[Mesa-users] A question about rotational mixing for binary models

[Pablo Marchant]

Hi,

seems your inlists do not have rotation turned on, so no rotation effects
will take place. An example of a binary model with tides is in the test
case located at $MESA_DIR/binary/test_suite/double_bh. Things you can
include from there are (you can look for explanations for these options in
the defaults files for the star and binary modules):

- for inlist project, section &binary_controls:

    do_tidal_sync = .true.
    do_j_accretion = .true.
    sync_mode_1 = "Uniform"
    sync_type_1 = "Hut_rad"
    Ftid_1 = 1
    sync_mode_2 = "Uniform"
    sync_type_2 = "Hut_rad"
    Ftid_2 = 1
    do_initial_orbit_sync_1 = .true.
    do_initial_orbit_sync_2 = .true.

- and the more relevant one, turn on rotation in &star_job for both inlist1
and inlist2:

     new_rotation_flag = .true.
     change_rotation_flag = .true.
     set_initial_surface_rotation_v = .true.
     ! this is just a random number, tidal sync takes care of it
     new_surface_rotation_v = 50

Cheers

On Wed, Jan 4, 2023 at 10:00 PM Yamaguchi, Natsuko <nyamaguc at caltech.edu>
wrote:

> Hello,
>
> Thank you for getting back to me.
> I have attached a folder with all the inlist files to this email. The MESA
> version I am using is r22.05.1.
>
> Best,
>
> Natsuko Yamaguchi
> ------------------------------
> *From:* Pablo Marchant <pamarca at gmail.com>
> *Sent:* Wednesday, January 4, 2023 12:25 AM
> *To:* Yamaguchi, Natsuko <nyamaguc at caltech.edu>
> *Cc:* mesa-users <mesa-users at lists.mesastar.org>
> *Subject:* Re: [Mesa-users] A question about rotational mixing for binary
> models
>
> Dear Yamaguchi,
>
> Can you please share your full inlists (as attachments) as well as mention
> your MESA version?
>
> El mié, 4 ene 2023 3:09 a. m., Yamaguchi, Natsuko via Mesa-users <
> mesa-users at lists.mesastar.org> escribió:
>
> Hello,
>
>
> I am a graduate student trying to test the effect of rotational mixing on
> some binary models and am having some difficulty.
>
> I have only recently started using MESA and any assistance on this would
> be greatly appreciated.
>
>
> *Problem:* Including rotational mixing makes no difference to the output
> so I believe it may not be turning on at all.
>
>
> *A few options I have set in inlist_project:*
>
>    - evolve_both_stars = .false.
>    - m1 = 1.5d0
>    - m2 = 0.7d0
>    - initial_period_in_days = 0.75d0 (I have also tried this with m1 =
>    1.0, initial_period = 3.1)
>
> *A few options in inlist_1, including those of rotational mixing:*
>
>    - set_uniform_initial_composition = .true. + initial_h1, initial_h2
>    etc. (I include this here because when I tried including mixing without
>    this once, it did turn on - though there were still issues such as the
>    value of the am_D_mix_factor not having any effect)
>    - am_D_mix_factor = 1/30d0
>    - D_ES_factor = 1 (I have also tried this with am_D_mix_factor = 1,
>    D_ST_factor = 1 instead of D_ES_factor, etc.)
>
> Am I missing anything in the settings for rotational mixing? If additional
> information is helpful, please let me know.
>
>
> Thank you very much in advance,
>
>
> Best,
>
> Yamaguchi
>
> _______________________________________________
> 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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