Overlapping MPS Method for 2D Free Surface Flows

摘要

An overlapping MPS (Moving Particle Semi-implicit) method isrnapplied into 2D free surface flows. The basic idea of the overlappingrnMPS method is to distribute the low-resolution particles in the wholerndomain and the high-resolution particles in the concerned local region,rnsuch that the computational cost can be reduced while high-resolutionrnon the concerned local domain can be reached. The low-resolutionrnparticles are first solved in the whole domain, which provide therntruncation boundary information in solving the refined local regionrnflow. An algorithm to generate dynamically the fine particles in thernconcerned local region is introduced in the present paper. Validation isrncarried out against two cases. First, a 2D dam breaking flow isrnsimulated. The water height obtained by the overlapping MPS isrncompared with traditional MPS and the computational cost is analyzed.rnTo further verify the efficiency of the overlapping technique, solitaryrnwave breaking and post-breaking on a plane slope is also performed.rnComparison of the plunging wave and splash-up by using thernoverlapping MPS and traditional MPS shows that the overlapping MPSrncan obtain better results than the traditional MPS using entire lowresolutionrnparticles, while the CPU time cost is much less than that byrnusing high-resolution particles in the whole domain.