Cartesian grid method for numerical simulation of air–oil two-phase flow driven by rotating object

抄録

A Cartesian grid method is developed for air–oil two-phase flows driven by rotating objects by combining the immersed boundary method of the body-force type (IB-BF) and the volume of fluid (VOF) type method. This study focuses on the numerical penetration of fluid phases into solid objects and proposes a simple numerical treatment to reduce this non-physical behavior. The developed method is applied to air–oil two-phase flows driven by a rotating rotor with teeth. The computational results with multiple grid size and time increment conditions were employed to investigate the effects of the proposed numerical treatment on the numerical penetration of the oil into the rotor, the behavior of the oil around the rotor, and the torque acting on the rotor.