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Different surface flow values - Incompressible case
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Hi everyone,
I have an incompressible (simpleFoam) MRF case with an axial fan in a tube (see screenshots). I also got realistic solutions but if I ask paraview to give me the surface flow I get different flows at the outlet and at the middle of the outlet tube. The value at the middle of the outlet tube (0.05437 m³/s) is also more realistic than the outlet value (0.0532 m³/s). Why that? Shouldn't it be the same values since it's an incompressible case? I made a slice at both positions and got the flow value via the "Surface Flow" filter. I also enclosed two screenshots of the glyphs mid-tube (glyph_mid.png) and at the outlet (glyph_out.png). Does anyone know what's going on here? Best regards, Frank Ubber |
Does anybody have an idea? How to correctly read out the surface flow or why I have different flow values?
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Dear Frank,
There could be few reasons: - either your case is not fully converged - either your mesh is not good enough and you get some mass loss - either your farfield (cylinder tube) is not a wall boundary condition and you get some inflow/outflow there as well. |
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