[Mesa-users] Problems converging low mass stars because of min_timestep_limit

[Inma Moyano]

Hi Francis,

Thank you, it worked for every opacity and net combination. I'll also check
the inlists that you recommended.

Best regards,
Inma

El vie, 15 mar 2024 a las 17:26, Francis Timmes (<fxt44 at mac.com>) escribió:

> hi inma,
>
> i ran your inlist in r24.03.1. while i didn't investigate every
> opacity/net experiment, i found that increasing the mass resolution from
> ~300 cells in your original inlist to ~1700 cells via
>
> ! mesh controls
>       mesh_delta_coeff = 1
>       max_dq  = 1d-3
>
> allows the model to run smoothly to completion:
>
> stop because star_age >= max_age
>     0.2000000000E+10    0.2000000000E+10
>
> you could also explore the inlists from farag et al 2024 at
>
> https://doi.org/10.5281/zenodo.8327401
>
> especially example_1Msun_solar_Z for setups and settings.
>
> fxt
>
>
>
>
> > On Mar 12, 2024, at 5:43 AM, Inma Moyano via Mesa-users <
> mesa-users at lists.mesastar.org> wrote:
> >
> > Dear MESA Users,
> >
> > My name is Inma, a master's student. I am using MESA's version 23.05.1
> on Ubuntu 23.10.
> >
> > I am working on models for low mass stars (0.1, 0.35 and 0.6 Msun),
> testing different sets of opacity tables for low temperatures
> (kap_lowT_prefix = 'lowT_fa05_a09' , 'lowT_Freedman11') and also
> experimenting with the nuclear reaction networks (options 'basic.net', '
> h_burn.net' and 'mesa_49.net').
> >
> > I had no issues using the net 'basic.net', but when I use 'h_burn.net'
> and 'mesa_49.net' some models of 0.35 and 0.6 Msun do not converge due to
> the following error:
> >
> >                                                      dt
> 6.9699513407705602D-09
> >                                      min_timestep_limit
> 1.0000000000000000D-08
> >  stopping because of problems dt < min_timestep_limit
> > terminated evolution: cannot find acceptable model
> > termination code: min_timestep_limit
> >
> > None of my 0.35Msun models converge using any of the two nets or
> opacities. WIth regard to 0.6Msun models, they only converge using
> 'lowT_fa05_a09' opacity, for both nets, but when I change the opacity to
> Freedman11 they don't anymore.
> > Has anyone had this problem before or knows why this is happening? Here
> I attach my inlist_project file and also the net files.
> >
> > Best regards,
> > Inma
> >
> >
> >
> > <h_burn.net><inlist_lowmass_nets><mesa_49.net
> >_______________________________________________
> > mesa-users at lists.mesastar.org
> > https://lists.mesastar.org/mailman/listinfo/mesa-users
> >
>
>
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