[Mesa-users] Building He layer in ns_h test suite problem

[David Neto]

Hello Frank,

Thanks for the update. I just wanted to make sure I wasn't missing
something.

Cheers,
David

On Tue, Dec 5, 2023, 3:16 PM Frank Timmes <fxtimmes at gmail.com> wrote:

> hi david,
>
> interesting observation.
>
> this test suite case dates from ~2012 and version 4161 when mdot was 1e-11
> msun/yr with a 0.75 h, 0.24 he composition. by version 12778, mdot was
> 1.7e-11 msun/yr with the same composition. starting with version 15140 the
> single inlist was split into multiple inlists with the first being the
> buildup of a he envelope with  mdot = 1e-9 msun/yr.
>
> i cannot locate or remember a reason for this last value of mdot, but
> maybe someone can correct me. i doubt it was to stress test parts of mesa.
>
> fxt
>
>
>
>
> > On Dec 5, 2023, at 1:30 PM, David Neto via Mesa-users <
> mesa-users at lists.mesastar.org> wrote:
> >
> > Hello all,
> >
> > In the ns_h test suite problem during the first part of the simulation
> (inlist_add_he_layer), was there a specific reason or motivation for the
> accretion rate used during this part of the simulation? With the default
> values, Mdot is 1E-9 Msun/yr, and you simulate for 0.5 seconds, which gives
> lots of retries and a fairly long compute time when run. If one cuts mdot
> in half and doubles the simulation time (so, building up the same outer
> helium layer mass), the number of retries and computation time drops
> dramatically. This is all in preparation for the second step, testing
> steady hydrogen burning.
> >
> > I was just wondering if this choice of parameters in the test suite was
> to "stress test" parts of MESA or if there was another astrophysical reason
> for the choice of mdot and simulation time.
> >
> > For reference, this is using MESA version 23.05.1 and MESA SDK version
> 22.6.1.
> >
> > Cheers,
> > David
> >
> >
> > _______________________________________________
> > mesa-users at lists.mesastar.org
> >
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