消除“不规则频率”的非连续高阶元方法  

Discontinuous higher order boundary element method for removing irregular frequencies

作　　者：孙亮[1] 滕斌[1] 张晓兔[1] 何广华[1] 

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024

出　　处：《海洋工程》2004年第4期51-59,共9页The Ocean Engineering

基　　金：国家杰出青年基金资助项目(50025924;10372020)

摘　　要：针对使用边界元法计算波浪与结构物相互作用时所出现的"不规则频率"现象,采用连续高阶元和部分非连续高阶元对通过修改积分区域所获得的边界积分方程进行离散,有效地消除了"不规则频率"现象的发生。波浪作用下的截断圆柱所受到的水平波浪力和垂向波浪力的数值计算结果验证了该方法的有效性,同时考虑了非连续单元配置点的选择及单元划分数目对消除效果的影响。　 In this paper, the phenomenon of irregular frequencies is dealt with in the course of calculating the interaction between waves and structures. The boundary integral equations obtained by the modified integral domain method are discretized by continuous higher order boundary elements and partial discontinuous higher order boundary elements. By this means, the phenomenon of the irregular frequencies is effectively removed. The numerical results of the horizontal and vertical wave forces acting on a truncated cylinder show the present method has a good validity. At the same time, the position of collocation points and of the effect the number of elements on the elimination of the irregular frequencies are considered in detail.

关 键 词：不规则频率 部分非连续高阶元 边界积分方程 波浪力 

分 类 号：O353.2[理学—流体力学]