[Mesa-users] A Problem About Overshooting Parameters

[Radek Smolec]

Dear Guo Boyang,

There are two schemes in MESA to treat overshooting, step and exponential.
You have used an exponential scheme, but the values of f parameters are
more appropriate for step overshooting.

For exponential overshooting, to get the same effect, you need to set f_exp
approximately as 0.1 f_step.

For your case case just change the scheme from exponential to step. If you
want exponential, f values must be smaller.
Best wishes,
Radek



sob., 19 lis 2022 o 06:00 郭博洋 <20191050087 at mail.ynu.edu.cn> napisał(a):

> Dear MESA users,
>
> I am trying to use mesa to reproduce a previous work about the progenitors
> of white dwarf. In this work the author had set a parameter δ_ov about the
> overshooting stage, which I could not find a proper parameter corresponding
> to it in MESA. The relevant parts of the paper are shown below：
>
> We set α = l/H p , the ratio of typical mixing length to the local
> pressure scaleheight, to 2, and set the convective overshooting parameter δ
> ov to 0.12 (Pols et al. 1997; Schröder, Pols & Eggleton 1997), which
> roughly corresponds to an overshooting length of ∼0.25 pressure
> scaleheights (Hp).
>
> I tried to set the parameters overshoot_f and overshoot_f0 to 0.3 and 0.05
> to make the overshooting length matches 0.25 pressure scaleheights.
> However, this value is obviously much too large for a star with 2.4 solar
> mass. So I was wondering what is the proper way to set this parameter. I
> will attach my inlists file and the screenshots of the article. The version
> of my software is r22.05.01.
>
> I would appreciate it if someone could help me solve the problem.
>
> Best wishes!
>
> Yours sincerely,
> Guo Boyang_______________________________________________
> mesa-users at lists.mesastar.org
> https://lists.mesastar.org/mailman/listinfo/mesa-users
>
>
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