关于圆柱绕流水动力特性的大涡数值模拟研究  

Large Eddy Simulation Research on Hydrodynamic Characteristic of Flow around Cylinder

作　　者：谭艳[1] 许栋[2] 白玉川[2] 及春宁[2] 

机构地区：[1]中交第一航务工程勘察设计院有限公司,天津300222 [2]天津大学建筑工程学院,天津300072

出　　处：《港工技术》2013年第3期5-8,共4页Port Engineering Technology

摘　　要：基于有限体积法建立描述不可压缩粘性流体三维运动的数学模型,引入浸入边界法的无滑移固定壁边界条件和大涡数值模拟的Smagorinsky-Lilly亚格子模型,针对层流(Re=100)和湍流(Re=3 900)状态下的圆柱绕流流场进行数值模拟研究,验证结果表明该方法能较有效模拟非定常圆柱绕流流场的形态。在层流状态下圆柱体下游存在形态清晰的卡门涡街结构且无明显的掺混现象;在Re=3 900的湍流状态下圆柱下游的掺混现象显著增强,圆柱下游约1.0 D处的脉动强度达到最大值。Based on finite volume method, a mathematical model is buih to present the 3D motion for incompressible viscous fluid. Numerical simulation research is carried out for the flow-around-cylinder field under the laminar flow （Re =100 ）and turbulent flow （Re =3 900）by introducing and enforcing non-slip solid wall boundary conditions of immersed boundary method and Smagorinsky-Lilly sub-grid model of large eddy simulation. It is proved that the above method simulates unsteady flow around cylinder field well. The downstream flow field of the cylinder shows clear Karman vortexes without mixing under laminar flow. However, under the turbulent flow （Re =3 900）,the downstream flow field of the cylinder presents higher mixing status, the turbulent intensity reaches the maximum value at 1.0D on the downstream side of the cylinder.

关 键 词：大涡模拟 浸入边界法 圆柱绕流 层流 湍流 

分 类 号：TV131.21[水利工程—水力学及河流动力学]