Cosmological smoothed particle hydrodynamics simulations: the entropy equation
Cosmological smoothed particle hydrodynamics simulations: the entropy equation
We discuss differences in simulation results that arise between the use of either the thermal energy or the entropy as an independent variable in smoothed particle hydrodynamics (SPH). In this context, we derive a new version of SPH that, when appropriate, manifestly conserves both energy and entropy if smoothing lengths …