[FLASH-USERS] short range particle forces

[Pooja Rao]

Hi Jon and others,

I am relatively new to Flash and trying to set up a multiphase gas-particle
flow, where I need to simulate the drag and lift forces on the particles.
If you come across something useful, it would be great if you can share it
here. Thanks!

Pooja

On Tue, Apr 24, 2018 at 3:43 PM, John ZuHone <jzuhone at gmail.com> wrote:

> Hi Jon,
>
> I tried recently to implement a short-range force (self-interacting dark
> matter) but the climb was pretty steep in terms of implementation and I
> ended up switching to another code which had this particular feature
> already, for no other reason than it was quicker for me. The main
> difficulty was handling interactions between particles on different
> processors without allocating huge metadata arrays.
>
> If you’re adding drag to particles based on interpolation from grid
> variables, this should be far easier. You can use the same
> Grid_mapMeshToParticles functionality which is used for gravity.
>
> I think that the reason for the “ParticleMesh” subdirectory is mostly
> historical—originally it was thought that we might have ways of applying
> gravitational acceleration to particles which didn’t require the mesh.
>
> John
>
> =====================================
> John ZuHone, Chandra/ACIS Operations
> Harvard-Smithsonian Center for Astrophysics
>
> 60 Garden St., MS-67 (w) 617-496-1816
> Cambridge, MA 02138 (m) 781-708-5004
>
> john.zuhone at cfa.harvard.edu
> http://hea-www.cfa.harvard.edu/~jzuhone
> =====================================
>
> On Apr 24, 2018, at 4:27 PM, Slavin, Jonathan <jslavin at cfa.harvard.edu>
> wrote:
>
> Hi all,
>
> I'm looking to add a short range particle forces (drag) to Flash and
> wondered if anyone had done that yet (successfully). If so, any advice
> would be appreciated. Also, I'm wondering why the gravity force needs a
> subdirectory ParticleMesh under source/Particles/
> ParticlesForces/longRange/gravity
>
> Regards,
> ​Jon​
>
> --
> ________________________________________________________
> Jonathan D. Slavin                 Harvard-Smithsonian CfA
> jslavin at cfa.harvard.edu       60 Garden St
> <https://maps.google.com/?q=60+Garden+St&entry=gmail&source=g>reet, MS 83
> phone: (617) 496-7981       Cambridge, MA 02138-1516
> cell: (781) 363-0035             USA
> ________________________________________________________
>
>
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