  We introduce a meshfree collocation framework to model the phase change from
liquid to vapor at or above the boiling point. While typical vaporization or
boiling simulations focus on the vaporization from the bulk of the fluid, here
we include the possibility of vaporization from the free surface, when a moving
fluid comes into contact with a superheated surface. We present a continuum,
one-fluid approach in which the liquid and vapor phases are modeled with the
same constitutive equations, with different material properties. The novelty
here is a monolithic approach without explicit modeling of the interface
between the phases, neither in a sharp nor diffuse sense. Furthermore, no
interface boundary conditions or source terms are needed between the liquid and
vapor phases. Instead, the phase transition is modeled only using material
properties varying with temperature. Towards this end, we also present an
enrichment of strong form meshfree generalized finite difference methods (GFDM)
to accurately capture derivatives in the presence of jumps in density,
viscosity, and other physical properties. The numerical results show a good
agreement with experimental results, and highlight the ability of our proposed
framework to model phase changes with large jumps.
