1 research outputs found
A volume-of-fluid method for interface-resolved simulations of phase-changing two-fluid flows
We present a numerical method for interface-resolved simulations of
evaporating two-fluid flows based on the volume-of-fluid (VoF) method. The
method has been implemented in an efficient FFT-based two-fluid Navier-Stokes
solver, using an algebraic VoF method for the interface representation, and
extended with the transport equations of thermal energy and vaporized liquid
mass for the single-component evaporating liquid in an inert gas. The
conservation of vaporizing liquid and computation of the interfacial mass flux
are performed with the aid of a reconstructed signed-distance field, which
enables the use of well-established methods for phase change solvers based on
level-set methods. The interface velocity is computed with a novel approach
that ensures accurate mass conservation, by constructing a divergence-free
extension of the liquid velocity field onto the entire domain. The resulting
approach does not depend on the type of interface reconstruction (i.e.\ can be
employed in both algebraic and geometrical VoF methods). We extensively
verified and validated the overall method against several benchmark cases, and
demonstrated its excellent mass conservation and good overall performance for
simulating evaporating two-fluid flows in two and three dimensions