[mesa-users] 100 Ms fails to converge

[Craig Stephen Lage]

Bill,

Thanks for the suggestions.  As you suggested, the problem goes away for
very small Z.  I understand that for these very massive stars the stability
is marginal and it is difficult to get convergence.  I'll try some of the
other ideas you mentioned. I can get most of what I need by restricting
M<50.

Thanks,
Craig

On Tue, May 1, 2012 at 1:08 PM, Bill Paxton <paxton at kitp.ucsb.edu> wrote:

> Hi Craig,
>
> You've hit on an interesting topic!
> Try with a very low Z and then gradually increase to see what happens.
> Make plots of Pgas/Ptotal to look for places where this is < 0.1 ---
> compare to location of opacitiy "bumps" from Fe.
> Try turning on super eddington wind (e.g., set super_eddington_wind_eta =
> 1)
> Try a tiny amount of rotation -- 1 km/sec say (wait until ZAMS to turn it
> on)
>
> You might also want to take a look at massive_prems_to_late in the
> test_suite for the new version.
> There are some other tricks in there.
>
> Good luck,
> Bill
>
>
>
>
>
>
> On May 1, 2012, at 9:56 AM, Craig Stephen Lage wrote:
>
> > All,
> >
> > I am beginning to run mesa-star on massive stars.  Up to 50 solar
> masses, everything seems fine.  When I try to run a 100 solar mass star, it
> fails to converge toward the end of H burning and never makes the
> transition to He burning.  I've tried a number of combination of finer
> grids, relaxed convergence criteria, etc, but haven't found a combination
> that works.  Any words of wisdom from more experienced users?
> >
> > Thanks,
> > Craig Lage - NYU
> >
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