两层黏性流体中直立圆柱体绕流的三维数值模拟  

Three-dimensional numerical simulation of the viscous flow around a vertical circular cylinder in a two-layer fluid

作　　者：尹德操[1] 尤云祥[1] 魏岗[1] 

机构地区：[1]上海交通大学船舶海洋与建筑工程学院,上海200030

出　　处：《水动力学研究与进展（A辑）》2008年第1期1-6,共6页Chinese Journal of Hydrodynamics

基　　金：国家自然科学基金(10572092);国家“863”项目(2006AA09A109-6);高等学校博士点基金资助项目。

摘　　要：研究了两层流体中直立贯底圆柱体的三维黏性绕流问题。以不可压缩Navier-Stokes方程为控制方程,应用VOF方法追踪两层流体的内界面,建立了该问题的数值模拟方法。成功地数值模拟了两层流体中圆柱体黏性绕流产生的三维尾涡特征,表明了流体的密度分层效应对直立贯底圆柱体的尾涡特性和阻力系数都是有影响的。在海洋立管涡激振动的研究中,考虑流体的密度分层效应是重要的。The viscous flow around a vertically bottom-mounted circular cylinder in an incompressible two-layer fluid is studied numerically. The Navier-Stokes equations are taken as the governing equations while the VOF method is used to track the interface of the two-layer fluid. A numerical method for the problem was presented. The three-dimensional characteristics of the wake vortex due to the viscous flow around the vertical circular cylinder were simulated. The results were compared with the cases for a single-layer fluid, showing that the density stratification can have relatively large effects on the vortex shedding as well as the drag coefficient of the vertical circular cylinder. Therefore, it is important to consider the effect of the density stratification on the vortex-induced vibration of marine risers.

关 键 词：两层流体 黏性流 三维漩涡 直立圆柱 

分 类 号：U661.1[交通运输工程—船舶及航道工程]