Enhanced Volume Control in Multiphase Fluid Simulations

Abstract. In this work, it is employed the regional level set as a solution to the problem of tracking interfaces in multiphase fluid simulations, with special attention to the treatment of the thin film between distinct phases. In this context, properties of each phase are tracked as they are merged or split, and a new algorithm to apply these operations is proposed. Furthermore, it is brought up two new methods for handling undesired changes in volume or inducing controlled volume changes, being the first a selfish method and the latter a globally optimized one. In both cases, localized volume corrections are performed through the evolution of interfaces based on auxiliary velocities that are estimated near them and are determined from the historical data of the volumetric error. Also, it is defined how the volume of each phase should vary due to fluid inflows or outflows. Finally, particles are generated from small phases that, because of limitations of the adopted discretization, would have disappeared.