Constant entropy sampling and release waves of shock compressions

Jean-Bernard Maillet (1) , Emeric Bourasseau (1) , Laurent Soulard (1) , Jean Clerouin (1) , Gabriel Stoltz (2)

1 DAM/DIF - DAM Île-de-France
2 CERMICS - Centre d'Enseignement et de Recherche en Mathématiques et Calcul Scientifique

We present several equilibrium methods that allow to compute isentropic processes, either during the compression or the release of the material. These methods are applied to compute the isentropic release of a shocked monoatomic liquid at high pressure and temperature. Moreover, equilibrium results of isentropic release are compared to the direct nonequilibrium simulation of the same process. We show that due to the viscosity of the liquid but also to nonequilibrium effects, the release of the system is not strictly isentropic.

Domaines: Mécanique statistique [cond-mat.stat-mech]

Jean-Bernard Maillet, Emeric Bourasseau, Laurent Soulard, Jean Clerouin, Gabriel Stoltz. Constant entropy sampling and release waves of shock compressions. Physical Review E : Statistical, Nonlinear, and Soft Matter Physics, 2009, 80, pp.021135. ⟨hal-00360631v2⟩