冰缘区船舶辐射与绕射水动力特性研究

Hydrodynamic force on KCS ship floating near marginal ice zone

为研究冰缘区KCS船舶与水波和海冰的耦合作用,该文基于势流理论描述流体运动,采用弹性薄板模型表征海冰动力学行为,提出了一种冰边缘区KCS船舶辐射与绕射水动力特性分析方法。该方法基于边界元法,根据格林第二定理,利用冰缘区流场脉动点源格林函数,建立了辐射和绕射速度势边界积分方程,同时计及了不规则频率的影响。利用该方法,对典型民船KCS进行了冰缘区辐射与绕射水动力特性研究。研究结果表明,KCS在冰缘区的水动力随波浪频率振荡变化。

The interaction problem of wave with a ship floating near the marginal ice zone is investigated, based on the linear velocity potential theory and thin elastic plate model. The Green function, which satisfies all the boundary condition apart from that on the ship, is introduced through the combination of Fourier integral transform and eigenfunction expansion. Then, a boundary integral equation is established for the diffracted and radiated velocity potentials, and the effect of irregular frequency is removed through an extended boundary integral equation method. Based on boundary element method, together with the expression of the Green function, the oscillatory behaviors of the hydrodynamic force on typical ship KCS are discovered.