[FLASH-USERS] How to add new output variables

[Mattia Cipriani]

Dear Eddie,

thank you very much, I will follow your advices.
Are the built-in output variables documented somewhere in the manuals?
It would be good to have a list for future reference.

All the best,
Mattia

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Il giorno 2 apr 2025, alle ore 15:42, Hansen, Eddie <ehansen at pas.rochester.edu> ha scritto:

Hi Mattia,

FLASH has the variables ‘ye’ and ‘sumy’ which you could use to get average ionization state zbar = ye/sumy. Just add ‘ye’ and ‘sumy’ to your list of plot_var’s in your par file if you want these in the plt files.

In general, you can add your own variable by adding a line like this in your simulation’s Config file:
VARIABLE ZBAR

Then, somewhere in the code (usually Simulation_adjustEvolution), you would define what gets saved to ZBAR_VAR. This is typically done within a set of do loops, and then:
solnData(ZBAR_VAR, I, j, k) = some_value

--
Eddie Hansen
Applications Group Leader
Flash Center for Computational Science


From: flash-users <flash-users-bounces at flash.rochester.edu> on behalf of Mattia Cipriani <mattia.cipriani at enea.it>
Date: Tuesday, April 1, 2025 at 4:58 PM
To: flash-users at flash.rochester.edu <flash-users at flash.rochester.edu>
Subject: [FLASH-USERS] How to add new output variables
Dear all,

I would like to add a new variable for the output of my simulations, similar to “dens”, “pres”, “tele” etc.
How can I tell FLASH to output another variable, for example the ionization state at each point of the numerical grid?
I looked at the manual and on the website, but I could not find any answer to this, but I may have missed it.

Thank you for your help.

Best regards,
Mattia



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