IMECH-IR  > 非线性力学国家重点实验室
Lift enhancement on spanwise oscillating flat-plates in low-Reynolds-number flows
Wang SZ(王士召); He GW(何国威); Zhang X(张星)
Source PublicationPhysics of Fluids
2015
Volume27Issue:6Pages:061901
ISSN1070-6631
AbstractNumerical simulations are performed to study the influence of spanwise oscillations on the three-dimensional flows around low-aspect-ratio flat-plates at a low Reynolds number of 300. The harmonic spanwise oscillations of the plate are controlled by two parameters: the reduced frequency  and the dimensionless amplitude . It is found that in a certain range of the parameter space (), spanwise oscillations are effective in enhancing the average lift and augmenting the average lift-to-drag ratio. To elucidate the mechanism of lift enhancement due to the spanwise oscillations, the wake structures behind flat-plates with and without spanwise oscillations are compared. It is observed that the spanwise oscillation stabilizes the leading-edge vortex and presses it to a place very close to the upper surface. Since a leading-edgevortex corresponds to a low-pressure core, the stably attached leading-edge vortex benefits liftproduction. This lift-enhancement mechanism is also verified by using a simplified lift formula which links the lift force with the Lamb vector term. The imposed spanwise oscillation is found to enhance the vorticity transport along the spanwise direction, which in turn improves thestability of the leading-edge vortex. The results of this study provide new insight into the counterintuitive high-lift in the gliding flights of tree snakes.
DOI10.1063/1.4922236
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Indexed BySCI ; EI
Language英语
WOS IDWOS:000357688800007
WOS KeywordLEADING-EDGE VORTICES ; IMMERSED BOUNDARY METHOD ; CHRYSOPELEA-PARADISI ; GLIDING FLIGHT ; WAKE STRUCTURE ; FLYING SNAKE ; WINGS ; PERFORMANCE ; KINEMATICS
WOS Research AreaMechanics ; Physics
WOS SubjectMechanics ; Physics, Fluids & Plasmas
DepartmentLNM湍流
Classification一类/力学重要期刊
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/50520
Collection非线性力学国家重点实验室
Recommended Citation
GB/T 7714
Wang SZ,He GW,Zhang X. Lift enhancement on spanwise oscillating flat-plates in low-Reynolds-number flows[J]. Physics of Fluids,2015,27(6):061901.
APA Wang SZ,He GW,&Zhang X.(2015).Lift enhancement on spanwise oscillating flat-plates in low-Reynolds-number flows.Physics of Fluids,27(6),061901.
MLA Wang SZ,et al."Lift enhancement on spanwise oscillating flat-plates in low-Reynolds-number flows".Physics of Fluids 27.6(2015):061901.
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