[Mesa-users] ppisn: neutrino luminosity as a threshold for turning on Riemann solver

[Vahid Borji]

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On Sat, 8 May 2021, 07:18 Jing-Ze Ma via Mesa-users, <
mesa-users at lists.mesastar.org> wrote:

> Hi Francis and Pablo,
>
> Thank you for your comments! So far I've tried a 60 solar mass and a 90
> solar mass model with x_ctrl(3) = 12.5d0, and their final fates show no
> significant difference than the runs with x_ctrl(3) = 9d0. But I'll try
> more runs to see if it works for all masses.
>
> Cheers,
> Jing-Ze
>
>
> -----Original Messages-----
> *From:*"Pablo Marchant" <pamarca at gmail.com>
> *Sent Time:*2021-05-07 01:13:15 (Friday)
> *To:* "Francis Timmes" <fxt44 at mac.com>
> *Cc:* "Jing-Ze Ma" <mjz18 at mails.tsinghua.edu.cn>, mesa-users <
> mesa-users at lists.mesastar.org>
> *Subject:* Re: [Mesa-users] ppisn: neutrino luminosity as a threshold for
> turning on Riemann solver
>
> And just as a quick comment, many of those options that regulate the
> turning on/off of hydro in the ppisn test case have evolved to attempt to
> make the test as reliable as possible. In my experience at least, shifting
> the threshold for neutrino luminosity too high can cause problems in pulses
> after the first one, where the star can be very bloated owing to the energy
> injection in the first pulse. Without hydro, the envelope of the model can
> struggle and drive timesteps down.
>
> Still, would be pretty interesting for someone to study more in detail how
> much these numerical options affect the outcome. I did a few tests and did
> not find significant differences, other than a varying reliability of the
> models. But still, I never studied it systematically.
>
> Cheers
>
> On Thu, May 6, 2021 at 6:58 PM Francis Timmes via Mesa-users <
> mesa-users at lists.mesastar.org> wrote:
>
>> dear jing-ze,
>>
>> this is an excellent experiment for you to run!
>> then you'll be able to quantify the differences.
>>
>> fxt
>>
>>
>>
>>
>>
>> > On May 5, 2021, at 10:38 PM, Jing-Ze Ma via Mesa-users <
>> mesa-users at lists.mesastar.org> wrote:
>> >
>> > Hi everyone,
>> >
>> > I've been experimenting with the ppisn test_suite. I noticed that the
>> Riemann solver will be turned on when neutrino luminosity reaches a certain
>> value before dynamical instability. In Merchant 2019 paper it's set to be
>> 10d0 (10^10 solar luminosity), whereas in the test_suite it's 9d0. If I
>> want to delay the turning on of Riemann solver and set this value to be
>> 12d0, will the results be much different (e.g., give very different BH
>> masses or make a PPISN event become a direct iron core collapse)?
>> >
>> > Thank you in advance.
>> >
>> > Cheers,
>> > Jing-Ze
>> >
>> >
>> > --
>> > Jing-Ze Ma
>> > Undergraduate Student,
>> > Tsinghua University
>> >
>> > _______________________________________________
>> > mesa-users at lists.mesastar.org
>> > https://lists.mesastar.org/mailman/listinfo/mesa-users
>> >
>>
>> _______________________________________________
>> mesa-users at lists.mesastar.org
>> https://lists.mesastar.org/mailman/listinfo/mesa-users
>>
>>
>
> --
> Pablo Marchant Campos
> M.Sc on Astrophysics, Universidad Católica de Chile
> PhD on Astrophysics, Argelander-Institut für Astronomie, Universität Bonn
>
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