基于NURBS边界元法的波浪荷载计算研究

Study of calculation of wave loads using NURBS-based BEM

应用基于NURBS的边界元法对船舶在波浪中的运动和荷载计算进行了研究.基于NURBS边界元法原理编制了相应的边界元法计算程序.对构建线性方程组的配点法和Galerkin法进行了比较,验证了两种方法的计算精度,结果表明Galerkin法计算结果的精度要好于配点法.使用基于NURBS的边界元法和频域三维移动脉动源格林函数,对一艘集装箱船在波浪中的运动和受到的波浪弯矩进行了计算,计算结果同已有的实验结果和数值计算结果符合良好.

Using the NURBS-based boundary element method,motions and wave loads of ship on waves are calculated. An efficient NURBS approach based on boundary element program is developed firstly and the accuracy of the collocation point method and the Galerkin method are compared. The results show that the Galerkin method is more accurate than the collocation point method. The NURBS-based boundary element method and the Green-function of three-dimensional translating and pulsing source are used in the calculation of motions and wave-induced bending moments on a container ship with forward speed. The calculation results agree well with the experimental results and other numerical results.