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

[Manos C. <ma...@fl...>]

Hi Bill,

  Fair enough, attached is a saved model before major convergence issues 
start. At this point the time-step is still fair, but it starts
to slowly drop and I start to see this off-center burning you mentioned.

Manos
> 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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