[Mesa-users] Heavy rotation in massive stars

[Francis Timmes]

hi amar,

i suspect the issue is the same as in the recently posted

https://lists.mesastar.org/pipermail/mesa-users/2022-August/013973.html

that is, insufficient timestep resolution to observe the initial imposed rotation profile evolve.

fxt

 


> On Aug 18, 2022, at 2:34 AM, Amar Aryan via Mesa-users <mesa-users at lists.mesastar.org> wrote:
> 
> Dear mesa user,
> 
> MESA_VERSION : mesa-r22.05.1
> OS : Ubuntu 20.04
> 
> I am trying to evolve a heavily rotating 25 M_sun ZAMS star up to the stage of core-collapse by setting new_omega_div_omega_crit = 1.0 in inlist_mass_Z_wind_rotation. The model could successfully evolve up to the desired stage. Just to check if the rotation has been implemented correctly or not, I plotted "surf_avg_omega_div_omega_crit" against "star_age" when the run has finished inlist_to_zams.  From the attached plot, I could see that the "surf_avg_omega_div_omega_crit'' has almost never touched the value of 1.0! 
> <rotation.png>
> 
> So, I am just wondering if the rotation has been correctly employed in the model or not. Also, Is it because the "surf_avg_omega_div_omega_crit"  represent the average value of "omega_div_omega_crit" at the surface? I am using satisfactory temporal and spatial resolution by setting :  time_delta_coeff = 0.8, varcontrol_target   = 1d-3, mesh_delta_coeff = 0.7, and mesh_delta_coeff_for_highT = 0.9.
> 
> Please provide your suggestion.
> 
> With regards,
> Amar
> 
> 
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