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	Drag Reducing and Increasing Mechanism on Triangular Riblet Surface
	Feng BB(封贝贝) ; Chen DR(陈大融) ; Wang JD(汪家道) ; Yang XT(杨星团) ; Feng Beibei ; Chen Darong ; Wang Jiadao ; Yang Xingtuan
	2016-03-30 ; 2016-03-30
关键词	riblet surface k-ε turbulence model drag reduction O35
其他题名	Drag Reducing and Increasing Mechanism on Triangular Riblet Surface
中文摘要	Drag reducing and increasing mechanism on riblet surface has been studied through computational fluid dynamics(CFD).Drag reduction is achieved through the optimization of riblet geometry which would affect flow structure inside riblet grooves.Force and flow structure on riblet surface are analyzed and compared with those of smooth surface based on the k-εturbulence model.Drag reducing and increasing mechanism is proved to be related to microvortexes induced inside riblets which lead to Reynolds shear stress reduction significantly and is considered to be the dominant factor resulting in wall friction reduction.Simulation results also show that the pressure drag generating from the deviation of static pressure on the front and rear ends of riblets occurs and grows exponentially with Mach number,which can cause drag increasing.Furthermore,near-wall vortical structures,Reynolds shear stress and static pressure on riblet surfaces are also analyzed in detail.; Drag reducing and increasing mechanism on riblet surface has been studied through computational fluid dynamics(CFD).Drag reduction is achieved through the optimization of riblet geometry which would affect flow structure inside riblet grooves.Force and flow structure on riblet surface are analyzed and compared with those of smooth surface based on the k-εturbulence model.Drag reducing and increasing mechanism is proved to be related to microvortexes induced inside riblets which lead to Reynolds shear stress reduction significantly and is considered to be the dominant factor resulting in wall friction reduction.Simulation results also show that the pressure drag generating from the deviation of static pressure on the front and rear ends of riblets occurs and grows exponentially with Mach number,which can cause drag increasing.Furthermore,near-wall vortical structures,Reynolds shear stress and static pressure on riblet surfaces are also analyzed in detail.
语种	英语 ; 英语
内容类型	期刊论文
源URL	[http://ir.lib.tsinghua.edu.cn/ir/item.do?handle=123456789/143991]
专题	清华大学
推荐引用方式 GB/T 7714	Feng BB,Chen DR,Wang JD,et al. Drag Reducing and Increasing Mechanism on Triangular Riblet Surface[J],2016, 2016.
APA	封贝贝.,陈大融.,汪家道.,杨星团.,Feng Beibei.,...&Yang Xingtuan.(2016).Drag Reducing and Increasing Mechanism on Triangular Riblet Surface..
MLA	封贝贝,et al."Drag Reducing and Increasing Mechanism on Triangular Riblet Surface".(2016).

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