The water surface wave radiation problem caused by multiple cylinders oscillating with identical frequency was solved in frequency domain by the boundary element method using simple Green's function in the inner w...The water surface wave radiation problem caused by multiple cylinders oscillating with identical frequency was solved in frequency domain by the boundary element method using simple Green's function in the inner water region combined with the eigenfunction expansions in the outer water region. The numerical method is suitable to the situation of constant depth of outer regions and complicated boundary conditions of inner region, while the oscillating modes, motion amplitudes and phases of the cylinders may be different from one another. The second order potential and hydrodynamic forces acting on each cylinder were evaluated completely by perturbation method. Compared with the case of single oscillating cylinder, hydrodynamic interference phenomena, such as wave resonance and negative added mass, of the radiation problem due to the oscillatory motions of multiple cylinders are identified which is of engineering importance to the design of moorings and other facilities involving multiple structures.展开更多
以适用于南海海域作业的圆筒型浮式钻井生产储卸油系统(Floating Drilling Production Storage and Offloading System,FDPSO)为对象,研究不同阻尼板锥角下FDPSO垂荡和纵摇幅值变化规律。基于三维势流理论计算FDPSO所受波浪载荷,施加由...以适用于南海海域作业的圆筒型浮式钻井生产储卸油系统(Floating Drilling Production Storage and Offloading System,FDPSO)为对象,研究不同阻尼板锥角下FDPSO垂荡和纵摇幅值变化规律。基于三维势流理论计算FDPSO所受波浪载荷,施加由不同方法计算得到的黏性阻尼,计算FDPSO的运动响应传递函数,采用谱分析方法预报垂荡、纵摇运动,计算不同锥角下二阶波浪载荷引起的纵摇运动响应。计算结果表明:圆筒型FDPSO垂荡运动相对较强,不过抗摇性能良好;阻尼板锥角的增大不利于FDPSO垂荡和纵摇运动响应的控制,二阶波浪载荷对圆筒型FDPSO纵摇运动响应具有较大的影响,应给予关注。展开更多
文摘The water surface wave radiation problem caused by multiple cylinders oscillating with identical frequency was solved in frequency domain by the boundary element method using simple Green's function in the inner water region combined with the eigenfunction expansions in the outer water region. The numerical method is suitable to the situation of constant depth of outer regions and complicated boundary conditions of inner region, while the oscillating modes, motion amplitudes and phases of the cylinders may be different from one another. The second order potential and hydrodynamic forces acting on each cylinder were evaluated completely by perturbation method. Compared with the case of single oscillating cylinder, hydrodynamic interference phenomena, such as wave resonance and negative added mass, of the radiation problem due to the oscillatory motions of multiple cylinders are identified which is of engineering importance to the design of moorings and other facilities involving multiple structures.
文摘以适用于南海海域作业的圆筒型浮式钻井生产储卸油系统(Floating Drilling Production Storage and Offloading System,FDPSO)为对象,研究不同阻尼板锥角下FDPSO垂荡和纵摇幅值变化规律。基于三维势流理论计算FDPSO所受波浪载荷,施加由不同方法计算得到的黏性阻尼,计算FDPSO的运动响应传递函数,采用谱分析方法预报垂荡、纵摇运动,计算不同锥角下二阶波浪载荷引起的纵摇运动响应。计算结果表明:圆筒型FDPSO垂荡运动相对较强,不过抗摇性能良好;阻尼板锥角的增大不利于FDPSO垂荡和纵摇运动响应的控制,二阶波浪载荷对圆筒型FDPSO纵摇运动响应具有较大的影响,应给予关注。
