  This paper proposes a comparison of four popular interface capturing methods
: the volume of fluid (VOF), the standard level set (SLS), the accurate
conservative level set (ACLS) and the coupled level set and volume of fluid
(CLSVOF). All methods are embedded into a unified low-Mach framework based on a
Cartesian-grid finite-volume discretization. This framework includes a sharp
transport of the interface, a wellbalanced surface tension discretization and a
consistent mass and momentum transport which allows capillary-driven
simulations with high density ratio. The comparison relies on shared metrics
for geometrical accuracy, mass and momentum conservation which exposes the
weakness and strengths of each method. Finally, the versatility and
capabilities of the proposed solver are demonstrated on the simulation of a 3D
head-on collision of two water droplets. Overall, all methods manage to
retrieve reasonable results for all test cases presented. VOF, CLSVOF and ACLS
tend to artificially create little structures while SLS suffers from
conservation issues in the mesh resolution limit. This study leads us to the
conclusion that CLSVOF is the most promising method for two-phase flow
simulations in our specific framework because of its inherent conservation
properties and topology accuracy.
