[mesa-users] new parameter on make_o_ne_wd test suite

Bill Paxton paxton at kitp.ucsb.edu
Fri Aug 26 14:03:41 EDT 2016

A bit of motivation for the new D_omega scheme:  the idea is that the rotational instabilities such as ES, ST, GSF, etc. are now treated as source terms for the actual rotational mixing coefficient D_omega.  But D_omega isn't simply a sum of the sources -- it has a life of it's own in that it decays gradually in time and spreads gradually in space.  This buffers it against the step-to-step large changes that can (and do) happen in the sources as a result of the code taking finite size steps during which the micro-profile of rotational stress can change dramatically.  My hope is that the behavior of D_omega will be both more physical and more effective computationally.  I'm of course looking forward to user comments and suggestions.


On Aug 26, 2016, at 10:30 AM, Gabriel Lauffer Ramos wrote:

> Dear mesa-users,
> I'm using the test suite make_o_ne_wd and realized that there are two new parameters added on the last mesa release (r-8845):
> change_D_omega_flag = .true.
> new_D_omega_flag = .true.
> the addition of them make a substantial difference on the HR diagram.
> On the star_job.defaults documentation it is shown the default values are .false. but there are none explanation about the purpose of those parameters. 
> Could someone help me or point the direction to understand those parameters?
> Kind regards,
> Gabriel Lauffer Ramos
> ============================================
> Lattes / CV
> M.A. in Physics:
> Federal University of Rio Grande do Sul - UFRGS, RS, Brazil
> Concentration: Astrophysics. Expected Graduation: 2018
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