  A series of benchmarks based on the physical situation of "phase inversion"
between two immiscible liquids is presented. These benchmarks aim at
progressing toward 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 13.700 and
433.000, 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.
