基于OpenFOAM的异重流数值模拟分析  

Numerical simulation of lock-exchange flow based on OpenFOAM

作　　者：丁伟业 金生[1] 林金波 DING Wei-ye;JIN Sheng;LIN Jin-bo(State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology, Dalian 116024, China)

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,大连116024

出　　处：《水道港口》2020年第1期16-21,共6页Journal of Waterway and Harbor

基　　金：国家自然科学基金项目(51739011);国家重点基础研究发展计划(973计划)(2016YFC0402707)。

摘　　要：由于异重流常常会对港池、船闸、渠道中的航行产生阻碍作用,因此对异重流的研究是十分必要的。文章基于开源CFD软件OpenFOAM对异重流进行了数值模拟分析。通过对膨胀波、内涌浪、Kelvin-Helmholtz不稳定、涡以及前缘高度的研究来了解异重流演化过程中的结构变化。对比四种不同粘性的异重流模拟可以发现,流体粘性对异重流演化过程中的耗散有着明显的影响。流体的粘性越小,异重流演化过程中两种流体界面处的涡越复杂。通过对比异重流演化期间的前缘位置、速度、雷诺数以及弗劳德数可以发现,Minmod方法和SuperBee方法得到结果分别与Berntsen提出的BOM模型和MITgcm模型得到的结果吻合。当流体粘性较小时,采用Minmod方法模拟的异重流耗散现象比SuperBee方法得到的结果更为明显。According to the effect of the lock-exchange flow on the navigation in the harbor basin,the ship lock and the channel,the investigation of the lock-exchange flow is necessary.The numerical simulation of lock-exchange were carried out based on the open source CFD software OpenFOAM.The main features including expansion wave,internal bore,Kelvin-Helmholtz instability,vortices and front head height were well captured and analyzed.It can be found that the viscosity of the fluid has an obvious effect on the dissipation in the evolution of the lock-exchange flow by using different viscous in the numerical simulation.The smaller the fluid viscosity is,the more complex the vortexes at the interface between the two fluids are during the evolution of the lock-exchange flow.The results obtained by the Minmod method and the SuperBee method are in good agreement with those obtained by the BOM model and the MITgcm model proposed by Berntsen,respectively,by comparing the front location,front speed,Reynolds number and Froude number.The dissipation during the evolution of the lock-exchange simulated by the Minmod method is more obvious than that obtained by the SuperBee method when the fluid viscosity is small.

关 键 词：异重流 流场分析 OPENFOAM 

分 类 号：U65[交通运输工程—港口、海岸及近海工程] TV131[交通运输工程—船舶与海洋工程]