[mesa-users] Debugging WD cooling in MESA

[Jared Brooks]

Hey Hector,

I've found similar problems in cooling WDs before, and I know you said you
didn't want to raise the tau_factor too much, but raising it to 1d4 was the
only solution that worked for me.

You may also want to try this with the latest mesa release, if you haven't
already, as the Type 1/2 opacity blending has been improved. I haven't
tried it, myself, but its worth a shot.

-Jared

On Wed, Feb 24, 2016 at 10:57 AM, Héctor MR <hector.mr at pitt.edu> wrote:

>   Dear all,
>
>   I have been following Bill Wolf's excellent guide for debugging in MESA (
> http://wmwolf.github.io/projects/mesa_debugging/) in what concerns to
> cooling WDs because I am encountering convergence problems. When I try to
> cool the star, in this case for a maximum age of 1 Gyr, my computations
> stop around ~0.327 Gyr due to some problems in the envelope. The luminosity
> suddenly wiggles and goes down, whilst gradT_sub_grada and mixing_type
> lurch as well. I suspect it is related to
>
>           okay_to_reduce_gradT_excess = .true.
>
>           ! these are for calculation of efficiency boosted gradT
>           gradT_excess_f1 = 1d-4
>           gradT_excess_f2 = 1d-2
>           gradT_excess_age_fraction = 0.9d0
>
>           ! turn on full all the time
>           gradT_excess_lambda1 = 1.0
>           gradT_excess_beta1 = 0.5
>           gradT_excess_lambda2 = 1.0
>           gradT_excess_beta2 = 0.5
>           gradT_excess_dlambda = 1
>           gradT_excess_dbeta = 1
>
>
>   But I have been unable to solve it (turning Ledoux off seems not to help
> either). Does anyone know what is going on? I just do not want to feel
> compelled to cut the models via set_initial_tau_factor. I am attaching the
> inlist, the nuclear net, the initial model and some plots.
>
>   Thanks in advance!
>
>
>   --
>   Héctor
>
>
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