中文摘要：

为深入研究椭圆沉箱的水动力特性,建立了非线性波浪与结构物相互作用的三维时域数值计算模型,该模型中N-S方程的求解基于有限差分法,采用VOF方法追踪流体自由表面,使用部分单元体方法处理椭圆沉箱结构物的曲面边界,用计算圆沉箱波浪力对该模型进行了验证,并将该模型应用于相对波高（H/d）、相对波长（k D）和相对长宽比（B/D）对椭圆沉箱波浪力的影响研究。结果表明：相对波高对椭圆沉箱波浪力有重要影响,其值越大波浪非线性的影响越明显;与沉箱无量纲正向波浪力相比,相对长宽比对无量纲横向波浪力影响更大。研究表明,本研究中建立的数值模型可应用于椭圆沉箱波浪力的计算,但实际设计中需依据建设地点的风浪特征与掩护条件,确定合适的沉箱相对长宽比,以保证结构足够的安全系数。

英文摘要：

A three dimensional numerical model of interaction of nonlinear wave with structures was developed in this paper to investigate the wave force on ellipse caisson. Navier-Stokes equations were established by a finite difference method,the problem of structure surface boundary was dealt by a partial cell method and the volume of fluid （VOF） method was employed to trace the free surface. The numerical model was verified by calculation of the wave force on circular caisson,and is used to investigate the effects of the relative wave height （ H/d ）, relative caisson width （kD）,and relative length-width ratio （B/D） on the wave forces of the ellipse caisson. it was shown that the relative wave height had a significant effect on the wave forces of the caisson,with the increase in the relative wave height, with more obvious nonlinear characteristics. Compared with the non - dimensional inline wave force, the relative length - width ratio was found to have significant influence on the non - dimensional transverse wave force. Since it is very important to consider the characteristics of wind wave and sheltering conditions for selecting the appropriate relative length-width ratio, ensuring the structure having enough safety coefficient, the numerical model in this paper can be used to calculate the wave force on ellipse caisson.