Simulation of complex flow of multi-droplet impingement on a free surface by δ-SPH method
Based on the δ-SPH method,the multi-droplet impingement on a free surface is simulated and analyzed.First,by adding a density dissipation term and an artificial viscous term in the governing equations,the spurious numerical oscillations in pressure can be removed and the stability of the numerical scheme is ensured.Then,the impact of a single droplet on a free surface is simulated,and the reliability of the δ-SPH method is verified by comparison with the results reported in the literature.Finally,two droplets with a vertical/horizontal distribution,four droplet's with a rhombus distribution,which impinge on a free surface,are simulated,and the effects of the droplet vertical/horizontal travel.on the impact structure are analyzed.The numerical results show that:the δ-SPH method can exactly capture the strong-nonlinearity phenomena such as splashing,large-amplitude sloshing and discontinuous free surface when multi-droplets impinge on a free surface,and a smooth pressure field is also obtained.
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