摘要
溃坝是一种瞬时的、带有巨大破坏作用的灾害性过程,该现象与船舶航行中发生的砰击类似,对航行安全具有较大的影响.论文基于开源软件OpenFOAM建立简化的三维溃坝数值模型.求解守恒型N-S方程,采用有限体积法离散,并用PIMPLE算法求解.对流动中湍流现象的处理采用DNS及RAS两种方式,并耦合VOF方法实现自由液面的捕捉.模拟溃坝与不同形式结构物的相互作用,并将数值计算结果与试验数据对比,验证了模型的有效性.比较了DNS和RAS的数值结果,研究了下游结构物的溃坝荷载及不同时刻自由液面的形状,得到结构物溃坝荷载随时间的变化及不同时刻流态的分布,可为船舶及近岸结构物的设计提供参考.
Dam-break is a disastrous phenomenon with huge damage within a few milliseconds, which is similar to the slamming induced by ship navigation, and has a significant effect on the safety of ship structures. Based on OpenFOAM, a 3-D dam-break model coupled with the VOF method is established to solve conservative N-S equations. Equations are discretized using the finite volume method and solved by the algorithm PIMPLE. Both DNS and RANS models are applied to the turbulence. Numerical simulation of interaction between the dam-break and the structures is compared with the experimental data to verify the effectiveness of the present OpenFOAM models. Numerical results by DNS and RAS are compared. Dam-break force on downstream structures and the free interface at different time is obtained. This work aims to provide a reference for the design of ship and coastal structures.
作者
牟迪
陈丽芬
宁德志
MU Di;CHEN Lifen;NING Dezhi(State Key Laboratory of Coastal and Ofifehore Engineering,Dalian University of Technology Dalian 116024,China)
出处
《中国造船》
EI
CSCD
北大核心
2020年第S02期231-239,共9页
Shipbuilding of China
