http://scitation.aip.org/ Physics of Fluids: All Topics http://link.aip.org/link/?PHF/21/116603/1&agg=rss George Chamoun, Eva Kanso, and Paul K. Newton<br/> We consider streamline patterns associated with single and double von Karman point vortex streets on the surface of a nonrotating sphere, with and without pole vortices. The full family of streamline patterns are identified and the topological bifurcations from one pattern to another are depicted as ... [Phys. Fluids 21, 116603 (2009)] published Fri Nov 20, 2009. http://link.aip.org/link/?PHF/21/112106/1&agg=rss Peter T. Nagy and G. Paul Neitzel<br/> A droplet may be prevented from molecular contact with a solid surface by providing a thin, lubricating film of surrounding fluid between the solid and liquid surfaces. In this study, we exploit thermocapillary convection, caused by a temperature difference maintained between the droplet and the unw ... [Phys. Fluids 21, 112106 (2009)] published Fri Nov 20, 2009. http://link.aip.org/link/?PHF/21/113302/1&agg=rss Masato Ida<br/> The inception of cavitation in multibubble cases is studied numerically and theoretically to show that it is different from that in single-bubble cases in several aspects. Using a multibubble model based on the RayleighPlesset equation with an acoustic interaction term, we confirmed that the recentl ... [Phys. Fluids 21, 113302 (2009)] published Thu Nov 19, 2009. http://link.aip.org/link/?PHF/21/112105/1&agg=rss Y. G. Chen and W. G. Price<br/> A numerical scheme of study is developed to model compressible two-fluid flows simulating liquid sloshing in a partially filled tank. For a two-fluid system separated by an interface as in the case of sloshing, not only a Mach-uniform scheme is required but also an effective way to eliminate unphysi ... [Phys. Fluids 21, 112105 (2009)] published Thu Nov 19, 2009. http://link.aip.org/link/?PHF/21/115105/1&agg=rss W. J. T. Bos, B. Kadoch, K. Schneider, and J.-P. Bertoglio<br/> Two-dimensional statistically stationary isotropic turbulence with an imposed uniform scalar gradient is investigated. Dimensional arguments are presented to predict the inertial range scaling of the turbulent scalar flux spectrum in both the inverse cascade range and the enstrophy cascade range for ... [Phys. Fluids 21, 115105 (2009)] published Wed Nov 18, 2009. http://link.aip.org/link/?PHF/21/114105/1&agg=rss N. A. Denissen and E. B. White<br/> Continuous spectrum amplitude distributions are calculated for transiently growing roughness-induced perturbations in a flat-plate boundary layer. A direct method is employed when the complete flow is known via direct numerical simulation. A new method using regularizing functionals is developed for ... [Phys. Fluids 21, 114105 (2009)] published Wed Nov 18, 2009. http://link.aip.org/link/?PHF/21/119101/1&agg=rss Yoshio Sone<br/> It is pointed out that the solution of a free molecular gas in a bounded domain proposed as speculation in Sec. II of Cai [Phys. Fluids 20, 017103 (2008)] and in Sec. II of Cai and Liu [Phys. Fluids 20, 067105 (2008)] and its result of the vanishing of flow velocity were rigorously derived under a m ... [Phys. Fluids 21, 119101 (2009)] published Wed Nov 18, 2009. http://link.aip.org/link/?PHF/21/115104/1&agg=rss Ronald L. Panton<br/> Data from direct numerical simulations have been correlated to examine the effects of Reynolds number on vorticity fluctuation profiles. Three different scalings are found: two in the inner region and the third in the outer region. In the inner region a two-term asymptotic expansion is required to r ... [Phys. Fluids 21, 115104 (2009)] published Tue Nov 17, 2009. http://link.aip.org/link/?PHF/21/114104/1&agg=rss C. C. Long, V. V. Krivets, J. A. Greenough, and J. W. Jacobs<br/> A vertical shock tube is used to perform experiments in which an interface is formed using opposed flows of air and SF. A three-dimensional single-mode perturbation is created by the periodic vertical motion of the gases within the shock tube. RichtmyerMeshkov instability is produced by an impulsive ... [Phys. Fluids 21, 114104 (2009)] published Mon Nov 16, 2009. http://link.aip.org/link/?PHF/21/111702/1&agg=rss L. Danaila and R. A. Antonia<br/> For moderate Reynolds numbers, the spectral scaling exponents of both velocity [E(k)[proportional]k] and the transported passive scalar [E(k)[proportional]k] fields exhibit departures from the asymptotic prediction m=m=5/3. However, at the same Reynolds number, the passive scalar spectrum for homoge ... [Phys. Fluids 21, 111702 (2009)] published Mon Nov 16, 2009. http://link.aip.org/link/?PHF/21/116101/1&agg=rss Margaret Pan and Re'em Sari<br/> The flow resulting from a strong ultrarelativistic shock moving through a stellar envelope with a polytropelike density profile has been studied analytically and numerically at early times while the fluid temperature is relativisticthat is, just before and after the shock breaks out of the star. Suc ... [Phys. Fluids 21, 116101 (2009)] published Fri Nov 13, 2009. http://link.aip.org/link/?PHF/21/112104/1&agg=rss Marco Arienti and Marios C. Soteriou<br/> New insight into the mechanism of liquid jet in crossflow atomization is provided by an analysis technique based on proper orthogonal decomposition and spectral analysis. Data are provided in the form of high-speed videos of the jet near field from experiments over a broad range of injection conditi ... [Phys. Fluids 21, 112104 (2009)] published Fri Nov 13, 2009. http://link.aip.org/link/?PHF/21/111701/1&agg=rss Yohann Duguet, Philipp Schlatter, and Dan S. Henningson<br/> The dynamics at the threshold of transition in plane Couette flow is investigated numerically in a large spatial domain for a certain type of localized initial perturbation, for Re between 350 and 1000. The corresponding edge state is an unsteady spotlike structure, localized in both streamwise and ... [Phys. Fluids 21, 111701 (2009)] published Fri Nov 13, 2009. http://link.aip.org/link/?PHF/21/115103/1&agg=rss W.-H. Cai, F.-C. Li, H.-N. Zhang, X.-B. Li, B. Yu et al.<br/> Turbulent drag reduction of 30 ppm cetyltrimethyl ammonium chloride (CTAC) solution flow in a channel was investigated with particle image velocimetry (PIV) combining with proper orthogonal decomposition (POD). Measurements were made at inlet fluid temperature of 304 K and at Reynolds number 2.5 x 1 ... [Phys. Fluids 21, 115103 (2009)] published Thu Nov 12, 2009. http://link.aip.org/link/?PHF/21/116602/1&agg=rss M. Duran-Matute, L. P. J. Kamp, R. R. Trieling, and G. J. F. van Heijst<br/> We study the axisymmetric inertial oscillations in a confined monopolar vortex under the influence of background rotation. By first focusing on the inviscid linear dynamics, and later studying the effects of viscosity and of a no-slip bottom, we characterize the effects of rotation and confinement. ... [Phys. Fluids 21, 116602 (2009)] published Wed Nov 11, 2009. http://link.aip.org/link/?PHF/21/112001/1&agg=rss Shigeru Takata<br/> A relation between the problem of thermophoresis of a sphere and that of a uniform flow past a sphere is discussed on the basis of the linearized Boltzmann equation. First pointed out is the disagreement between the relation predicted by the representation theorem recently developed by the author an ... [Phys. Fluids 21, 112001 (2009)] published Tue Nov 10, 2009. http://link.aip.org/link/?PHF/21/115102/1&agg=rss J. Znaien, Y. Hallez, F. Moisy, J. Magnaudet, J. P. Hulin et al.<br/> Buoyancy-driven turbulent mixing of fluids of slightly different densities [At=Deltarho/(2)=1.15 x 10] in a long circular tube tilted at an angle theta=15 degrees from the vertical is studied at the local scale, both experimentally from particle image velocimetry and laser induced fluorescence meas ... [Phys. Fluids 21, 115102 (2009)] published Mon Nov 9, 2009. http://link.aip.org/link/?PHF/21/115101/1&agg=rss Hachimi Fellouah and Andrew Pollard<br/> Stationary and flying single hot-wire measurements were made to investigate the near to intermediate field in a round free turbulent jet. Measurements were carried out at Reynolds numbers Re based on the jet exit mean velocity and the nozzle diameter, between 6000 and 100 000. The objective of this ... [Phys. Fluids 21, 115101 (2009)] published Mon Nov 9, 2009. http://link.aip.org/link/?PHF/21/116601/1&agg=rss Benjamin King, H. P. Zhang, and Harry L. Swinney<br/> Our laboratory experiments and numerical simulations of stratified tidal flow past model topography (a half sphere on a horizontal plane) reveal several three-dimensional flow features, including an unexpected flow perpendicular to the forcing plane (the vertical plane through the center of the sphe ... [Phys. Fluids 21, 116601 (2009)] published Mon Nov 9, 2009. http://link.aip.org/link/?PHF/21/112103/1&agg=rss Yuriy A. Semenov and Bum-Sang Yoon<br/> For the oblique impact of a wedge on a liquid half space, the limiting angles of the entry velocity and the wedge orientation corresponding to flow separation from the wedge vertex during the initial stage of the impact are investigated on the basis of an analytical solution of the problem. The liqu ... [Phys. Fluids 21, 112103 (2009)] published Mon Nov 9, 2009. http://link.aip.org/link/?PHF/21/114103/1&agg=rss M. Lombardini and D. I. Pullin<br/> We first study the linear stability of an interface between two fluids following the passage of an imploding or exploding shock wave. Assuming incompressible flow between the refracted waves following shock impact, we derive an expression for the asymptotic growth rate for a three-dimensional combin ... [Phys. Fluids 21, 114103 (2009)] published Fri Nov 6, 2009. http://link.aip.org/link/?PHF/21/114102/1&agg=rss E. Sanmiguel-Rojas, A. Sevilla, C. Martinez-Bazan, and J.-M. Chomaz<br/> The flow around a slender body with a blunt trailing edge is unstable in most situations of interest. Usually the flow instabilities are generated within the wake behind the bluff body, inducing fluctuating forces and introducing the possibility of resonance mechanisms with modes of the structure. B ... [Phys. Fluids 21, 114102 (2009)] published Fri Nov 6, 2009. http://link.aip.org/link/?PHF/21/113102/1&agg=rss J. D. Sherwood<br/> The container shape that minimizes the volume of draining fluid remaining on the walls of the container after it has been emptied from its base is determined. The film of draining fluid is assumed to wet the walls of the container, and is sufficiently thin so that its curvature may be neglected. Sur ... [Phys. Fluids 21, 113102 (2009)] published Wed Nov 4, 2009. http://link.aip.org/link/?PHF/21/113301/1&agg=rss S. W. Coleman and J. C. Vassilicos<br/> Our work focuses on the sweep-stick mechanism of particle clustering in turbulent flows introduced by Chen et al. [L. Chen, S. Goto, and J. C. Vassilicos, Turbulent clustering of stagnation points and inertial particles, J. Fluid Mech. 553, 143 (2006)] for two-dimensional (2D) inverse cascading homo ... [Phys. Fluids 21, 113301 (2009)] published Tue Nov 3, 2009. http://link.aip.org/link/?PHF/21/113101/1&agg=rss Anthony M. J. Davis and Eric Lauga<br/> When a liquid droplet is located above a super-hydrophobic surface, it only barely touches the solid portion of the surface, and therefore slides very easily on it. More generally, super-hydrophobic surfaces have been shown to lead to significant reduction in viscous friction in the laminar regime, ... [Phys. Fluids 21, 113101 (2009)] published Tue Nov 3, 2009. http://link.aip.org/link/?PHF/21/114101/1&agg=rss Arghya Samanta<br/> The stability of the viscous liquid film on an oscillating plane is investigated in the presence of both insoluble surfactant on the film surface and uniform electric field, acting normal to the plane. In this problem main motivation is to study the combine effect of surfactant and electric field on ... [Phys. Fluids 21, 114101 (2009)] published Tue Nov 3, 2009. http://link.aip.org/link/?PHF/21/112102/1&agg=rss A. I. Mizev and D. Schwabe<br/> We present the results of an experimental study of convective instabilities in a horizontal liquid layer with free upper surface under the action of an inclined temperature gradient, i.e., when horizontal and vertical temperature gradients are applied at the same time. Silicone oil of 10 cSt (Prandt ... [Phys. Fluids 21, 112102 (2009)] published Tue Nov 3, 2009. http://link.aip.org/link/?PHF/21/117101/1&agg=rss C. Marugan-Cruz, J. Rodriguez-Rodriguez, and C. Martinez-Bazan<br/> The initial development of negatively buoyant jets has been investigated experimentally and numerically, focusing on the role played by gravity in the evolution of the leading vortex ring. Under the experimental conditions considered in this work, the densimetric Froude number, Fr=rhoU/[(rhorho)gD], ... [Phys. Fluids 21, 117101 (2009)] published Mon Nov 2, 2009. http://link.aip.org/link/?PHF/21/112101/1&agg=rss S. T. Thoroddsen, K. Takehara, T. G. Etoh, and C.-D. Ohl<br/> We use high-speed video imaging to study laser disruption of the free surface of a hemispheric drop. The drop sits on a glass surface and the Nd:YAG (yttrium aluminum garnet) laser pulse propagates through the drop and is focused near the free surface from below. We focus on the evolution of the cyl ... [Phys. Fluids 21, 112101 (2009)] published Mon Nov 2, 2009. http://link.aip.org/link/?PHF/21/103604/1&agg=rss B. Semin, J. P. Hulin, and H. Auradou<br/> The influence of confinement on the drag force F on a static cylinder in a viscous flow inside a rectangular slit of aperture h has been investigated from experimental measurements and numerical simulations. At low enough Reynolds numbers, F varies linearly with the mean velocity and the viscosity, ... [Phys. Fluids 21, 103604 (2009)] published Fri Oct 30, 2009. http://link.aip.org/link/?PHF/21/102103/1&agg=rss Shawn W. Walker, Benjamin Shapiro, and Ricardo H. Nochetto<br/> This work describes the modeling and simulation of planar electrowetting on dielectric devices that move fluid droplets by modulating surface tension effects. The fluid dynamics are modeled by Hele-Shaw type equations with a focus on including the relevant boundary phenomena. Specifically, we includ ... [Phys. Fluids 21, 102103 (2009)] published Fri Oct 30, 2009. http://link.aip.org/link/?PHF/21/102004/1&agg=rss I. A. Graur, P. Perrier, W. Ghozlani, and J. G. Meolans<br/> Mass flow rate measurements in a single silicon microchannel were carried out for various gases in isothermal steady flows. The results obtained from hydrodynamic to near free molecular regime by using a powerful experimental platform allowed us to deduce interesting information, notably about the r ... [Phys. Fluids 21, 102004 (2009)] published Fri Oct 30, 2009. http://link.aip.org/link/?PHF/21/101705/1&agg=rss Paris G. Perdikaris, Lambros Kaiktsis, and George S. Triantafyllou<br/> In this letter we show that a cylinder oscillating harmonically in line with an incoming flow at a frequency equal to the natural frequency of vortex shedding induces for certain amplitudes of oscillation a chaotic state in the flow, characterized by an aperiodic lift force. The result is obtained t ... [Phys. Fluids 21, 101705 (2009)] published Thu Oct 29, 2009. http://link.aip.org/link/?PHF/21/106604/1&agg=rss M. Stastna, F. J. Poulin, K. L. Rowe, and C. Subich<br/> The ubiquity of solitary and solitarylike internal waves in the coastal ocean has been recognized for some time. Recent theoretical studies of a strongly nonlinear, weakly nonhydrostatic set of layer-averaged model equations have predicted that rotation, for example, on the f-plane, can lead to the ... [Phys. Fluids 21, 106604 (2009)] published Thu Oct 29, 2009. http://link.aip.org/link/?PHF/21/101704/1&agg=rss Lai-Bing Jia and Xie-Zhen Yin<br/> Flow induced vibrations are observed in many engineering applications. A flexible body located in the wake of an obstacle is usually forced to vibrate by the periodic vortices shedding from the obstacle. Here we focus on the response of the flexible body in the wake. Soap film tunnels are used to pr ... [Phys. Fluids 21, 101704 (2009)] published Thu Oct 29, 2009. http://link.aip.org/link/?PHF/21/105105/1&agg=rss Yulia Peet and Pierre Sagaut<br/> This article can be considered as an extension of the paper of Fukagata et al. [Phys. Fluids 14, L73 (2002)] which derived an analytical expression for the constituent contributions to skin friction in a turbulent channel, pipe, and plane boundary layer flows. In this paper, we extend the theoretica ... [Phys. Fluids 21, 105105 (2009)] published Wed Oct 28, 2009. http://link.aip.org/link/?PHF/21/109901/1&agg=rss Philippe R. Spalart, Gary N. Coleman, and Roderick Johnstone<br/> Abstract not available. [Phys. Fluids 21, 109901 (2009)] published Wed Oct 28, 2009. http://link.aip.org/link/?PHF/21/103603/1&agg=rss Joseph Majdalani and Martin J. Chiaverini<br/> This study is focused on the tangential boundary layers of a bidirectional vortex, specifically those forming at the core and the sidewall of a swirl-driven cyclonic chamber. Our analysis is based on the regularized, tangential momentum equation which is rescaled in a manner to capture the forced vo ... [Phys. Fluids 21, 103603 (2009)] published Wed Oct 28, 2009. http://link.aip.org/link/?PHF/21/106105/1&agg=rss Thomas Emmert, Philippe Lafon, and Christophe Bailly<br/> A sonic flow in a plane duct passing an abrupt increase in cross section is studied using compressible large-eddy simulations. Different flow patterns are likely to appear in this configuration according to the ratio between the downstream ambient pressure and the upstream reservoir pressure. For lo ... [Phys. Fluids 21, 106105 (2009)] published Wed Oct 28, 2009. http://link.aip.org/link/?PHF/21/103103/1&agg=rss A. Vikhansky<br/> We consider the effect of yield stress on the RayleighBenard convection of a viscoplastic material. First we consider the model problem of convection in a differentially heated loop, which is described by the (modified) Lorenz equations. The presence of the yield stress significantly alters the dyna ... [Phys. Fluids 21, 103103 (2009)] published Wed Oct 28, 2009. http://link.aip.org/link/?PHF/21/103304/1&agg=rss Olivier Pitois, Christelle Fritz, Laurentiu Pasol, and Michele Vignes-Adler<br/> We studied both experimentally and numerically the sedimentation velocity of small solid particles through liquid channels merging at the intersection of three soap films. The wall mobility induces a nontrivial behavior for the particle drag coefficient, providing particular transport properties tha ... [Phys. Fluids 21, 103304 (2009)] published Mon Oct 26, 2009. http://link.aip.org/link/?PHF/21/103303/1&agg=rss Rajesh Kumar Singh and Kausik Sarkar<br/> Drops driven toward each other by shear at finite inertia follow two distinct types of trajectories. Type I trajectory is similar to the one in Stokes flow where drops slide past each other. However, at finite inertia, drops display a new type II trajectory, where they reverse their paths. Increasin ... [Phys. Fluids 21, 103303 (2009)] published Mon Oct 26, 2009. http://link.aip.org/link/?PHF/21/102102/1&agg=rss Peng Gao and James J. Feng<br/> We perform numerical simulations of a shear flow over a periodically patterned substrate with entrapped gas bubbles. A diffuse-interface model is employed to handle the liquid-gas interface deformation and the three-phase contact line. Depending on the shear rate and the pattern geometry, four flow ... [Phys. Fluids 21, 102102 (2009)] published Mon Oct 26, 2009.