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

Pressure vs. Density based

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

Reply
 
LinkBack Thread Tools Display Modes
Old   April 29, 2007, 11:12
Default Pressure vs. Density based
  #1
jan
Guest
 
Posts: n/a
Dear all, I am calculating a compressible flow, a straight nozzle with high pressure at inlet. I am a mass flow inlet. What confuses me is that I get different results when using the pressure or density (coupled) based solver. All the settings are the same except selection of the solver. With the pressure solver I predict a Mach number on 1.4 at the inlet and with the density based is the Mach number 0.9. Hence velocity and pressures at the inlet face is also different.

Both solvers should give the same results if the solution is converged and it is.

Any clue/help

Regards Jan

  Reply With Quote

Old   May 2, 2007, 15:12
Default Re: Pressure vs. Density based
  #2
Ahmet
Guest
 
Posts: n/a
Hi,

I study also in a laval nozzle with high pressure inlet and also I have the same question. Did you have any answer for your problem.

  Reply With Quote

Old   May 3, 2007, 03:45
Default Re: Pressure vs. Density based
  #3
John
Guest
 
Posts: n/a
I did not get an answer on CFD online, but I have been told that it has to do with the interpolation scheme for the 2 solvers. A finere grid is required for the pressure based solver and if difference is seen in the results then it is probably due to a too coarse grid, no mesh independancy

  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
Problem with rhoSimpleFoam : exploding enthalpy and density at the walls david39 OpenFOAM Running, Solving & CFD 6 January 18, 2011 12:49
regarding density and pressure based solver Reddy CFX 3 October 11, 2007 03:08
Neumann pressure BC and velocity field Antech Main CFD Forum 0 April 25, 2006 02:15
Hydrostatic pressure in 2-phase flow modeling (CFX4.2) HB &DS CFX 0 January 9, 2000 14:19
Density based codes? H.S.Muralidhara Main CFD Forum 3 May 28, 1999 06:29


All times are GMT -4. The time now is 21:55.