亚临界雷诺数下V型沟槽圆柱减阻数值模拟  

Numerical Simulation of Drag Reduction of V-Grooved Circular Cylinder at Subcritical Reynolds Number

作　　者：钱权[1] 王国荣[1] QIAN Quan;WANG Guo-rong(College of Mechanical and Electrical Engineering,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]西南石油大学机电工程学院,四川成都610500

出　　处：《海洋科学进展》2019年第1期150-160,共11页Advances in Marine Science

基　　金：中国工程院战略咨询重点项目-我国深水工程技术和深水装备发展战略研究--海底浅层天然气水合物与矿产资源开发战略研究(2017-XZ-10-02-02);国家自然科学基金项目--油气装备摩擦副仿生表面织构抗磨减阻机理与设计理论研究(51775463)

摘　　要：为了深入研究亚临界雷诺数下光滑和沟槽圆柱绕流阻力及流场特性。采用SSTk-w模型对雷诺数Re分别为2×104,6×104,1×105和1.4×105的光滑圆柱和V型沟槽圆柱绕流进行三维流场数值模拟,首先以光滑圆柱绕流为算例与相关实验研究结果进行了对比,验证了SSTk-w方法的准确性,然后在不同雷诺数条件下,开展了V型沟槽圆柱绕流数值模拟研究;与光滑圆柱相比,V型沟槽圆柱具有较好的减阻效果,最大减阻率达28.4%;在相同雷诺数下,沟槽圆柱表面边界层分离点与光滑圆柱表面分离点相比更靠后。V型沟槽织构可有效改变尾流区旋涡脱落频率和尾流区湍流的发展,为隔水管减阻和提高隔水管柱系统的稳定性提供参考。The SST k-w model is used to study the three-dimensional flow field and drag of smooth cylinder and V-grooved cylinder at subcritical Reynolds numbers: Re =2×10^4, Re =6×10^4, Re =1×10^5, Re = 1.4× 10^5. Firstly, the flow around a smooth cylinder is simulated and compared with experimental results, and the accuracy of the SST k-w model is validated. Secondly, the numerical simulation of the flow around V-grooved cylinder is conducted at different Reynolds numbers. Compared with the smooth cylinder, the V-grooved cylinder shows better drag reduction effect with maximum drag reduction being 28.4%, and the separation point of the boundary layer of the V-grooved surface is more backward than that of the smooth cylinder when at the same Reynolds number. The V-grooved texture can effectively change the vortex shedding frequency and the development of turbulence in the wake zone, and this provides useful information for the drag reduction and the improvement of stability of the riser system.

关 键 词：圆柱绕流 SSTk-w模型 V型沟槽圆柱 减阻 隔水管 

分 类 号：O357.5[理学—流体力学]