[Mesa-users] entropy relaxation for white dwarfs

[Rob Farmer]

Hi
The point of using a small timescale is that you do not want the model to
adapt to its new structure while you are still trying to relax the target
entropy profile. From the point of view of the star you want the entropy
relaxation to be "instantaneous" (or close to).

It seems like an excellent experiment for you to do, see what different
timescales do to your model and whether you think the results are adequate.
Remember there will be some differences between the pre/post imported model
due to differences in the EOS and other microphysics choices between the
codes.

Rob

On Tue, 3 Aug 2021 at 11:35, Akaash Conhye via Mesa-users <
mesa-users at lists.mesastar.org> wrote:

> Hi all,
>
> I'm trying to relax the entropy of a white dwarf taken from a hydro
> simulation. It was successful (at least as far as I know, Ive attached
> profiles demonstrating this) however I used a larger relaxation timescale
> to accomplish it (1d2). I read in the star_job defaults that the timescale
> should be kept to less than a second. My question is this: What is the
> consequence of using a large relaxation timescale? For some reason, using a
> timescale any smaller than 1d-2 results in a model that cannot converge
> once relaxation is over.
>
> Thanks
>
> Akaash
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