[Mesa-users] Questions about MLT++ and center variables

[Matheus Bernini]

Thanks for the help!

Em seg, 27 de ago de 2018 às 12:49, Francis Timmes <fxt44 at mac.com> escreveu:

> hi matheus,
>
>
> > On Aug 27, 2018, at 8:03 AM, Matheus Bernini via Mesa-users <
> mesa-users at lists.mesastar.org> wrote:
> >
> > Hello MESA users,
> >
> > I'm an undergraduate student and I'm using MESA to study the evoltion of
> massive stars up to the oxigen burning.
> >
> > 1) On MESA's second paper (section 7.3.1) it's shown different results
> depending if one choose MLT or MESA's MLT++. Which result should I prefer
> as 'the most correct'?
>
> mlt and mlt++ are 1d approximations to 3d turbulence.
> in this sense they are both wrong. in most regimes within
> a star the two will yield the same result, nearer the
> surface mlt++ allows a more efficient transport of energy.
> which is more "correct", if any, is up to a user to decide.
>
> > 2) How can I switch between MLT and MLT++ on my MESA models?
>
>
>
> http://mesa.sourceforge.net/controls_defaults.html#okay_to_reduce_gradT_excess
> okay_to_reduce_gradT_excess = .true. activates "mlt++".
>
>
> >
> > 3) How the center variables (T_c, rho_c,etc) are defined, in the most
> central cell or  as a region composed by a given amount of cells near the
> center?
>
> http://mesa.sourceforge.net/controls_defaults.html#center_avg_value_dq
>
>
> fxt
>
>
> >
> > Cheers
> >
> > ------------------------------------------------------
> > Matheus Bernini Peron
> > Undergraduate student
> > Observatório do Valongo,
> > Federal University of Rio de Janeiro
> > ------------------------------------------------------
> > _______________________________________________
> > mesa-users at lists.mesastar.org
> > https://lists.mesastar.org/mailman/listinfo/mesa-users
> >
>
>
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