|August 3, 2006, 13:50||
Hi, I am working on simulat
Join Date: Mar 2009
Location: Ames, Iowa, USA
Posts: 16Rep Power: 9
I am working on simulating swirling flow through a nozzle. I have been able to run steady-state incompressible flow using simpleFoam, but when I attempt to run the same geometry compressibly using rhoSimpleFoam the pressure goes negative.
I am using:
- Atmosphere BCs at inlet and outlet (totalPressure and pressureInletOutletVelocity)
- Default discretization except div(phi,U) which is limitedLinearV 1.0
- Cyclic boundary conditions
- Relatively low under-relaxation factors (0.2 p, 0.4 U, 0.1 k, eps, h, and rho)
Varying these parameters changes when the pressure goes negative, but it always does at some time or another. The blowup appears in a straight channel portion of the domain where a region of low pressure will move upstream, followed by high pressure, then low, etc. There seems to be no effect on velocity that I can see as a result of these pressure oscillations.
I am just about out of ideas as to what could be causing this. Does anyone know what might be wrong and what I can do to fix it? I'd appreciate any advice you can give.
|Thread||Thread Starter||Forum||Replies||Last Post|
|RhoSimpleFoam||maritozzo||OpenFOAM Running, Solving & CFD||1||April 30, 2010 18:18|
|RhoSimpleFoam problem with patch||nishant_hull||OpenFOAM Running, Solving & CFD||15||October 30, 2009 13:51|
|RhoSimpleFoam||jphandrigan||OpenFOAM Running, Solving & CFD||18||March 29, 2009 11:05|
|Problem with rhoSimpleFoam||matteo_gautero||OpenFOAM Running, Solving & CFD||0||February 28, 2008 07:51|
|RhoSimpleFoam||luca||OpenFOAM Running, Solving & CFD||0||August 22, 2005 12:26|