Trying to simulate airflow around a 60 mm spinning disc with deep grooves embedded in outer periphery of disc.
The project-run (Run #3) errored out due to excessive divergence after 12 percent completion. “Velocity field started diverging. Please check the mesh quality near the reported location and try refining the mesh. If the problem occurred near a boundary, please check the boundary conditions. In case of doubt, please ask for assistance via our support chat. Velocity = 9.46272e+07 at position: (0.02224 m, 0.007489 m, 0.1437 m).”
Error log mentions speeds of 9.4 e+07 meters/second, but that number (over 9 million met/sec) is not near the actual simulation speed of the MRF rotating zone — (1000 rad/sec with tips at 0,030 meter radius giving an MRF rotation zone speed of only about 30 met/sec).
Yes, that helped. My meshes were apparently fine as they were, so I lowered the relaxation factor for velocity from 0.7 to 0.5 on both this model and another model that diverged, and that solved both cases.
Just to clarify, in order to keep the pressure plus velocity relaxation sum between 0.9 and 1.1 (as recommended in your documentation), I also increased the “pressure relaxation factor” from 0.3 (standard) to 0.4. Changing these factors solved this problem. Thanks again.
