[Mesa-users] How do you change timestep in MESA?

[Bea Marie Cajandig]

Good day Mr. Timmes,

I tried the inlist, and the error that displayed before did not appear
anymore; the run was completed. Thank you helping me figure this out. Will
do what you suggested in the previous email.

Regards to the MESA Developers and Community. Looking forward to more
advancement for MESA. Thank you once again.


Cheers,
Bea

On Tue, Oct 13, 2020, 5:03 AM Francis Timmes <fxt44 at mac.com> wrote:

> hi bea,
>
> the essence of this case is low mass, m = 0.12 msun, at high
> metallicities, z=0.03.
> i have been unable to get this to run in 12778. about halfway down the
> pre-ms
> track the density corrections for cell 1 become large and alternating in
> sign.
> this is what drives the timestep to small values. however, the model does
> run
> at smaller metallicities, z < 0.02. so for now, unless someone else offers
> a solution,
> you'll have to restrict the metallicity range of your study.
> attached is my inlist.
>
> on a more positive note, this case runs fine in recent developer versions.
> maybe there will be a new public release one of these days ...
>
> fxt
>
>
> p.s. always cc mesa-users in your replies please.
>
>
>
>
>
> > On Oct 4, 2020, at 6:53 PM, Bea Marie Cajandig <bmhcajandig at gmail.com>
> wrote:
> >
> > Hello Mr. Timmes,
> >
> > Thank you for the response. I'll be attaching my inlists Sir. Pardon as
> my inlists are still a mess at this point, I am still learning how to use
> MESA.
> >
> > Again, thank you for helping me out Mr. Timmes. I have been following
> your tutorials on YouTube, and they are of very great help.
> >
> >
> > Regards,
> > Bea
> >
> > On Mon, Oct 5, 2020 at 2:52 AM Francis Timmes <fxt44 at mac.com> wrote:
> > hi bea,
> >
> > generally it means a model was unable to evolve despite trying tiny time
> steps.
> > decreasing the minimum time step is unlikely to be a solution, but not
> enough
> > information is provided for anyone to potentially help.
> > best practice is to at least share the inlist(s) one is using.
> >
> > fxt
> >
> >
> >
> > > On Oct 4, 2020, at 9:01 AM, Bea Marie Cajandig via Mesa-users <
> mesa-users at lists.mesastar.org> wrote:
> > >
> > > Good day to all,
> > >
> > > I am running a simulation on a red dwarf star, and it is always
> terminated with this message:
> > >
> > > "stopping because of problems dt < min_timestep_limit
> > > terminated evolution: cannot find acceptable model
> > > termination code: min_timestep_limit"
> > >
> > > I would like to ask a few questions in regards to this:
> > > 1. What does this error mean?
> > > 2. Where is the timestep adjusted? Where do you add the timestep
> value: &star_job or &controls?
> > >
> > > Thank you in advance for helping me out. The help is very much
> appreciated.
> > >
> > > Cheers,
> > > Bea
>
>
>
>
>
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