Abstract

An overlapping MPS (Moving Particle Semi-implicit) method is applied into 2D free surface flows. The basic idea of the overlapping MPS method is to distribute the low-resolution particles in the whole domain and the high-resolution particles in the concerned local region, such that the computational cost can be reduced while high-resolution on the concerned local domain can be reached. The low-resolution particles are first solved in the whole domain, which provide the truncation boundary information in solving the refined local region flow. An algorithm to generate dynamically the fine particles in the concerned local region is introduced in the present paper. Validation is carried out against two cases. First, a 2D dam breaking flow is simulated. The water height obtained by the overlapping MPS is compared with traditional MPS and the computational cost is analyzed. To further verify the efficiency of the overlapping technique, solitary wave breaking and post-breaking on a plane slope is also performed. Comparison of the plunging wave and splash-up by using the overlapping MPS and traditional MPS shows that the overlapping MPS can obtain better results than the traditional MPS using entire low-resolution particles, while the CPU time cost is much less than that by using high-resolution particles in the whole domain.

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