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Hello everyone,

what I did until now:
3D structure build with ProE --> exported as IGES/STEP
Imported with Netgen-4.9.13 and meshed with option very fine --> exported as Neutral Format
Imported with netgenNeutralToFoam (openfoam-2.0.0)
copied files from ... /compressible/rhoPimpleFoam/ras/angledDuct (edited a little bit the patches and names of the patches)

The way I set up my boundary conditions: (http://netload.in/dateiOF69C1QR0g/20110808r1.tar.gz.htm ~134 KB) (it's a little bit bigger file size than ~97.7 KB because of compatibility with openFOAM 1.7.1 and 2.0.x.)

These are the boundary conditions I want to set:
inlet is open to the atmosphere (athmospheric pressure 101325 Pa, inlet flow 0.000020833 Kg/s)
Outlet0 and 1 are connected to a low pressure pump. The pressure for each outlet is 1000Pa.
Temperature doesn't matter, so I set the inlet entry to 273.15 K and the other ones to zeroGradient.

I've tried it with openfoam-1.7.1, 2.0.0 and 2.0.1, laminar and turbulent settings edited relaxation factors, used rhoSimpleFoam and rhoPimpleFoam --> nothing worked for my case. I got always sooner or later a floating point exception.

My questions are:
1) Is it possible at all to solve low- or high-pressure problems with rhoSimpleFoam, rhoPimpleFoam?
2) What is the problem in my case?

Hope you can help me with my case.

Many thanks for your attention and best regards
Hauke

[eric.m.tridas]

Hello Hauke,

I am working on a similar problem analyzing the air flow into a vacuum chamber through a 20 mil capillary. My inlet and outlet pressures are very similar to yours. I am interested in how this goes for you as I am having similar problems getting my model to work.

-Eric

[umer.chaudrey]

What is the Courant Number, MaxCo and deltaT (time step) you are using? for rhoPimpleFoam