Simulating fluid-structure interaction in smoothed particle hydrodynamics method

Cui, Xiangda (2018) Simulating fluid-structure interaction in smoothed particle hydrodynamics method. Masters thesis, Memorial University of Newfoundland.

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Abstract

In this thesis, a numerical program based on an improved smoothed particle hydrodynamics (SPH) method has been developed to solve the nonlinear fluid-structure interaction problems. The program simulates breaking free-surface flows and evaluates the global and local hydrodynamic loads on structures. In the present SPH method, the fluid domain is discretized into fluid particles which allows the Euler equation to be numerically solved. A kernel function is employed to interpolate the flow field and the approximate Euler equations explicitly. The solid boundaries are modelled using a fixed ghost particle method. A diffusive term was adopted to smooth the noise in the pressure field. A particle shift technique was adopted and improved by introducing a layer of background particles along the free surface to minimize the interpolation error caused by the anisotropic particle distribution. Validation studies were carried out in three two-dimensional cases including dambreak flow impacting against a vertical wall, water entry of a free-fall wedge, and sloshing flow in a rectangular container excited by roll motions. The numerical results were compared with the experimental results and other published numerical solutions.

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