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A nonisothermal thermodynamic model of liquid-vapor interaction with metastability

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François James (Orléans)

We propose the construction of a liquid-vapor relaxation model which is
able to capture metastable as well as saturation states of the nonisothermal van der Waals model.
The Gibbs formalism is recast as a constrained optimization problem, from which we recover
physical laws, such as the Gibbs phase rule. From these results we deduce a dynamical system whose
long time equilibria are the physically stable states. This behaviour is illustrated by numerical simulations.
A tentative coupling with fluid dynamics is then presented: the dynamical system is coupled to a set
of compressible Euler equations supplemented by convection equations on volume, mass and energy fractions of one of the phases.