壁面に隣接する単一大型気泡に対する乱流チャンネルの数値シミュレーション

抄録

Injection of bubbles into a turbulent boundary layer has multiple impacts. And frictional drag reduction is a phenomenon from their combined effect. In numerical way for drag reduction by injecting bubbles, recent works have been targeted small bubble which is below Weber number 1. Although several systems have been developed based on these bubbles, it has some difficulties in applying in practice. Thus, to solve this problem, we approached from other aspects, such as relatively large bubbles. Thus, the research objectives are checking the capability of simulation on large bubble, which is high We number over 100, and understanding its characteristic. In the case of numerical condition, it was divided into 3 stage. (generating turbulent channel flow, Injecting bubble, simulation on turbulent channel flow with large bubble) The numerical results exhibit good agreement with experimental results on the bubble shape.