A volume of fluid framework for interface-resolved simulations of
vaporizing liquid-gas flows
release_ymfn2y7d6jhufhoicippfz7uiy
by
John Palmore Jr, Olivier Desjardins
2019
Abstract
This work demonstrates a computational framework for simulating vaporizing,
liquid-gas flows. It is developed for the general vaporization problem which
solves the vaporization rate based as from the local thermodynamic equilibrium
of the liquid-gas system. This includes the commonly studied vaporization
regimes of film boiling and isothermal evaporation. The framework is built upon
a Cartesian grid solver for low-Mach, turbulent flows which has been modified
to handle multiphase flows with large density ratios. Interface transport is
performed using an unsplit volume of fluid solver. A novel, divergence-free
extrapolation technique is used to create a velocity field that is suitable for
interface transport. Sharp treatments are used for the vapor mass fractions and
temperature fields. The pressure Poisson equation is treated using the Ghost
Fluid Method. Interface equilibrium at the interface is computed using the
Clausius-Clapeyron relation, and is coupled to the flow solver using a
monotone, unconditionally stable scheme.
It will be shown that correct prediction of the interface properties is
fundamental to accurate simulations of the vaporization process. The
convergence and accuracy of the proposed numerical framework is verified
against solutions in one, two, and three dimensions. The simulations recover
first order convergence under temporal and spatial refinement for the general
vaporization problem. The work is concluded with a demonstration of unsteady
vaporization of a droplet at intermediate Reynolds number.
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