http://scitation.aip.org/ Physics of Fluids: All Topics 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. http://link.aip.org/link/?PHF/21/105104/1&agg=rss Robert D. Moser, Nicholas P. Malaya, Henry Chang, Paulo S. Zandonade, Prakash Vedula et al.<br/> Large eddy simulation (LES), in which the large scales of turbulence are simulated while the effects of the small scales are modeled, is an attractive approach for predicting the behavior of turbulent flows. However, there are a number of modeling and formulation challenges that need to be addressed ... [Phys. Fluids 21, 105104 (2009)] published Fri Oct 23, 2009. http://link.aip.org/link/?PHF/21/105103/1&agg=rss Hiroshi Yokoyama and Chisachi Kato<br/> The fluid-acoustic interactions in a flow over a two-dimensional rectangular cavity are investigated by directly solving the compressible NavierStokes equations. The upstream boundary layer is turbulent. The depth-to-length ratio of the cavity is 0.5. Phase-averaged flow fields reveal the mechanism ... [Phys. Fluids 21, 105103 (2009)] published Fri Oct 23, 2009. http://link.aip.org/link/?PHF/21/106603/1&agg=rss Ryan S. R. Sidin, Rutger H. A. IJzermans, and Michael W. Reeks<br/> The condensation of microdroplets in model systems, reminiscent of atmospheric clouds, is investigated numerically and analytically. Droplets have been followed through a synthetic turbulent flow field composed of 200 random Fourier modes, with wave numbers ranging from the integral scales [[script ... [Phys. Fluids 21, 106603 (2009)] published Fri Oct 23, 2009. http://link.aip.org/link/?PHF/21/103602/1&agg=rss G. P. Wang, X. S. Xu, and Y. X. Zhang<br/> This paper presents a new semianalytical method, Hamiltonian systematic method, for solving axisymmetric problems of Stokes flow. In the system, nonzero-eigenvalue solutions can describe local effect near the boundary and therefore the influence of inlet radius on the flow can be investigated. A rul ... [Phys. Fluids 21, 103602 (2009)] published Fri Oct 23, 2009. http://link.aip.org/link/?PHF/21/103302/1&agg=rss Xing Zhang, Saizhen Ni, Shizhao Wang, and Guowei He<br/> The hydrodynamics of a free flapping foil is studied numerically. The foil undergoes a forced vertical oscillation and is free to move horizontally. The effect of chord-thickness ratio is investigated by varying this parameter while fixing other ones such as the Reynolds number, the density ratio, a ... [Phys. Fluids 21, 103302 (2009)] published Thu Oct 22, 2009. http://link.aip.org/link/?PHF/21/103301/1&agg=rss Cheng Chen and Dongxiao Zhang<br/> We used a coupled multiphase lattice Boltzmann (LB) model to simulate the dissolution of immiscible liquid droplets in another liquid during the rising process resulting from buoyancy. It was found that there existed a terminal rise velocity for each droplet, and there was a power law relationship b ... [Phys. Fluids 21, 103301 (2009)] published Thu Oct 22, 2009. http://link.aip.org/link/?PHF/21/103102/1&agg=rss Nilesh H. Parmar, Mahesh S. Tirumkudulu, and E. J. Hinch<br/> We study a Newtonian viscous liquid coating a vertical rotating disk in the creeping flow regime. Experiments were performed at varying disk rotation speeds and liquid volumes, and the thickness profile at steady state was measured. While the maximum liquid supported by the rotating disk varied with ... [Phys. Fluids 21, 103102 (2009)] published Thu Oct 22, 2009. http://link.aip.org/link/?PHF/21/106104/1&agg=rss M. Turkyilmazoglu<br/> The motivation of the present study is to obtain exact analytical solution of the steady laminar flow of a compressible viscous fluid over a rotating disk subjected to a uniformly applied suction or blowing. Classical Von Karman problem of a rotating disk is extended to account for the compressibili ... [Phys. Fluids 21, 106104 (2009)] published Wed Oct 21, 2009. http://link.aip.org/link/?PHF/21/102003/1&agg=rss Bram M. Borkent, Stephan Gekle, Andrea Prosperetti, and Detlef Lohse<br/> The acoustic nucleation threshold for bubbles trapped in cavities has theoretically been predicted within the crevice theory by Atchley and Prosperetti [The crevice model of bubble nucleation, J. Acoust. Soc. Am. 86, 1065 (1989)]. Here, we determine this threshold experimentally, by applying a singl ... [Phys. Fluids 21, 102003 (2009)] published Mon Oct 19, 2009. http://link.aip.org/link/?PHF/21/106103/1&agg=rss J. D. Parisse, L. Leger, E. Depussay, V. Lago, and Y. Burtschell<br/> This study is devoted to numerical and experimental investigations about the influence of an electrical discharge over a flat plate immersed in a rarefied Mach 2 airflow. Regarding the experimental work, a negative dc discharge is created by applying a potential difference gap between two spanwise a ... [Phys. Fluids 21, 106103 (2009)] published Fri Oct 16, 2009. http://link.aip.org/link/?PHF/21/104103/1&agg=rss Li Lin and Sharon O. Stephen<br/> This investigation is concerned with the linear development of Gortler vortices in the high-Reynolds-number laminar compressible wake behind a flat plate which is aligned with the centerline of a curved mixing-layer system. The Gortler modes were previously found to exist within curved compressible ... [Phys. Fluids 21, 104103 (2009)] published Fri Oct 16, 2009. http://link.aip.org/link/?PHF/21/105102/1&agg=rss L. Bricteux, M. Duponcheel, and G. Winckelmans<br/> A new subgrid-scale (SGS) model which has an adequate behavior in both vortical flows and wall-bounded flows is proposed. In wall-bounded flows with wall-resolved large eddy simulation (LES), the theory predicts that the SGS dissipation should vanish as y near the wall. In free vortex flows, one nee ... [Phys. Fluids 21, 105102 (2009)] published Thu Oct 15, 2009. http://link.aip.org/link/?PHF/21/103601/1&agg=rss Denize Kalempa and Felix Sharipov<br/> A sound propagation through a rarefied gas is investigated on the basis of the linearized kinetic equation taking into account the influence of receptor. A plate oscillating in the normal direction to its own plane is considered as a sound source, while a stationary parallel plate is considered as b ... [Phys. Fluids 21, 103601 (2009)] published Tue Oct 13, 2009. http://link.aip.org/link/?PHF/21/101901/1&agg=rss Jiwoong Choi, Merryn H. Tawhai, Eric A. Hoffman, and Ching-Long Lin<br/> The effects of intra- and intersubject variabilities in airway geometry on airflow in the human lungs are investigated by large eddy simulation. The airway models of two human subjects consisting of extra- and intrathoracic airways are reconstructed from CT images. For intrasubject study, airflows a ... [Phys. Fluids 21, 101901 (2009)] published Tue Oct 13, 2009. http://link.aip.org/link/?PHF/21/106102/1&agg=rss Yonatan Oren and Re'em Sari<br/> A solution to the ultrarelativistic strong explosion problem with a nonpower law density gradient is delineated. We consider a blast wave expanding into a density profile falling off as a steep radial power law with small, spherically symmetric, and log-periodic density perturbations. We find discre ... [Phys. Fluids 21, 106102 (2009)] published Mon Oct 12, 2009. http://link.aip.org/link/?PHF/21/103101/1&agg=rss Colman P. Carroll and Yong Lak Joo<br/> In this paper the axisymmetric instabilities observed during the electrospinning of highly electrically conducting, viscoelastic poly(ethylene oxide) (PEO)/water solutions are investigated. In our theoretical study, a linear stability analysis is coupled with a model for the stable electrospun jet. ... [Phys. Fluids 21, 103101 (2009)] published Mon Oct 12, 2009. http://link.aip.org/link/?PHF/21/106602/1&agg=rss Paul Billant and Stephane Le Dizes<br/> This paper investigates the discrete bounded waves sustained by a vertical columnar Rankine vortex in a strongly stratified fluid. We show that these waves are very different from their well-known counterpart in homogeneous fluid (Kelvin vortex waves); they exist only for nonzero azimuthal wavenumbe ... [Phys. Fluids 21, 106602 (2009)] published Mon Oct 12, 2009. http://link.aip.org/link/?PHF/21/101703/1&agg=rss Y. Charles Li and Divakar Viswanath<br/> We derive necessary conditions that traveling wave and other solutions of the NavierStokes equations must satisfy in the pipe, Couette, and channel flow geometries. Some conditions are exact and must hold for any traveling wave solution or periodic solution irrespective of the Reynolds number (Re). ... [Phys. Fluids 21, 101703 (2009)] published Mon Oct 12, 2009. http://link.aip.org/link/?PHF/21/106601/1&agg=rss Riwal Plougonven and Vladimir Zeitlin<br/> Inertial instability is investigated numerically in a two-dimensional setting in order to understand its nonlinear stage and saturation. To focus on fundamental mechanisms, a simple barotropic shear U(y)=tanh y on the f-plane is considered. The linear stability problem is first solved analytically, ... [Phys. Fluids 21, 106601 (2009)] published Fri Oct 9, 2009. http://link.aip.org/link/?PHF/21/101702/1&agg=rss A. de Lozar, A. Heap, F. Box, A. L. Hazel, and A. Juel<br/> Microscale process engineering requires precise control of bubbles and droplets. We investigate geometry-induced control and find that a centered constriction in the cross section of rectangular tubes can lead to new families of steadily propagating bubbles, which localize in the least-constricted r ... [Phys. Fluids 21, 101702 (2009)] published Fri Oct 9, 2009.