Diverging timestep due to turbulence residuals

kjetilbmoe
Wed, 10 Nov 2021 18:55:22 +0000

I have been trying all day to get a 3D TFM simulation to run, but it keeps failing on what seems to be turbulence residuals (and a few times p0). I have run this simulation - or one very similar - a lot of times in 2D already, but this time it is unusually difficult to make it run properly. I have tried numerical schemes (both default and SMART), initial time step, checking initial conditions for pressure and turbulence, and increasing meash small cell tolerance and snap tolerance. I have a feeling that the mesh still might be a problem, or the inlet condition, as I read from the terminal that max allowed velocity is also reached when the timestep plummets. Does somebody have suggestions to what to troubleshoot next, or what might be the possible problem?

And is it so that the cells marked as “small_cell” is actually removed when the solver starts?