海洋工程中直立圆柱波浪爬升问题的数值研究  

Numerical Simulation of Wave Run-up on Cylindrical Offshore Structures

作　　者：唐鹏[1] 于定勇[1] Bai Wei 田艳[1] 

机构地区：[1]中国海洋大学工程学院,山东青岛266100 [2]新加坡国立大学,新加坡119077

出　　处：《中国海洋大学学报（自然科学版）》2016年第10期116-122,共7页Periodical of Ocean University of China

基　　金：国家留学基金委项目(CSC 201306330022)资助~~

摘　　要：本文基于Navier-Stokes方程和连续性方程,利用VOF方法捕捉自由液面和松弛造波法实行造波,建立基于黏性流体理论的三维数值波浪水槽,并在该数值波浪水槽内对圆柱周围的波浪爬升效应进行数值模拟。选用两种不同的波浪参数,探讨波陡参数对柱体周围的波浪爬升效应及其所受载荷的影响。与势流模型相比,本文采用的黏性流模型可以较好的捕捉实验中出现的二次波峰现象。计算表明,本文建立的数值水槽可以较好用于直立圆柱波浪爬升问题的计算。Wave run-up and wave impact can cause unexpected damage to offshore structures.Therefore,the design of offshore structures requires accurate predictions of the maximum wave elevation to maintain sufficient airgap below the platform deck.Accurate prediction of wave run-up can both help reducing building costs and avoid the risk of wave impact and damage to the platform.For the increasing number of offshore platforms built for ocean oil and gas exploration,the investigation of wave run-up becomes more and more significant for the design of fixed offshore structures.In this study,the interaction between wave and a surface-piercing vertical cylinder is investigated numerically based on waveFoam solver,which is developed under the framework of the OpenFOAM,an open source code library writing with fully objectoriented C＋ ＋ language.The governing equations are discretized by using the finite volume method.Two fluids are considered and the volume of fluids（VOF）technique is employed to capture water-air interface.A 3Dnumerical wave tank of the viscous fluid theory was created based on Navier-Stokes equations and continuity equations,used by VOF method to trace free surface and relaxation wave method to generate wave.Meanwhile make use of the 3D wave tank to simulate wave run-up on a vertical cylinder.The model is validated by compare the extreme wave profile with analytical results.Then the simulation of extreme wave-cylinder interactions is carried out.Two different wave parameters was adopted,wave steepness parameters were discussed for the wave effect and run-up around the vertical cylinder.Compared with the potential flow model,viscous flow model used in this paper can better capture the secondary crest phenomenon appeared in the experiments.Calculations show that the numerical tank established in this paper can be better used to solve the problem of wave run-up on cylindrical offshore structures.

关 键 词：波浪爬升 圆柱 数值水槽 OPENFOAM 

分 类 号：TV139[水利工程—水力学及河流动力学]