Numerical Simulation on Coupling Process of Dual Underwater Gaseous Bubbles near Water Surface

To study the coupling process of dual gaseous bubbles near water surface, a simulation research on single and dual bubbles near water surface based on LS-DYNA was conducted. Compare the experiment results obtaining from high-speed photography with computational simulation results, the simulation model validation was performed. According to further analysis to the results of the simulation model, maximum radius, expansion time and coupling process analyzed from complete bubble morphology were acquired. The results show that the coupling process of the dual bubbles near water surface was not a superposition of two single gaseous bubbles. The lateral contraction speed is slower than that of the single bubble; the time when bubbles reaches the highest point is 1ms delay compared with the single bubble; coupling bubbles during expansion process are merging, and the separate part along the top side of the shrinkage process is obliquely downward.