Addition of dynamic mooring line force based on lumped-mass method in SPH

摘要

Smoothed particle hydrodynamics (SPH) method is widely recognized as the accurate approach to predict the fluid-structure interaction. However, the lack of mooring force in the program severely limits its research on the motion response of floating structures. In this paper, based on the dynamic analysis theory of the lumped-mass method, combined simultaneously with the characteristics of SPH method, a dynamic mooring force calculation method suitable for SPH is proposed as follows: The mooring line is divided into a series of virtual particles, which contains the inherent attribute parameters of the mooring line, and embeds it in the SPH program. The force of each virtual particle is calculated and then coupled with the motion equation for the hull at each time step. The numerical method has been validated with the results of the flume test. Numerical simulations are examined so as to determine the hydrodynamic performance and interaction of breakwater with surfaces waves. Finally, the effects of the structural width and wave characteristics on wave attenuating effect are studied.