[Mesa-users] convergence problems in specific mass range
Thomas.Steindl at student.uibk.ac.at
Tue Apr 9 03:13:41 EDT 2019
I think the attachement did not work. I am sorry.
Zitat von Thomas Steindl <Thomas.Steindl at student.uibk.ac.at>:
> Hello everyone,
> I am running the same inlist for masses between 0.5 and 6 solar
> masses with steps of 0.05 solar masses. For some reason, the
> evolution of the 0.55 solar mass model stops after roughly 1800
> steps. All other masses work. If I change the mass to 0.54 solar
> masses, it works (same for 0.56). Therefore, there is something
> weird happening in the mass range around 0.55. I have been looking
> at the temperature, pressure, opacity and density profiles, yet I
> cannot find unexpected behavior.
> To clarify what happens: I am using MESA version r11532. At some
> point MESA starts doing retrys and backups until the timestep is to
> small. Taking a smaller limit for min_timestep_limit does not work
> - it will still stop. I have been checking the output of the newton
> solver - it takes up to 25 iterations at the end until giving up
> either because of average, max resid or tiny corrections.
> Additionally, using things like soften_grad_T do not improve the
> convergence substantially, the evolution just stops a few steps
> I am attaching the inlist. I would appreciate any help for resolving
> this problem. Thank you very much in advance.
> kind regards,
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