[Mesa-users] a problem of the relaxation

[Pablo Marchant]

Hi Yaotian,

in order to help you with your problem we need enough information to
reproduce it, including all inlists and input files attached to the email.
>From your email I'm also not sure if your simulation succeeds in relaxing,
but then fails to evolve further.

Cheers

On Mon, Jun 8, 2020 at 4:34 PM 曾耀田 <zengyaotian at ynao.ac.cn> wrote:

> Hi Francis,
>
>
> Thanks for your reply.
>
> I want to map 3D models to MESA. Therefore the first step I already have
> done is to convert 3D models into 1D models. However, these 1D models are
> out of hydrostatic equilibrium. To obtain 1D models that are in the
> hydrostatic equilibrium, I am trying to relax them for several dynamical
> timescales until the velocity and acceleration of each cell of a star are
> small enough. Considering I am not familiar with MESA, what is doing now is
> to relax the model that MESA itself can run to learn how to relax a star.
>
>
> Best wishes
> Yaotian Zeng
>
> > -----原始邮件-----
> > 发件人: "Francis Timmes" <fxt44 at mac.com>
> > 发送时间: 2020-06-08 07:57:33 (星期一)
> > 收件人: "曾耀田" <zengyaotian at ynao.ac.cn>
> > 抄送: "Frank Timmes" <fxt44 at mac.com>, mesa-users <mesa-users at lists.
> mesastar.org>
> > 主题: Re: [Mesa-users] a problem of the relaxation
> >
> > hi yaotian,
> >
> > it would be useful to know what you are trying to achieve,
> > in addition to how you tried to achieve it. what is the goal?
> >
> > fxt
> >
> >
> >
> >
> > > On Jun 7, 2020, at 3:03 AM, 曾耀田 <zengyaotian at ynao.ac.cn> wrote:
> > >
> > > 2020-06-07 17:52:11"曾耀田" <zengyaotian at ynao.ac.cn>写道：
> > >
> > >
> > > Dear all,
> > >
> > >
> > >
> > > I'm sorry to bother you, but for some reason the information in this
> letter is missing. I am new to MESA. I am trying to relax a model of a 1.5
>  solar mass star based on the result (final.mod) of 1.5M_with_diffusion in
>  test_suite directory. To do this, as same as the example
> ofrelax_composition_j_entropy in the test_suite directory, I try to relax
> composition and entropy (but using get_entropy_for_relax_from_eos = ‘eosDT
> ', see details below). It can run some steps but always ended with the
> error of dt < min_timestep_limit. I have tried to set different values for
>  the comments in the inlist (shown below) but failed (e.g. changing the
> values of min_timestep_limit to 1d-30). I don't understand that even the
> input model has exactly the same entropy, density, and temperature
> profiles as the 1.5 solar mass star already had, the relaxation still
> doesn't work. So I try to understand the meaning of adjusting the values
> of these commands through the .defults file but I still don't have a clue
> . Now I am unsure of how and what parameters to adjust. Any ideas,
> suggestions, or help would be greatly appreciated!
>
>
> ------------------------------
>
> 祝好！
>
> 曾耀田
> _______________________________________________
> mesa-users at lists.mesastar.org
> https://lists.mesastar.org/mailman/listinfo/mesa-users
>
>

-- 
Pablo Marchant Campos
M.Sc on Astrophysics, Universidad Católica de Chile
PhD on Astrophysics, Argelander-Institut für Astronomie, Universität Bonn
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