A low Mach number diffuse-interface model for multicomponent two-phase flows with phase change
Year: 2024
Type: article
Abstract: This study introduces a four-equation, two-phase diffuse interface model designed to simulate two-phase,low-Mach flows with phase change. The model is extended to multicomponent gas by incorporating anadditional equation for the vapor mass fraction transport. The methodology accounts for interfacial masstransfer driven by differences in the chemical potentials of the phases. A distinctive feature of our modelis its ability to discretely conserve the mass of each phase, total momentum, and total enthalpy, whilemaintaining a steady interface thickness, which is critical for the numerical stability and accuracy of two-phase flow simulations. Furthermore, the model effectively handles high density and viscosity ratios, makingit robust across a wide range of applications. In addition to the general model suited for weakly compressiblecomponents, we also present a reduced model for fully incompressible components. The numerical methodsare verified against several established benchmarks for fully incompressible systems with mass transfer. Thelow-Mach formulation is validated against sharp-interface simulations of the same problem; the results of athree-dimensional simulation of a sedimenting droplet undergoing evaporation are also illustrated.
Source: Journal of Computational Physics
Language: English
Subfield: Computational Mechanics
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,860
OpenAlex ID: W4405527622