【摘要】 椭圆余弦波是一种常见的浅水非线性波,对近岸区海床的稳定性有重要影响。本文根据有限体积法原理,基于开源流体力学计算平台OpenFOAM,利用C++语言编制了波致无粘性土海床响应的数值计算程序,联合波浪数值模拟软件,对椭圆余弦波作用下海床的瞬态响应、累积响应及其渐进液化特征进行了分析。与线性波作用下海床响应计算结果的对比分析表明,椭圆余弦波会明显增大海床瞬态孔隙水压力和应力幅值,进而显著促进海床内孔隙水压力的累积和液化深度的发展。在近岸浅水区海床的响应分析尤其是海床累积响应的分析中,波浪的非线性效应不容忽视。更多还原

【Abstract】 Cnoidal wave is a kind of main nonlinear waves in shallow water area, which has a significant influence on seabed instability. To date, some characteristics of cnodial wave-induced oscillatory seabed response have been investigated. However, the accumulated pore water pressure and the progressive liquefaction within sandy and silty seabed are lack of concerns. Based on the principle of finite volume method and the open source environment of fluid dynamics, OpenFOAM, the numerical simulation program for wave-induced non-cohesive seabed response is developed using C++ language. Combined with the software for wave simulation, the seabed oscillatory response, accumulated response and the progressive liquefaction due to cnoidal wave have been investigated. Comparison results with seabed response under linear wave have shown that cnodial wave would obviously increase the amplitude of pore water pressure and stresses in soil, which accelerates the accumulation of pore water pressure and deepen the liquefied zone in a great degree, implying that the nonlinear effect of waves cannot be ignored for seabed response, especially for accumulated seabed response in shallow water area.更多还原