Salar Zamani Salimi - Simulations of interfaces in phase-changing flows

Heat and mass transfer occurs in several natural flows, as well as in many industries. This process is multiscale by nature: the chemistry at the interfaces affects the macroscopic system behavior (e.g. heat transfer coefficients) and the large-scale flow structures determine the details of the local mass and energy fluxes; as example, multicomponent droplet evaporation displays a complex interplay between density, concentration and temperature gradients. The talk will focus on recent advancements in modelling heat and mass transfer in laminar and turbulent flows. We explore various interface capturing methods, including diffuse-interface and sharp-interface approaches, and their coupling with phase-change models to account for interfacial heat and mass exchange. Specifically, we present a formulation based on the diffuse-interface Baer-Nunziato models, where mass transfer is driven by chemical potential disequilibrium. A pressure-based formulation is employed to mitigate time step restrictions while maintaining complex thermodynamic accuracy. Simulations of evaporative flows will be showcased, comparing the performance of diffuse-interface methods with sharp-interface approaches.