[Mesa-users] Limiting the final radius of a simulation

[Francis Timmes]

hi ali,

one controls the precision of a stopping condition with 

https://docs.mesastar.org/en/release-r22.11.1/reference/controls.html#when-to-stop-rtol

and

https://docs.mesastar.org/en/release-r22.11.1/reference/controls.html#when-to-stop-atol


> I realize that one could decrease the timesteps of evolution ...

this is what mesa does, just automatically until the given precision is reached.

fxt




> On Feb 15, 2023, at 11:24 AM, Ali Pourmand via Mesa-users <mesa-users at lists.mesastar.org> wrote:
> 
> Hello,
> 
>  I want to stop several different MESA runs at the same final (photospheric) radius (with a certain precision), but since the physics is slightly different in each, I can't stop at the exact same radius. I realize that one could decrease the timesteps of evolution to achieve this, but was wondering if there is an easier way to achieve this.
> 
> I am already using the stop to limit the photospheric radius command, but it always stops with a certain precision.
> 
> What I want is a way to tell the code to stop when the photosphere reaches 7+-0.01 solar radii , is there any command that could achieve that? I tried delta_lgR_limit, but I don't think that does what I have in my mind.
> 
> best
> Ali Pourmand
> M.Sc. Student
> University of Alberta
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