[mesa-users] Possible numerical instability

Aaron Dotter aaron.dotter at gmail.com
Sun Feb 27 07:30:23 EST 2011

Hi Matwey,

You're likely running into a real challenge with stellar physics, rather
than MESA.  However, it's impossible to help you diagnose your problem
without more information.

Please try the following: save a model near where the problem occurs but
sufficiently far away that the model hasn't already arrived at logdt=-1.
 Verify that this model eventually dies at the same place as the run that
starts at the pre-MS.  Then, you can send us the saved model, your inlist,
and the last few lines from the terminal output.  This will make it possible
for us to understand what you're experiencing and then we may be able to
help you.

Best wishes,

On Sun, Feb 27, 2011 at 2:35 AM, Matwey V. Kornilov <
matwey.kornilov at gmail.com> wrote:

> Hi,
> I am trying to tune `1M_pre_ms_to_wd` test (which works excellently)
> for star whose mass is 2M. I faced with strange behavior after H-He
> pulses at AGB. logdt dropped down to -1.0 and less. The track on
> logL-logT looks to be numerically noisy (at least for me, so tell me
> if I'm wrong).
> My version is r2987. I need help to overcome this thing.
> Thanks in advance.
> --
> With best regards,
> Matwey V. Kornilov
> http://0x2207.blogspot.com
> xmpp:0x2207 at jabber.ru
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