[FLASH-USERS] About (fully ionised) electrons+ions mhd simulations in flash

[Ernesto Zurbriggen]

Hi Marissa.

Thank you very much for your answer!



El lun, 14 feb 2022 a las 13:31, Marissa B. P. Adams (<
madams at pas.rochester.edu>) escribió:

> Hi Ernesto,
>
> The short answer: no.
>
> More explanation: FLASH advances the total momentum equation for the
> system; therefore everything is treated as a single fluid, however that
> fluid is composed of three "species" (in flash terms) as you have pointed
> out via the 3T treatment. There are other codes that follow a comparable
> prescription with two-temperatures, such as GORGON (see the thesis by
> Benjamin Khiar). I would recommend looking at 14.3+ of the user manual (you
> probably have already). Long story short 3T/2T =/= 2-fluid.
>
> Aside: One can then make the approximation that given the ions are 43
> times heavier than the electrons for even the lightest element (Z=1) that
> this is a fine assumption, and one can fold in the electron equation of
> motion into the induction equation that advances the Generalized Ohm's Law.
> I am not stating that this is what single-fluid MHD codes with x-MHD
> capabilities "do," but it is one perspective of viewing the single-fluid
> treatment if albeit physically flawed.
>
> I hope this helps, or at least clarifies/makes some sense :)
>
> Have a nice day!
> Marissa
>
> On Mon, Feb 14, 2022 at 11:20 AM Ernesto Zurbriggen <
> ezurbriggen at unc.edu.ar> wrote:
>
>> Hello everyone.
>>
>> I wonder if it is possible to perform 2-fluids (fully ionised plasma,
>> i.e. electrons+ions) mhd simulations in flash using the unsplit staggered
>> mesh solver.
>>
>> In the user manual I saw flash allows unsplit hydrodynamic +
>> 3-temperatures (electron, ions, radiation), but I'm not sure if this is the
>> same or customisable to a strict 2-fluid MHD scenario.
>>
>> Any information would be appreciated.
>> Best regards!
>> Ernesto.
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>
>
> --
> %---------------------------------------------%
> Marissa B. P. Adams
> (she/her/hers)
> Phd Candidate, University of Rochester
> *E-mail:* madams at pas.rochester.edu
> *Website:* https://www.pas.rochester.edu/~madams
> <http://www.pas.rochester.edu/~madams#>
> *Current Location:*
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> Rochester, NY 14627
>
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