Numerical Simulation of Two-Phase Flow Using Coupled Level-Set and Volume-of-Fluid Method

Up to now, researchers have been proposing various approaches to simulate two-phase flow in order to investigate physical phenomena such as wave breaking and wind-wave interaction. A fundamental aspect of simulating two-phase flow involves defining the physical characteristics of the two distinct fluids present; a technique known as interface construction is widely used to tackle the problem. Level-set and volume-of-fluid methods represent two widely employed methods for establishing an interface between multiple fluids while conserving mass. In this research, a hybrid approach is proposed as a coupled level-set and volume-of-fluid method, effectively combining the strengths of both methods. This research confirmed the reliability of the algorithm through validation with a benchmark case, which was conducted with a Zalesak's rotating notched disc. The simulation was validated by comparing the interface shape with the original one, and the level-set norm and mass norm order were found to be approximately 10^–4 and 10^–15, respectively. Moreover, an immersed boundary method was formulated to explore the interaction between dam-break flow and an obstacle.