Optimization of phase field variables in bubble rise analysis

Sugihara, Kenta ; Onodera, Naoyuki   ; Sitompul, Y.  ; Idomura, Yasuhiro   ; Yamashita, Susumu   

When calculating a flow containing many bubbles, it is difficult to reproduce the flow pattern observed in experiments because bubbles that are close to each other merge numerically in gas-liquid two-phase flow analysis using the conventional interface capturing method. In this study, the Multi-Phase Field method is used to prevent the numerical bubble merging by representing each bubble using an independent fluid fraction function. The applicability of the proposed method is verified by comparing bubbly flow analysis with experimental results.