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Oscillating P-residuals

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Old   November 22, 2018, 08:43
Default Oscillating P-residuals
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Kevin Habrock
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Hello
currently I am investigating a rotating tempered cylinder.
First I tried the incompressible and steady case and determined the u+ and y+ values. Now that I am satisfied with the results so far and I wanted to implement the heat exchange into the simulation.
But with the calculations, both with buyantPimpleFoam and buyantSimpleFoam, oscillating P-residuals always occur. I have already changed the fv-scheme (Euler, CrankNicolson 0.5, backward) several times and tried to use more diffuse div-scheme.
Because I have never calculated compressibly, my knowledge is very limited here.
Does anyone have any experience with this kind of problem?

I hope that the information in the appendix is sufficient to help me here and find my bug.

This Simulation was calculated with:
buyantPimpleFoam and gravity

Best regards
Kevin
Attached Images
File Type: jpg fv_scheme_controldict_and_fv_solution.jpg (74.8 KB, 3 views)
File Type: jpg p_andp_rgh.jpg (72.4 KB, 4 views)
File Type: jpg Residual with p.JPG (46.6 KB, 5 views)
File Type: jpg Residual without p.JPG (115.2 KB, 8 views)
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