Validation of numerical model for bubble dispersion over a hydrofoil

Abstract

This study presents the direct numerical simulations (DNS) of bubbly wake flows. The DNS with Lagrangian particle dynamics (LPD) model is applied to the cases of bubble dispersion over a cylinder and a hydrofoil. The model validation is performed on the experimental data for the bubble behaviour in the wake of a circular cylinder. It is confirmed that the simulated distributions of bubble stream agree well with the trend of the measurement. The effect of angle of attack of a hydrofoil on the downstream bubble distribution is analysed. It is found that bubble stream deflection increases with increasing angle of attack. These results demonstrate that the joint DNS/LPD model can be applied to produce reasonably good results for the problem of bubbble dispersion over a hydrofoil.