[Mesa-users] convergence problems in specific mass range

Thomas Steindl 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  
> later.
>
> I am attaching the inlist. I would appreciate any help for resolving  
>  this problem. Thank you very much in advance.
>
> kind regards,
> Thomas
>


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