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展向旋转平板Couette湍流中的多态现象
引用本文:夏振华. 展向旋转平板Couette湍流中的多态现象[J]. 空气动力学学报, 2020, 38(1): 118-127
作者姓名:夏振华
作者单位:浙江大学 航空航天学院工程力学系,浙江 杭州 310027
基金项目:国家自然科学基金(11822208,11772297)
摘    要:展向旋转平板Couette湍流(Spanwise rotating plane Couette flow,RPCF)是旋转壁湍流的标模问题之一,在过去的几十年里,被广泛用来研究旋转对壁湍流的统计和流动结构的影响.近些年,作者及其合作者就该问题开展了一系列直接数值模拟研究工作.该研究不仅发现了旋转在低旋转数和高旋转数时对...

关 键 词:展向旋转平板Couette湍流  湍流统计  流动结构  多湍流态

Multiple states in spanwise rotating plane Couette flows
XIA Zhenhua. Multiple states in spanwise rotating plane Couette flows[J]. Acta Aerodynamica Sinica, 2020, 38(1): 118-127
Authors:XIA Zhenhua
Affiliation:(Department of Engineering Mechanics,Zhejiang University,Hangzhou 310027,China)
Abstract:As one of the canonical flow problems in wall-bounded turbulence with system rotation,spanwise rotating plane Couette flow(RPCF)has been studied a lot in the past decades to investigate the rotation effect on the turbulent statistics and flow structures.Recently,the author and his collaborators had performed a series of direct numerical simulations on this flow problem.The results showed that the strong rotation and weak rotation have different impact on the flow structures and turbulent statistics.Furthermore,they have found that multiple states do exist in RPCF.That is,at the same control parameters(Reynolds number and Rotation number),the flow could be at two different flow states,and the flow structures and turbulent statistics at these two states show obvious differences.Their simulation results also showed that the multiple states could exist over a wide rotation number range.Further analysis on the role of secondary flows showed that the secondary flows play different roles in the energy transfer at different states.If the secondary flows are very strong,most of the energy from the mean field will first transfer to the secondary flow and then transfer to the residual field,and the secondary flows acts as a kinetic energy bridge that transfers the energy from the mean field to the residual field.On the other hand,if the secondary flows are not strong enough,most of the kinetic energy will transfer from the mean field to the residual field directly.The present results support the previous conjecture that the large-scale flow structures(the secondary flows)play a very critical role at the multiple states.
Keywords:spanwise rotating plane Couette flow  turbulent statistics  flow structures  multiple states
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