[mesa-users] CO cores

[Tuguldur Sukhbold]

I just figured out that when you give a little bit of 'jump start' by increasing the initial timestep it actually works.

when years_for_initial_dt = 0.5, the 5Msun case works just fine, and for the smallest 3Msun case initial timestep of 0.8 works.


Tuguldur






On Jul 22, 2013, at 12:42 AM, Tuguldur Sukhbold <sukhbold at ucolick.org> wrote:

> Dear MESA users,
> 
> I am trying to set up just bare CO core runs with MESA and getting into trouble in certain cases. This is weird because with an older version of the code I was able to do everything without any issues.
> 
> Basically I am trying to simulate CO cores in the mass range of 3-25Msun with varying initial compositions, which is a simple function of initial core mass:
> 12C = −0.035 × ln(MC/O) + 0.253 and 16O = 1−12 C
> 
> Everything worked fine with 3647. Now when I try to do the same exercise with 4930, I am having trouble for masses below roughly 6.5Msun with compositions given by the equations above (Above this mass works fine). Basically it is running into convergence issues while it is relaxing into the assigned composition (relax_initial_to_xaccrete), the timesteps are getting ridiculously small.
> 
> Attached is one sample inlist for 5.0Msun bare CO core.
> 
> I will really appreciate your help!
> 
> thanks,
> Tuguldur
>  
> <inlist>

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