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针对波浪与带有窄缝多固定直角箱体结构作用产生的流体共振问题,建立了非线性波浪荷载分析二维时域模型。该模型采用域内源造波技术产生入射波浪,自由水面满足完全非线性运动学和动力学边界条件,窄缝内自由水面引入人工阻尼来等效由于涡旋运动和流动分离引起的粘性耗散,建立边界积分方程并采用高阶边界元离散求解物面上速度势等未知量,进而利用加速度势的方法来求得速度势时间导数,并基于伯努利方程积分得到作用结构上的瞬时波浪荷载。通过模拟带两窄缝的三箱体所受水平力与垂向力,并与已发表结果对比验证了模型的准确性。同时通过大量的数值计算,分析了箱体数量对各箱体所受波浪荷载大小及变化规律的影响。
In order to solve the problem of fluid resonance caused by the interaction between waves and the structure of a multi-fixed rectangular box with a slit, a two-dimensional time-domain model of nonlinear wave loading analysis is established. In this model, the incident wave is generated by using the source wave technique in the domain. The free water surface meets the complete nonlinear kinematic and dynamic boundary conditions. The artificial water dampening is introduced into the free surface in the narrow slot to equal the viscous dissipation due to vortex motion and flow separation, The boundary integral equation is established and the high-order boundary elements are used to discretize the unknowns such as the velocity potential on the object surface. Then the velocity potential time derivative is obtained by using the acceleration potential method. The instantaneous wave load on the structure is obtained by integrating the Bernoulli equation . The accuracy of the model was verified by simulating the horizontal force and vertical force of the three cases with two slits. The comparison with the published results verified the accuracy of the model. At the same time, through a large number of numerical calculations, the influence of the number of boxes on the load and the variation of the wave loads on each box is analyzed.