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<p class="MsoNormal">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.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">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.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">******************************************<o:p></o:p></p>
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<p class="MsoNormal">Eddie Hansen | Research Scientist<o:p></o:p></p>
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<p class="MsoNormal">Flash Center for Computational Science<o:p></o:p></p>
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<p class="MsoNormal">Dept. of Physics and Astronomy<o:p></o:p></p>
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<p class="MsoNormal">University of Rochester, Rochester, NY<o:p></o:p></p>
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<p class="MsoNormal">Cell 607-341-6126 | flash.rochester.edu<o:p></o:p></p>
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<p class="MsoNormal">(he / him / his)<o:p></o:p></p>
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<p class="MsoNormal">******************************************<o:p></o:p></p>
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<p class="MsoNormal"><b><span style="color:black">From:</span></b><span style="color:black"> flash-users <flash-users-bounces@flash.rochester.edu> on behalf of Alex Anorve <manzana.granada@gmail.com><br>
<b>Sent:</b> Wednesday, June 28, 2023 5:41:29 PM<br>
<b>To:</b> flash-users@flash.rochester.edu <flash-users@flash.rochester.edu><br>
<b>Subject:</b> [FLASH-USERS] Gravity in StirFromFile Turbulence Simulation</span>
<o:p></o:p></p>
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<p class="MsoNormal">Hello:<o:p></o:p></p>
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<p class="MsoNormal">I am running a StirFromFile simulation. Following the manual I setup the object dir with something similar to
<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p><tt><span style="font-size:10.0pt">./setup StirFromFile -auto -3d -nxb=16 -nyb=16 -nzb=16 +ug -with-unit=physics/Hydro</span></tt>.
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<p>After compiling the object dir everything goes well, however after running the flash4 executable I get the message "Gravity initialized"</p>
<p>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()</p>
<p>How can I disable Gravity to run only the simulation with the Hydro module (without gravity)?</p>
<p><o:p> </o:p></p>
<p>Many thanks for your help</p>
<p><o:p> </o:p></p>
<p>Alex Anorve</p>
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