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Sphenix pressure floor

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Merged Loic Hausammann requested to merge sphenix_pressure_floor into master Jan 20, 2020
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In this merge request, I am implementing the pressure floor for SPHENIX. As it is a density scheme, the solution is straight forward and simply requires to use the pressure with the floor in both the momentum and internal equations.

This was tested with the new example PressureFloor. It is simply the cooling box with self gravity. The setup is done in order to collapse quickly (about 1min of simulation) without pressure floor. With the SPHENIX pressure floor, I am able to avoid this collapse.

@jborrow, I am touching a bit SPHENIX, therefore I guess that you may want to take a quick look.

Edited Jan 21, 2020 by Loic Hausammann
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Source branch: sphenix_pressure_floor