On the evolution of the wake structure produced by a low-aspect-ratio pitching panel [0.03%]
低展弦比攻角机翼表面流动结构的演化研究
James H J Buchholz,Alexander J Smits
James H J Buchholz
Flow visualization is used to interrogate the wake structure produced by a rigid flat panel of aspect ratio (span/chord) 0.54 pitching in a free stream at a Strouhal number of 0.23. At such a low aspect ratio, the streamwise vorticity gener...
Effects of three-dimensionality on thrust production by a pitching panel [0.03%]
攻角振荡平板升力面三维效应的产生机制研究
Melissa A Green,Alexander J Smits
Melissa A Green
To understand the fluid dynamics of a biologically inspired unsteady low-aspect-ratio propulsor, unsteady pressure distributions were measured and compared with time-averaged thrust performance and wake visualizations. The experiments were ...
The wake structure and thrust performance of a rigid low-aspect-ratio pitching panel [0.03%]
低展弦比俯仰平板尾流结构及其推力性能研究
James H J Buchholz,Alexander J Smits
James H J Buchholz
Thrust performance and wake structure were investigated for a rigid rectangular panel pitching about its leading edge in a free stream. For Re(C) = O(10(4)), thrust coefficient was found to depend primarily on Strouhal number St and the asp...
Thrust production and wake structure of a batoid-inspired oscillating fin [0.03%]
受蝙蝠鱼启发的振荡鳍的推力产生及尾流结构研究
R P Clark,A J Smits
R P Clark
Experiments are reported on the hydrodynamic performance of a flexible fin. The fin replicates some features of the pectoral fin of a batoid fish (such as a ray or skate) in that it is actuated in a travelling wave motion, with the amplitud...
Vortex-induced vibrations of two cylinders in tandem arrangement in the proximity-wake interference region [0.03%]
接近尾流干扰区域串联布置的两个圆柱体的涡诱导振动
Iman Borazjani,Fotis Sotiropoulos
Iman Borazjani
We investigate numerically vortex-induced vibrations (VIV) of two identical two-dimensional elastically mounted cylinders in tandem in the proximity-wake interference regime at Reynolds number Re = 200 for systems having both one (transvers...
The Pulsatile Propagation of a Finger of Air Within a Fluid-Occluded Cylindrical Tube [0.03%]
液柱中气指的脉冲传播
Bradford J Smith,Donald P Gaver
Bradford J Smith
We computationally investigate the unsteady pulsatile propagation of a finger of air through a liquid-filled cylindrical rigid tube using a combined boundary element method and lubrication theory approach. The flow-field is governed by the ...
Interaction of lithotripter shockwaves with single inertial cavitation bubbles [0.03%]
体外震波与单一惯性空化气泡的相互作用
Evert Klaseboer,Siew Wan Fong,Cary K Turangan et al.
Evert Klaseboer et al.
The dynamic interaction of a shockwave (modelled as a pressure pulse) with an initially spherically oscillating bubble is investigated. Upon the shockwave impact, the bubble deforms non-spherically and the flow field surrounding the bubble ...
W R C Phillips
W R C Phillips
The inviscid instability of O(ε) two-dimensional free-surface gravity waves propagating along an O(1) parallel shear flow is considered. The modes of instability involve spanwise-periodic longitudinal vortices resembling oceanic Langmuir c...
The growth of bioconvection patterns in a uniform suspension of gyrotactic micro-organisms [0.03%]
均匀的旋转载培养基中生物对流图案的增长
T J Pedley,N A Hill,J O Kessler
T J Pedley
'Bioconvection' is the name given to pattern-forming convective motions set up in suspensions of swimming micro-organisms. 'Gyrotaxis' describes the way the swimming is guided through a balance between the physical torques generated by visc...
Y Zeng,S Weinbaum
Y Zeng
New exact solutions of the Navier-Stokes equations are obtained for the unbounded and bounded oscillatory and impulsive tangential edgewise motion of touching half-infinite plates in their own plane. In contrast to Stokes classical solution...