[FLASH-USERS] interaction of 2 flows with different species

[acreyes acreyes]

Hi Antoine,

You can accomplish this with the MultiSpecies unit combined with the
MultiGamma EOS implementation. The easiest way would be to add the
following to your setup line "species=spc1,spc2
--with-unit=physics/Eos/EosMain/Multigamma",
where spc1 & spc2 can be any 4 character name you want.  You can then
specify the gamma for each species with the runtime parameters
"ms_spc1Gamma" & "ms_spc2Gamma". You'll also need to set the
appropriate mass fractions for each species in your initial conditions.
Take a look at the following section in the user guide
<http://flash.uchicago.edu/site/flashcode/user_support/flash4_ug_4p62/node89.html>
for
some of the other runtime parameters generated by the setup for the
MultiSpecies.

Adam

On Tue, Jan 19, 2021 at 8:31 AM Antoine Gintrand <antoine.gintrand at gmail.com>
wrote:

> Dear flash users,
>
> I would like to ask if anyone knows what could be
> the best and easiest approach to extend my simulation of the interaction
> between 2 planar flows of an ideal gas with adiabatic index gamma=5/3
>
> to the simulation of the interaction between one species with gamma=5/3
> from the left
> and a second species gamma=1.2 from the right.
>
> Thank you very much for any suggestions,
>
> Best,
>
> Antoine.
>
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