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interFoam/interIsoFoam - transient water jet - high velocities at interface

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Old   December 6, 2018, 07:07
Default interFoam/interIsoFoam - transient water jet - high velocities at interface
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I tried to model a transient water jet inspired by the archerfish using ILES in OpenFOAM v1806 with MULES and isoAdvector.

I get very high velocities in some cells at the interface which are higher than the biggest inlet velocity (6 m/s). There are also oscillations behind the jet.

I can get rid of those effects by using RANS. But a lot information about the jet shape gets lost. There are also oscillations in my DES case.

It seems that these oscillations get affected by surface tension.

How can I improve my LES results?

Attached Images
File Type: jpg ILES_0.036_seconds.jpg (86.3 KB, 77 views)
File Type: jpg ILES_0.046_seconds.jpg (99.6 KB, 59 views)
File Type: jpg RANS_wedge_0.056_seconds.jpg (99.8 KB, 44 views)
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interfoam, interisofoam, jet, les, multiphase

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