Abstract This study investigates the free transverse flow-induced vibration (FIV) of an elastically mounted low-mass-ratio square cylinder in a stream, at three different incidence angles: ${{\alpha }}=0^\circ $ , $20^\circ and $45^\circ . geometric setup presents body with angle attack, sharp corners some afterbody, therefore is generic that can be used to investigate wide range FIV phenomena. A recent by Nemes et al. ( J. Fluid Mech. vol. 710, 2012, pp. 102–130) provided broad overview...

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Abstract This study examines the influence of angle attack a square section cylinder on cylinder’s flow-induced vibration, where direction vibration is transverse to oncoming flow. Our experiments, which traversed velocity–angle parameter space in considerable breadth and depth, show that low-mass ratio body can undergo combinations both vortex-induced galloping. When has an makes it symmetric flow, such as when assumes or diamond orientation, two mechanisms remain independent. However,...

Abstract Previous studies investigating the effect of aspect ratio ( $\mathit{AR}$ ) for insect-like regimes have reported seemingly different trends in aerodynamic forces, however no detailed flow observations been made. In this study, and Reynolds number on structures over wings is explored using a numerical model an altered fruit fly wing revolving at constant angular velocity. Increasing 2.91 resulted development dual leading-edge vortex (LEV) structure, increasing fixed generated same...

Abstract While the wake of a circular cylinder and, to lesser extent, normal flat plate have been studied in considerable detail, wakes elliptic cylinders not received similar attention. However, from first two bodies considerably different characteristics, terms three-dimensional transition modes, and near- far-wake structure. This paper focuses on cylinders, which span these disparate cases. The Strouhal number drag coefficient variations with Reynolds are documented for two-dimensional...

Using equilibrium and nonequilibrium molecular dynamic simulations, we found that engineering the strain on graphene planes forming a channel can drastically change interfacial friction of water transport through it. There is sixfold stress when changes from -10% to 10%. Stretching walls increases shear stress, while compressing reduces Detailed analysis structure reveals essential roles potential energy barrier structural commensurateness between solid first layer. Our results suggest an...

L. F. Thomas, E. I. Sherrard and J. Sheridan, Trans. Faraday Soc., 1955, 51, 619 DOI: 10.1039/TF9555100619

A numerical study of the flow-induced vibration two elastically mounted cylinders in tandem and staggered arrangements at Reynolds number $Re=200$ is presented. The cylinder centres are set a streamwise distance 1.5 diameters, placing rear near-wake region front for arrangement. cross-stream or lateral offset varied between 0 5 diameters. identical, with same elastic mounting, constrained to oscillate only cross-flow direction. variation flow behaviours examined static mountings range spring...

Measurements of the $J=1\ensuremath{\rightarrow}2$ rotational transitions ${\mathrm{N}}^{14}$${\mathrm{F}}_{3}$ and ${\mathrm{N}}^{15}$${\mathrm{F}}_{3}$ yield following molecular nuclear properties. For ${\mathrm{N}}^{14}$${\mathrm{F}}_{3}$, ${\mathrm{B}}_{0}$=10,680.96 Mc/sec., ${I}_{\mathrm{B}}=78.5475\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}40}$ g ${\mathrm{cm}}^{2}$; for ${\mathrm{N}}^{15}$${\mathrm{F}}_{3}$, ${\mathrm{B}}_{0}$=10,629.35...

The pure rotational spectra of trifluoromethyl bromide, iodide, and cyanide have been studied in the microwave region. B0 values Mc/sec were determined as follows: 2098.06 for CF3Br79; 2078.50 CF3Br81; 1523.23 CF3I; 2945.535 CF3CN14; 2855.859 CF3CN15. nuclear quadrupole couplings, eQq, are Mc/sec: 619 Br79; 517 Br81; −2150 I127; −4.70 N14. With any reasonable assumption bond angles, dCF is found to be 1.33±0.015A each molecule. other distances depend more strongly on angles. ∠FCF assumed...

From measurements of pure rotational transitions in the microwave region following B0 values Mc/sec were determined: 4594.25±0.04 for PO16F3, 4395.27±0.20 PO18F3, 2657.63±0.04 PS32F3, 2614.73±0.04 PS33F3, 2579.77±0.04 PS34F3, 2015.20±0.05 PO16Cl335, 1932.38±0.08 PO16Cl337, 1402.64±0.05 PS32Cl235, 1355.72±0.05 PS32Cl337, 1370.13±0.05 PS34Cl335. With aid electron diffraction results molecular structures have been determined as follows: POF3, dPO=1.45±0.03A, dPF=1.52±0.02A and ∠FPF=102.5°±2°;...

The wake states from a circular cylinder undergoing controlled sinusoidal oscillation transverse to the free stream are examined. As frequency of passes through natural Kármán there is transition between two distinctly different states: low- and high-frequency states. corresponds change in structure near also characterized by jump phase amplitude both total vortex lift. Over range flow parameters studied exhibit number universal features. phases lift drag forces have characteristic values...

Flow past a cylinder beneath free surface gives rise to fundamental classes of nearwake structure that are distinctly different from the wake completely submerged cylinder. A central feature is generation vorticity layer due to: localized separation, in form small-scale breaking free-surface wave; or complete separation surface. This appears adjacent cylinder, thereby forming jet-like flow. It shown instantaneous flux on either side this jet rapidly balanced immediately after onset

The stable molecular conformations of methyl-fluoroformate, -propiolate, -cyanoformate, -acrylate (cis) and -acetate have been shown to be planar, for the latter four compounds cis ester skeleton has established. Barriers internal rotation methyl group were measured from splittings microwave lines each compound. [XCOOCH3; X = F, V3= 1077; HCC, 1266; CN, 1172; CH3, 1215; CH2CH, 1220 (values V3 in cal/mol).] For acetate a value 307 ± 50 cal/mol acetyl was calculated spectrum CD3COOCD3. dipole...