[FLASH-USERS] Gravity in StirFromFile Turbulence Simulation

[Hansen, Eddie]

Many units in FLASH get initialized but aren't necessarily being used.  In your object directory, you can check the file “setup_units” to see a list of units that the setup script has prepared for compiling. If you see a line that says “physics/Gravity” but no other lines with deeper directory names inside Gravity/ then the code is not actually using Gravity.

If the code was potentially using Gravity, you’d see a line like “physics/Gravity/GravityMain/Poisson” in the “setup_units” file. But if it just has “physics/Gravity”, that means the code is only compiling what we call the “stub implementation” of the Gravity unit. If you look at many of the Gravity_*.F90 files, you’ll see that they don’t actually do anything.

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Eddie Hansen | Research Scientist
Flash Center for Computational Science
Dept. of Physics and Astronomy
University of Rochester, Rochester, NY
Cell 607-341-6126 | flash.rochester.edu
(he / him / his)
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From: flash-users <flash-users-bounces at flash.rochester.edu> on behalf of Alex Anorve <manzana.granada at gmail.com>
Sent: Wednesday, June 28, 2023 5:41:29 PM
To: flash-users at flash.rochester.edu <flash-users at flash.rochester.edu>
Subject: [FLASH-USERS] Gravity in StirFromFile Turbulence Simulation

Hello:

I am running a StirFromFile simulation. Following the manual I setup the object dir with something similar to


./setup StirFromFile -auto -3d -nxb=16 -nyb=16 -nzb=16 +ug -with-unit=physics/Hydro.

After compiling the object dir everything goes well, however after running the flash4 executable I get the message "Gravity initialized"

I do not want to run the simulation with Gravity enabled, after searching for a while, I found that the message comes from the module Driver, specifically from source/Driver/DriverMain/Driver_initFlash.F90 which calls to Gravity_init()

How can I disable Gravity to run only the simulation with the Hydro module (without gravity)?



Many thanks for your help



Alex Anorve
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