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Add P-U with M&M Switch

Merged Josh Borrow requested to merge add-morris-and-monaghan into master

This is the version of Pressure-Energy SPH that includes the Morris & Monaghan (1997) variable artificial viscosity with a Balsara switch.

This should not contain too many changes in the central code. The hydro test suite is currently running but we see marginally improved convergence, see below for the 3D Gresho Vortex.

With variable AV: pressure-energy-monaghan_GreshoVortex_3D_11_3D Without: pressure-energy_GreshoVortex_3D_11_3D

Morris, J. P., & Monaghan, J. J. (1997). A Switch to Reduce SPH Viscosity. Journal of Computational Physics, 136(1), 41–50. http://doi.org/10.1006/jcph.1997.5690

Edited by Matthieu Schaller

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