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Numerical oscillations in LES due to mesh refinement

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Old   June 14, 2011, 11:10
Default Numerical oscillations in LES due to mesh refinement
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Martin Söder
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Hi all,

I am doing LES simulation of the flow past inlet valves in engines.
And it seems like I get some kind of numerical oscillation at regions where the mesh has been refined.
I have tried both rhoPisoFoam and rhoPimpleFoam the problem is more apparent in rhoPimpleFoam (oscillations in both velocity and pressure) then in rhoPisoFoam (only oscillations in the near wall pressure)

I have tried different schemes and number of correctors with no significant improvement.

Does anyone have an idea what parameters I could check. The mesh is ok according to checkMesh aswell as for the software used to generate it (Fire)

I have attached som figures showing the oscillations aswell as the mesh.

The one showing velocity is rhoPimpleFoam

Best regards
Martin

Pressure fluctation at surface, rhoPisoFoam

Velocity fluctuations in rhoPimpleFoam
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les, mesh problem, oscillation

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