in a very early stage of my CFD I could observe solution artefacts in the z-component of the velocity (the stripes in the solution), Bulk velocity (x-direction) is approx. 30m/s. With ongoing solution process the solution worses and a pronounced pattern in the velocity is visible. I've tried the different solution schemes (upwind, centered, solu), different values for pressure relaxation, gradient calculation (Gauss-Seidel, Least Square), pressure gradient extrapolation, blending ... but nothing helps.
Do you have a hint for me how I can avoid this? The grid may not be the best, but is mostly a regular hex cell grid and all quality criterions are fine:
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Criterion 1: Orthogonality:
Number of bad cells detected: 0 --> 0 %
Criterion 2: Offset:
Number of bad cells detected: 29441 --> 0 %
Criterion 3: Least-Squares Gradient Quality:
Number of bad cells detected: 411 --> 0 %
Criterion 4: Cells Volume Ratio:
Number of bad cells detected: 0 --> 0 %
Criterion 5: Guilt by Association:
Number of bad cells detected: 0 --> 0 %
Kind regards,
Ralf Becker