[Mesa-users] Problem with 'prepare_for_new_try: bad num omega error

[Ian Foley]

Hi,

I'm having problems with the following error killing my run

stop 'prepare_for_new_try: bad num omega'.

Checking the source code in evolve.f90 tells me that one or more cells has
an angular momentum (omega(k)) > 1d50. Examining the profile output near
and just before the error shows that omega, i_rot and j_rot has no values
that are near or could cause a value of 1d50.

It has occurred about 10 times while evolving a 12M star in the si28 burning
stage and beyond. inlist has z=0.02, no overshooting, blocker=0.7 for mass
loss and low rotation. Timesteps are varying between logdt -6 to -13. Most
of si28 has burned off-center and fe56 abundance is up around 0.6.

Without supplying any inlists etc but can if needed, my question is what to
do about this error to prevent it occurring. I started the run with only
low rotation. I really don't understand what is causing it. mess_coeff=1.5
and there are added zones around the si28 and fe56 burning regions. At this
stage the error is blockiing further progress.

At this stage I am asking if there is some general advice that can be
given. If there are specifics needed with my actual run, I can supply the
necessary files.

I have attached 4 png files which will help to capture the context.

I am fascinated by the possibility that core collapse may occur off-center.
Can't find anything about that in the literature. It's assumed that the
off-center burning will migrate to the centre, but there's no evidence of
it in this run and similar behavior at the 13M level - also not completed.

Thanks in advance.
ian
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