[Mesa-users] Surface velocity NOT decrease with mass loss

[Rob Farmer]

Hi
It's really unclear what is going on, we need more information before
anyone can help you.

> I looked at the history.data and found that the speed of these models was
increasing all the time and it seemed that the total angular momentum does
not decrease with mass loss. The total angular momentum decreases by orders
of magnitude but I think it's just due to the decline of mass.

The first sentence says that the total angular momentum does not decrease
with mass loss, but then your next sentence says it decreases by orders of
magnitude?Which is it? Are you losing angular momentum or not? Plots would
help here to explain what you think is the problem.

>but when the mass is higher than 44Msun, the model cannot converge when
the O core is formed.

There are many challenges in modelling massive stars especially regarding
the envelope. But there's not enough information here. Again plots, like a
kippenhan, can help, also look at the terminal output to determine what is
limiting your timesteps? We would also need to see all of your inlists to
help diagnose a problem.

Rob


On Thu, 5 Aug 2021 at 08:51, Levi via Mesa-users <
mesa-users at lists.mesastar.org> wrote:

> Hi, all
>
>
>
>  There seems to be something wrong with my mass loss scheme. When the mass
> is lower than 44Msun, the model can end at the core collapse, but when the
> mass is higher than 44Msun, the model cannot converge when the O core is
> formed. I looked at the history.data and found that the speed of these
> models was increasing all the time and it seemed that the total angular
> momentum does not decrease with mass loss. The total angular momentum
> decreases by orders of magnitude but I think it's just due to the decline
> of mass.
>
>
> After that, I tried to replace the mass loss scheme with the "Dutch"
> scheme. The model can converge, the speed decreases rapidly, and the total
> angular momentum decreases by three orders of magnitude.
>
>
> The following are the files that may be required, please see brott_wind
> subroutine.
>
> To add, I set new_surface_rotation_v = 600 and surf_w_div_w_crit_limit =
> 0.98 .
>
>
> With regards,
>
> Levi
>
>
>
> _______________________________________________
> mesa-users at lists.mesastar.org
> https://lists.mesastar.org/mailman/listinfo/mesa-users
>
>
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