[FLASH-USERS] 回复： Hybird-PIC in FLASH

[Daan van Vugt]

Dear Mats, Joe,

The complexity depends on what kind of coupling terms you want to take into
account. Energy and density source/sink terms are easiest (I did those in
JOREK), and there are also ways to write a pressure coupling.
You can see
https://pubs.aip.org/aip/pfb/article-abstract/4/7/2033/940129/Three-dimensional-hybrid-gyrokinetic
for the pressure coupling scheme.
This has been applied in JOREK at
https://pure.tue.nl/ws/portalfiles/portal/242595133/5.0119435.pdf (see
chapter 4 of
https://pure.tue.nl/ws/files/174874567/20210705_Dvornova_0207.pdf for more
detail).
Of course this has been written for a very specific formulation of the MHD
equations, but I hope the ideas therein may help you.

All the best,
Daan

On Thu, 24 Apr 2025 at 09:54, 王美乔 <2521795240 at qq.com> wrote:

> Dear Dr. Holmstrom,
>
> Thank you so much for your kind reply — I’m really glad to hear from you!
>
> As you mentioned, coupling fluid and Hybrid-PIC in a self-consistent way
> is indeed quite challenging. We’ve found that handling the collision
> effects between particles and the background fluid, as well as advancing
> the electromagnetic fields properly, are among the most difficult aspects.
> We’re currently exploring possible approaches to address these issues, and
> we look forward to further discussions and exchanges with you.
>
> Thanks again for developing the Hybrid-PIC solver in FLASH！！
>
> Best regards,
> Joe
> University of Chinese Academy of Sciences (UCAS)
>
> ------------------------------
> 王美乔
> 2521795240 at qq.com
>
> <https://wx.mail.qq.com/home/index?t=readmail_businesscard_midpage&nocheck=true&name=%E7%8E%8B%E7%BE%8E%E4%B9%94&icon=http%3A%2F%2Fthirdqq.qlogo.cn%2Fg%3Fb%3Dsdk%26k%3DibcvtYgppl5lYjlauGM0CmQ%26s%3D100%26t%3D1648049135%3Frand%3D1648443710&mail=2521795240%40qq.com&code=>
>
>
>
> ------------------ 原始邮件 ------------------
> *发件人:* "Mats Holmstrom" <matsh at irf.se>;
> *发送时间:* 2025年4月24日(星期四) 下午2:35
> *收件人:* "flash-users"<flash-users at flash.rochester.edu>;
> *主题:* Re: [FLASH-USERS] Hybird-PIC in FLASH
>
>
> Hello Joe,
>    I wrote the hybrid PIC solver in FLASH.
>
> I am not aware of any works that couples fluid and particles, in FLASH,
> or any other MHD solver.
>
> What usually is done is to take the MHD E and B fields and simulate test
> particles, but that does not give any coupling between fluid and particles.
>
> An interesting idea, but not trivial to derive the math, algorithm and
> then implement it
>
> Regards,
> Mats Holmstrom
> Swedish Institute of Space Physics
>
>
> On 2025-04-23 18:31, 王美乔 wrote:
> > Dear FLASH Team,
> >
> > I hope this message finds you well.
> >
> > I am currently using FLASH for some Hybrid-PIC research. I have noticed
> > that modeling all plasma components as particles is extremely
> > computationally expensive. To address this, I am attempting to treat
> > most of the low-energy plasma as a fluid, while representing the
> > high-energy portion as particles.
> >
> > However, I have encountered several difficulties with this approach. I
> > would like to ask whether anyone on the team has experience with such a
> > setup. Specifically, is it possible to simulate both fluid and
> > Hybrid-PIC particles simultaneously in FLASH and allow them to interact
> > with or drive each other? If so, are there recommended methods, modules,
> > or example cases you could share?
> >
> > Thank you very much for your help and advice!
> >
> >
> > Best regards,
> > Joe
> > University of Chinese Academy of Sciences
> >
> >
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> > flash-users at flash.rochester.edu
> >
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-- 
dr. ir. Daan van Vugt
Ignition Computing | CEO

T: +31 (0) 6 5202 8891
E: dvanvugt at ignitioncomputing.com
W: ignitioncomputing.com <http://www.ignitioncomputing.com>
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