基于σ坐标和IBM的大型圆柱波浪力数值模拟  

Numerical Simulation of Wave Forces on Large Circular Cylinder Based on σ-Coordinate and Immersed Boundary Method

作　　者：康啊真 祝兵[1] 邢帆[1] 

机构地区：[1]西南交通大学土木工程学院,四川成都610031

出　　处：《西南交通大学学报》2014年第2期233-239,共7页Journal of Southwest Jiaotong University

基　　金：国家自然科学基金资助项目(51178397);国家科技支撑计划资助项目子课题(2012BAG05B00)

摘　　要：为探讨波浪效应下大型圆柱所受的波浪力,以多层σ坐标变换模型为基础,模拟随时间变化的自由表面,建立了三维波浪与结构物相互作用的数学模型.对三维波浪与大型圆柱波浪力进行了数值模拟,用浸没边界法(IBM)处理不规则结构物表面.结果表明:圆柱波浪力、力矩的数值计算结果与试验结果和理论解吻合,水平波浪力和力矩随波数先增大然后减小,竖向波浪力随波数增大而减小,建立的三维数学模型能够很好地模拟结构物所受的波浪力及力矩.To investigate the wave forces acting on a large circular cylinder under wave effects,a three-dimensional numerical model for the interaction of three-dimensional waves and a structure was established based on the multiple-layer σ-coordinate transformation model used to simulate time-dependent free surface. Wave forces acting on a large circular cylinder were simulated numerically,the immersed boundary method （IBM）was used to deal with the irregular structure surface. The results indicate that the numerical simulation result of wave forces and moment on a large circular cylinder has a good agreement with experimental results and analytical solutions. Horizontal wave force and moment increase at a low wave number and decrease at a high wave number. Vertical force decreases with the increase of wave number. The established numerical model can well simulate wave forces and moment on a structure.

关 键 词：波浪效应 多层σ坐标变换模型 浸没边界法 圆柱 数学模型 

分 类 号：P751[交通运输工程—港口、海岸及近海工程]