[Mesa-users] Binary evolution problem

[Margaret Streamer]

Hi all,
I have recently upgraded from mesa -r8845 to mesa -r11701.

I have successfully installed the new version on a Linux system and can compile and start my code running OK.  However, running some inlists and inlist-project that worked successfully using
-r8845 now fail on -r11087.

I am modelling Algol-type binaries with conservative mass transfer.

With -r8845, I had investigated the effect of changing mixing length  alpha and found that for m1, m2 values of 2 and 1.8, respectively, were the most optimal.  With -r11701, these values give code terminations as described below.  If I change mixing length alpha values for  m1, m2 to 1.6, 1.5,resp, then I am able to get some models to run as expected.

Also I am now finding that small changes (0.05) in initial masses of the two stars or small changes in initial orbital period (0.1 or less) result in termination of the code with either:

“termination code: Terminate because accretor (r-rl)/rl > accretor_overflow_terminate” or “terminated evolution: cannot find acceptable model; termination code: min_timestep_limit”.

This was not happening with -r8845 where  I could investigate a wide range of initial conditions.

I attach a sample inlists etc that worked for one condition.

I had assumed backwards compatibility between the two MESA releases but maybe I’m missing something?

Regards,
Margaret


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