基于SPH方法沉箱式防波堤的数值研究  

Numerical Study of Caisson Breakwaters based on SPH Method

作　　者：姜峰[1] 唐晓成[1] 任冰[1] 陈洪洲[1] 张莉[1] 

机构地区：[1]大连理工大学建设工程学部,辽宁大连116024

出　　处：《沈阳建筑大学学报（自然科学版）》2013年第5期828-833,共6页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(51179030)

摘　　要：目的研究数值模拟波浪作用的随机历时过程,为箱式防波堤的受力特点提供一种新的研究途径.方法对波浪采用光滑粒子流体动力学方法即一种无网格粒子法(SPH)进行仿真模拟,对防波堤结构进行动力时程分析.分别将波浪和沉箱式防波堤离散成粒子,将传统的拉格朗日方程用核函数的形式表示,并编制二维程序模拟波浪的水动力特性.提取了SPH中防波堤离散粒子的分析结果,引入到有限元ANSYS程序中对防波堤进行有限元动力时程分析.结果 SPH方法能考虑波浪荷载的随机特性,使模拟规则波作用于结构上的随机动力荷载更为准确.对防波堤结构采用有网格的有限元元分析方法,使防波堤这一结构的波浪随机动力响应的研究方法成为现实.结论运用无网格方法可以实现模拟波浪的非线性特性,也能使水动力这一复杂的工况更加逼真的模拟,从而得到防波堤结构的内力的时程变化,也能相应得出防波堤结构的动力响应.进而为复杂海洋工程结构在波浪作用下的动力响应研究提出了一种可行性的研究方法.Numerical simulation of the random process of the wave function has been done, and a new avenue of research has also been provided for mechanical characteristics of the box-type breakwater. Waves has been simulated with a smooth particle hydrodynamics method which is a non-mesh particle method （ SPH）, and breakwater structures has been analyzed in a dynamic time-history way. Respectively, waves and caisson breakwater was discreted into particles, the traditional Lagrange equations was denoted in the form of kernel function. However, a program has been prepared to simulate wave-dimensional hydrodynamic charac- teristics. Extracting the SPH breakwater discrete particle analysis results into the finite element program AN- SYS finite element for the breakwater dynamic analysis. SPH method can consider the random nature of wave loads, so that the simulation of the regular waves on the structure of the random dynamic loads was more accurate. To make this structure breakwater wave stochastic dynamic response of the research method become a reality, a finite element mesh element analysis methods on the breakwater structure has been used. Meshless method not only can simulate wave nonlinear characteristics, but also make the hydrodynamic con- ditions of this complex a more realistic simulation of the structure, and make the breakwater time course of changes in force obtain corresponding power draw breakwater the response of the structure. Further, a feasi- bility method of the study has been presented on complex dynamic response research under wave action of offshore structures.

关 键 词：SPH 核函数 防波堤 时程分析 

分 类 号：TV139.26[水利工程—水力学及河流动力学]