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

[Rob Farmer]

Hi

1) MLT++ takes mlt and adds extra terms that can be thought of as extra
un-modelled energy transport mechanisms. MLT++ might improve the numerical
stability of your model but it will give you a different answer compared to
using MLT, which is correct is for you to decide.

2) okay_to_reduce_gradT_excess = .true.  will turn mlt++ on, there is then
a few other options to tweak it (see star/inlist_massive_defaults and look
for the gradT_excess terms as a starting point)

3) By fraction of the star, set by the control center_avg_value_dq
(defaults to 1d-8)

Rob


On Mon, 27 Aug 2018 at 17:03, 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'?
>
> 2) How can I switch between MLT and MLT++ on my MESA models?
>
> 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?
>
> 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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