[mesa-users] another mesa question

[Sébastien Deheuvels]

Hi Ehsan,

Thank you for your quick reply! I thought I had added 
>      when_to_stop_rtol = 1d-4
>      when_to_stop_atol = 1d-4
to my inlist as I usually do, but I had not, and this was the reason of the problem, you were right. Thanks.

Cheers,

Sebastien.

Le 17 août 2015 à 18:07, Ehsan Moravveji a écrit :

> Hi Sebastien,
> I “guess” you’re terminating your run based on an upper age. Given the fact that the age difference between your restart model, and your desired final model is around 1.32 Myr, then your should already set a small enough timestep in your inslist to make sure there are enough steps in between the two starting and ending points. Here, “max_timestep” can help you.
> The second is to have a “precise” control over your landing point. I mean, you would like your final model be at 1.81260 Gyr, but how much tolerance do you give it?
> Then, the following two controls are brilliantly designed to tune this:
>      when_to_stop_rtol = 1d99
>      when_to_stop_atol = 1d99
> set them at least to 1d-4 (or even less) and explore if you land on the spot you desire.
> 
> I hope this helped.
> Ehsan.
> 
> 
> 
>> On 17 Aug 2015, at 17:57, Bill Paxton <paxton at kitp.ucsb.edu> wrote:
>> 
>> On Aug 17, 2015, at 5:48 AM, Sébastien Deheuvels wrote:
>> 
>>> I would like to restart a MESA run for a short period of time. My model's age is 1.81128 Gyr, and I would like to evolve it to 1.81260 Gyr. But when I run this, I obtain a model with an age of 1.81294 Gyr. There seems to be a lower bound to the first timestep for a restart and I could not find ways of going around this in the controls options. Do you know how I could solve this? Thanks a lot in advance!
>> 
>> Hi Sebastien,
>> 
>> That's an interesting question.  Let's get mesa-users involved by forwarding it to them to give some other folks a chance to think about it -- perhaps someone has encountered this issue previously.  Meantime you might send a followup email to mesa-users with the saved mode, the inlist, and details of what you tried that failed to work.
>> 
>> Cheers,
>> Bill
>> 
>> 
>> 
>> 
>> 
>> 
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