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InterFoam for open channel: Time step divergence

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Old   November 29, 2021, 09:01
Default InterFoam for open channel: Time step divergence
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Hi everybody,

I'm trying to simulate open channel flow using InterFoam solver. When I set up the case with a simplified geometry (see below), the simulation runs without problem. Now for the real geometry, that includes a bend and a culvert section, the time step immediately diverges and the solution blows up. The boundary conditions for the two cases are identical and checkMesh results only in 1 failure (20 skewfaces) for the second case with complex geometry.

Any idea what possibly went wrong during upscaling?
Thanks a lot for your inputs, very much appreciated!
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File Type: png simplified_case.png (105.4 KB, 15 views)
File Type: png case_complex_geometry.png (56.0 KB, 15 views)
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interfoam, upscale, velocity and pressure

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