Research On Water Entry Of Wedge Based On The Improved MPS Method With Large Eddy Simulation

Water impact issue has been studied for a long time which involves theimpact loads and free surface deformation. With the development ofcomputer software and hardware, the research on the water impact by themethod of computational fluid mechanics is more and more popular. Gridmethod and meshless method is the two main methods of computationalfluid dynamics. Moving-Particle Semi-Implicit Method (MPS) is a newproposed meshless method based on Lagrange particle concept, which tracesthe velocity、pressure and location of the particles. So that in the simulationof a large deformation surface, MPS can avoid the influence of the gridaccuracy of the calculation, more accurate results can be obtained.This paper attempts to use the improved MPS method based on largeeddy simulation to simulate the water entry impact of wedge. Although theMPS method is capable of simulating large deformation of the free surface,the pressure fluctuation is the weakness of MPS. In order to slow down thepressure fluctuation of the MPS method, we have introduced a new pressurePoisson equation to improve the MPS method. Our previous study verifiedthe effectiveness of the improved MPS method can ease the pressureoscillations in the numerical simulation of the process. This paper will usethe improved MPS method based on large eddy simulation to simulate the flat impact. Numerical experiments show that the the KF1kernel function ismore applicable to the impact simulation.Then we use this method thatbased on KF1kernel function to simulate the water entry of wedges.Theresult is compared with the experimental datas and verifies the validation ofthis method.