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Old   March 7, 2015, 18:18
Default interFoam Stability Issues
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Darren
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I am trying to simulate an outlet chamber using interFoam but no matter what combination of boundary conditions I choose - I seem to run into a stability issue after a varied amount of time into the simulation.

InterFoam decreases the time step continually until a floating point error occurs. I have based the case set up on the waterChannel tutorial file - but i have tried numerous alternative configurations of boundary conditions and not yet found anything that actually works.

The mesh was constructed using Salome and represents a fairly simple situation where two pumped high velocity inlets enter a small outlet chamber, the chamber is equipped with two simple gravity outlet pipes.

I have included a drop box link to the case files below.

https://www.dropbox.com/sh/m06gbu64j...aBwSqGcfa?dl=0

If anyone out there can shed any light on this - it would make my year.


Thanks
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Old   March 8, 2015, 05:15
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1) You mesh have some non-ortho faces, but you have no correctors in your fvSolution: "nNonOrthogonalCorrectors 0;"
2) It seems that you initial time step is too big, try to reduce it
3) Always check your mesh with checkMesh. In the output have to be no-errors or warnings.
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Old   March 11, 2015, 17:46
Default Stability Issues
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I have tried increasing the number of orthoCorrectors and this helps the simulation limp on a little further.

But I still get the same problem little later in the process.

I have tried adusting the max Courant number and the tolerance in the Fvsolution file - but none of this actually seems enough to push this over the edge and develop a stable solution.

Anyone got any other ideas ?
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Old   March 12, 2015, 03:04
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Try to simulate with "adjustTimeStep no" and small value of deltaT.

Adjusting of the time step in some situation may not work correctly.
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