Resolving subgrid scale structures for multiphase flows using the moment-of-fluid method

Multiphase flows are present in many industrial and engineering applications as well as in some physical phenomena. Capturing the interface between the phases for complex flows is challenging and requires an accurate method, especially to resolve fine-scale structures. The moment-of-fluid (MOF) method improves drastically the accuracy of interface reconstruction compared to previous geometrical methods. Instead of refining the mesh to capture increased levels of detail, the MOF method, which uses zeroth and first moments as well as a conglomeration algorithm, enables subgrid structures such as filaments to be captured at a small extra cost. This novel filament MOF method, coupled to a finite volume Navier-Stokes solver, has been tested on a fixed grid and validated using well-known benchmarks such as the Rayleigh-Taylor and the Kelvin-Helmholtz instability problems. Good agreement has been found with benchmark results in the literature and with experimental measurements.