Re: [mesa-users] Convergence of models in the 11 - 14 Msun range

[Bill P. <pa...@ki...>]

Hi,

Inlist is good.  But please don't force me to start from the pre ms.   Send a saved model from a bit before it starts to get convergence problems.

-B




On Jun 26, 2014, at 1:51 PM, Manos Chatzopoulos wrote:

> Dear Bill et al.,
> 
> Attached is the inlist I am using, with the latest version of MESA (6596) compiled with the latest version of MESASDK
> for MacOSX. Running on 4 threads. Thank you for looking into this, in the meantime I will try to play around with
> the overshooting parameter as you mentioned.
> 
> Manos
>> Hi Manos,
>> 
>> Please send inlists and all details necessary to reproduce a sample case.
>> I'd like to know how far the evolution has gone when convergence fails.
>> In the past, this mass range has ignited Ne20 off-center after C/O burning.
>> It then takes a very large number of timesteps for the burning front to advance inward to the center.
>> The advanced is limited by not being able to deplete the Ne20 over a significant mass range at once.
>> With convection that works to help the burning go relatively quickly.
>> For inward burning, there is no help from mixing --- unless you crank up overshooting below the burn.
>> Without the help of overshooting to drive things inward faster, it has to creep inward bit by bit.
>> 
>> -Bill
>> 
>> 
>> 
>> 
>> 
>> 
>> On Jun 26, 2014, at 1:38 PM, Manos Chatzopoulos wrote:
>> 
>>> Dear all,
>>> 
>>>  Has anyone managed to have a converged MESA model all the way from
>>> pre-MS to pre-supernova (core-collapse)
>>> in this rather interesting mass range of 11 - 14 Msun? Stars around this
>>> mass range are thought to make electron-capture
>>> SN progenitors with O/Ne/Mg cores, but when I try running them they
>>> always seem to fail to converge past
>>> core C/O burning. Is this relevant to the core becoming significantly
>>> degenerate? Any insight on this would be
>>> appreciated.
>>> 
>>> Best,
>>> 
>>> Manos
>>> 
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> 
> <inlist_input.txt>