[FLASH-USERS] Radiative Flux in FLASH

[Owen Bardeen]

Just to provide some more context in case it's helpful:

I am using FLASH version 4.7.1, with the LaserSlab module. I have 7 mgd
groups, as outlined in my .par file:
rt_useMGD       = .true.
rt_mgdNumGroups = 7

It seems to me that FLASH must store information about radiation transfer
in each group somewhere. I'm looking
in FLASH4.7.1/source/physics/RadTrans/RadTransMain/MGD but it's not obvious
to me where it's stored. It would be nice if I could just add it as a
variable to flash.par to be included in the output files, but if I have to
dig into the Fortran that's fine too.

If someone could point me in the right direction it would be much
appreciated.

Thank you!
Owen

On Wed, Jul 9, 2025 at 3:30 PM Owen Bardeen <owenbardeen at gmail.com> wrote:

> Hello all,
>
> I’m currently working on a simulation involving radiative transport in a
> hot plasma using the FLASH code (v4.7.1). I’m interested in quantifying the
> radiative emission, with the capability of comparing radiative emission
> from different energy groups (0.1-1 eV, 1-10 eV, etc.).
>
> My question is: what is the best way to determine the total radiative
> output, as well as from one specific energy bin/group, from FLASH output?
>
> I’ve generated the necessary Propaceos opacity tables with a dedicated
> energy group covering just this narrow range.
>
> If anyone has experience extracting radiative output from individual bands
> in FLASH, I’d greatly appreciate your guidance.
>
> Thank you!
>
> Owen Bardeen
>
> University of California, San Diego
>
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