A phase inversion benchmark for multiscale multiphase flows

A series of benchmarks based on the physical situation of phase inversion between two immiscible liquids is presented. These benchmarks aim at progressing towards the direct numerical simulation of two-phase flows. Several CFD codes developed in French laboratories and using either Volume-of-Fluid or Level-Set interface tracking methods are used to provide physical solutions of the benchmarks, convergence studies and code comparisons. Two typical configurations are retained, with integral scale Reynolds numbers of 1.3710(4) and 4.3310(5), respectively. The physics of the problem are probed through macroscopic quantities such as potential and kinetic energies, or enstrophy. In addition, scaling laws for the temporal decay of the kinetic energy are derived to check the physical relevance of the simulations. Finally the droplet size distribution is probed. Additional test problems are also reported to estimate the influence of viscous effects in the vicinity of the interface. (C) 2021 The Authors. Published by Elsevier Inc.

Automated summary

A series of benchmarks based on the physical situation of phase inversion between two immiscible liquids is presented, aiming at progressing towards the direct numerical simulation of two-phase flows. Several CFD codes developed in French laboratories are used to provide physical solutions, convergence studies, and code comparisons to probe the physics of the problem and validate the physical relevance of the simulations.