[Mesa-users] YNT: Weird turn points on near TAMS

[Gökhan Yücel]

So, that's normal behaviour. I thought I was doing something wrong.

Thanks for help.

Regards,
Gökhan

________________________________________
Kimden: Francis Timmes [fxt44 at mac.com]
Gönderildi: 07 Ağustos 2021 Cumartesi 22:57
Kime: Gökhan Yücel
Bilgi: Frank Timmes; mesa-users
Konu: Re: [Mesa-users] Weird turn points on near TAMS

with sufficient mass and time resolution a regular pattern emerges,
not necessarily a linear pattern. my plot and inlist attached.

i'm done here. have fun!

fxt





> On Aug 7, 2021, at 8:39 AM, Gökhan Yücel <gokhanyucel at akdeniz.edu.tr> wrote:
>
> Hi
>
> "if you refer to the swing toward the blue"
> it's exactly what I mean with weird turn-off. Of course, I expect them to turn towards blue but as you can see from previous attachments, the problem is the location of that swing/turn is not linear with increasing mass. Is that normal?
>
> I kind of fixed that issue generally by using "set_surface_velocity_v" command instead of using "new_omega_div_omega_crit". But there are still some kind of hiccups there with some masses.
>
> Gökhan
>
>
> ________________________________________
> Kimden: Francis Timmes [fxt44 at mac.com]
> Gönderildi: 06 Ağustos 2021 Cuma 22:03
> Kime: Gökhan Yücel
> Bilgi: Frank Timmes; mesa-users
> Konu: Re: [Mesa-users] Weird turn points on near TAMS
>
> i'm not completely clear what you expect the turn-off to be.
> if you refer to the swing toward the blue, then this is largely
> controlled by the treatment of convective boundaries. attached is
> an hr diagram using your use_ledoux_criterion = .false. default, and
> use_ledoux_criterion = .true. for the 1.22 msun case.
>
> fxt
>
>
>
>
>> On Aug 2, 2021, at 7:32 AM, Gökhan Yücel <gokhanyucel at akdeniz.edu.tr> wrote:
>>
>> Hello Francis,
>>
>> Thanks for suggestion. In my first inlist, maximum time step was set as 10^7 years. I thought it was enough for details.
>>
>> Anyhow, I have followed your suggestion as,
>>
>> 1. Make a single evolution until the Hcenter to drop 0.2 with timestep 10^7 years(for saving time), and when it is reached to 0.2 Hrich, save the model.
>>
>> 2. Start the evolution with saved model with timestep 10^5 years, which is roughly delta-lg-xh-cntr-limit=1d-4, and stop it on an arbitrary phase in the evolution.
>>
>> I have done this with mass range between 1.21 and 1.27 Msun. Unfortunately, as you can see from attached eps file, the result hasn't changed which indicates that the resolution wasn't the problem. There is a still weird, at least not expected, turn-off position on HR diagram.
>>
>> I'm open to any help. I'm using r-12115.
>>
>> Regards,
>> Gökhan.
>> ________________________________________
>> Kimden: Francis Timmes [fxt44 at mac.com]
>> Gönderildi: 30 Temmuz 2021 Cuma 18:31
>> Kime: Gökhan Yücel
>> Bilgi: Frank Timmes; mesa-users
>> Konu: Re: [Mesa-users] Weird turn points on near TAMS
>>
>> hi gökhan,
>>
>> the inlist suggests the runs are relying on the default mass & timestep resolution settings.
>> you may want to consider using smaller timesteps using physically based controls
>> and/or finer mass resolution - especially as a fuel depletes in the core.
>>
>> examples include
>>
>> https://docs.mesastar.org/en/latest/reference/controls.html#timestep-controls
>> https://docs.mesastar.org/en/latest/reference/controls.html#delta-lgt-cntr-limit
>> https://docs.mesastar.org/en/latest/reference/controls.html#delta-lgrho-cntr-limit
>> https://docs.mesastar.org/en/latest/reference/controls.html#delta-lg-xh-cntr-limit
>> https://docs.mesastar.org/en/latest/reference/controls.html#max-dq
>>
>> fxt
>>
>>
>>
>>
>>
>>> On Jul 29, 2021, at 5:29 AM, Gökhan Yücel <gokhanyucel at akdeniz.edu.tr> wrote:
>>>
>>> Sorry, forgot to add. I'm using MESA version of 12115
>>>
>>> ________________________________________
>>> Kimden: Gökhan Yücel
>>> Gönderildi: 29 Temmuz 2021 Perşembe 15:26
>>> Kime: mesa-users at lists.mesastar.org
>>> Konu: Weird turn points on near TAMS
>>>
>>> Hello everyone,
>>>
>>> I have encountered a weird point while doing evolution of a single, rotating stars with different masses between 1.20 and 1.26 M. As you can see from the attachment, the turn off points of near TAMS do not behave as expected. There is a quite differences. Is there a some stellar interior mechanic that affects to make it behave like this in this mass range that I don't know about it, or am I doing something wrong?
>>>
>>> There is nothing extra settings in "run_star_extras.f" file.
>>>
>>> Thanks in advance,
>>> Gökhan
>>> <sample.eps><inlist_project>_______________________________________________
>>> mesa-users at lists.mesastar.org
>>> https://lists.mesastar.org/mailman/listinfo/mesa-users