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Second-Order Wave Diffraction Around 3-D Bodies by A Time-Domain Method   总被引:2,自引:1,他引:1  
BAI  Wei 《中国海洋工程》2001,(1):73-84
A time-domain method is applied to simulate nonlinear wave diffraction around a surface piercing 3-D arbitrary body. The method involves the application of Taylor series expansions and the use of perturbation procedure to establish the corresponding boundary value problems with respect to a time-independent fluid domain. A boundary element method based on B-spline expansion is used to calculate the wave field at each time step, and the free surface boundary condition is satisfied to the second order of wave steepness by a numerical integration in time. An artificial damping layer is adopted on the free surface for the removal of wave reflection from the outer boundary. As an illustration, the method is used to compute the second-order wave forces and run-up on a surface-piercing circular cylinder. The present method is found to be accurate, computationally efficient, and numerically stable.  相似文献   
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三维物体上二阶波浪绕射的实时模拟   总被引:1,自引:1,他引:0  
柏威  滕斌 《海洋工程》2001,19(3):43-50
采用二阶时域理论对非线性波浪在任意三维物体周围的绕射问题进行了研究,对自由表面边界条件进行Taylor级数展开,应用摄动展开可以建立相应的边值问题,而且此边值问题的计算域不随时间变化,运用基于B-样条的边界元方法求解每一时刻的波浪场,二阶自由表面边界条件在时间上进行数值积分,在自由表面加了一个人工阻尼层以避免波浪的反射,速度势分解为已知的入射势和未知的散射势,初始条件采用二阶Stokes波浪场,通过加入物体表面边界条件,得到散射势在时间和空间上的发展,本文对圆柱所受规则波的二阶波浪力和波浪爬高进行了计算,数值结果表明此理论计算准确,效率高,数值稳定。  相似文献   
3.
本文在时域非线性数值波浪水槽中,研究了不同风速条件下极端波浪的特性。采用推板造波的方式生成非线性波浪,基于Jeffrey遮蔽理论将风压项引入自由面动力学边界条件来模拟风压作用,通过高阶边界元法和混合欧拉-拉格朗日时间步进法来求解初边值问题。通过与已发表的聚焦波群实验结果对比验证了该数值模型的准确性,并研究了风压对极端波浪的最大波高、聚焦位置的偏移和波浪谱的演变等波浪性质的影响。本文进一步在数值波浪水槽中引入均匀水流,来模拟风生流对波浪演变的影响。结果表明,风压的存在会少量增大极端波浪的最大波高,波浪的聚焦和解焦过程伴随着明显的能量传递,并且风生流进一步导致了波浪聚焦位置的偏移。  相似文献   
4.
A three-dimensional time-domain potential flow model is developed and applied to simulate the wave resonance in a gap between two side-by-side rectangular barges. A fourth-order predict-correct method is implemented to update free surface boundary conditions. The response of an up-wave barge is predicted by solving the motion equation with the Newmark-β method. Following the validation of the developed numerical model for wave radiation and diffraction around two side-by-side barges, the influence of up-wave barge motion on the gap surfaceresonance is investigated in two different locations of the up-wave barge relative to the back-wave barge at various frequencies. The results reveal that the freely floating up-wave barge significantly influences the resonance frequency and the resonance wave amplitude. Simultaneously, the up-wave barge located in the middle of the back-wave barge leads to a reduction in the resonance wave amplitude and motion response when compared with other configurations.  相似文献   
5.
基于B—样条的边界元方法及其在波浪力计算中的应用   总被引:4,自引:2,他引:2  
柏威  滕斌 《海洋工程》2000,18(4):27-31,35
就波浪与结构物相互作用问题,应用B-样条函数对物体表面上的速度势进行了数值离散,物体表面的控制参数通过最小二乘原理确定,速度势控制参数通过Galerkin理论确定。本理论给 其导数在整个光滑物面上都是连续的。采用此种方法所计算的数值解十分准确,并且收敛得很快。  相似文献   
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