
Default pressure correction
Posts: n/a
Hi everybody. I have a quastion about my code.I simulate compressible unsteady turbulent flow and I want to ask you exactly how I implement the pressure correction (SIMPLE-like algorithm for compressible flow).What is the difference with the pressure correction in incompressible flow? Thank you!
  Reply With Quote

Old   May 13, 2005, 08:37
Default Re: pressure correction
Posts: n/a
You will need to incorporate the variation of density with pressure in the continuity equation, i.e. the pressure correction you solve for will be a function of the velocity perturbations and density fluctuation. This is usually done by appealing to the thermodynamic relation rho = rho(p,h) and assuming the enthalpy is fixed during the outer iterations so that one can approximate drho/dt ~ (drho/dp)*dp/dt. In addition, the enthalpy equation is solved along with the momentum equations to give approximations to (u,v,h). Then the pressure correction equation is solved and the quantities are updated as appropriate. More on this can be found in Peric and Ferziger, pp. 278-287.
  Reply With Quote

Old   May 21, 2005, 12:47
Default Re: pressure correction
Larry Clark
Posts: n/a
In my program I found that upwinding the pressure and density using the Mach number helped greatly with the stability of the method. It added to the calculations but it is worth it. Otherwise I did just what the previous comment suggested.
  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
changing the coefficients of pressure correction Noel Phoenics 1 April 7, 2009 08:54
Does star cd takes reference pressure? monica Siemens 1 April 19, 2007 11:26
Pressure correction scheme in axissymmetric model Adam Wu Main CFD Forum 0 September 30, 2005 11:45
residual in the pressure correction George Main CFD Forum 2 July 28, 2005 04:43
a problem about pressure correction method tommewang Main CFD Forum 2 May 15, 2003 21:18

All times are GMT -4. The time now is 01:47.