[mesa-users] 100 Ms fails to converge

Bill Paxton paxton at kitp.ucsb.edu
Tue May 1 13:08:00 EDT 2012

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,

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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