Latest papers in fluid mechanics

Bubble stabilization by the star-nosed mole

Physical Review Fluids - Thu, 12/06/2018 - 10:00

Author(s): Alexander B. Lee and David L. Hu

The star-nosed mole sniffs for prey underwater by rapidly blowing a bubble, then sucking it back in before the bubble detaches from the nose. Experiments show how the bizarre shape of the mole’s nose might contribute to stabilizing bubbles during the sniff, enabling this behavior.

[Phys. Rev. Fluids 3, 123101] Published Thu Dec 06, 2018

Local velocity variations for a drop moving through an orifice: Effects of edge geometry and surface wettability

Physical Review Fluids - Thu, 12/06/2018 - 10:00

Author(s): Ankur D. Bordoloi and Ellen K. Longmire

Velocity fields determined within and surrounding a drop moving through an orifice reveal the relative importance of local deformation, fluid rotation, and dissipation in the surrounding fluid as well as the coupling between fluid inertia and contact-line motion.

[Phys. Rev. Fluids 3, 123602] Published Thu Dec 06, 2018

Particle entrainment in unsteady-uniform granular avalanches

Physical Review Fluids - Thu, 12/06/2018 - 10:00

Author(s): Michele Larcher, Anna Prati, and Luigi Fraccarollo

Experiments on unsteady granular avalanches, which are uniform in the flow direction, allow for observations of the evolution of the flow depth, the velocity profile, and the concentration distribution. A simple, physically-based, analytic model is proposed to fit the observations.

[Phys. Rev. Fluids 3, 124302] Published Thu Dec 06, 2018

Hyperuniform flow fields resulting from hyperuniform configurations of circular disks

Physical Review E - Wed, 12/05/2018 - 10:00

Author(s): Zhenya Ding, Yu Zheng, Yaopengxiao Xu, Yang Jiao, and Wei Li

Motivated by cancer cell capture and sorting applications, we investigate the scalar velocity field of two-dimensional (2D) laminar flows through configurations of fixed congruent circular disks with a disordered hyperuniform (HU) distribution of the disk centers. Disordered HU many-particle systems...

[Phys. Rev. E 98, 063101] Published Wed Dec 05, 2018

Two-sphere swimmers in viscoelastic fluids

Physical Review Fluids - Wed, 12/05/2018 - 10:00

Author(s): Charu Datt, Babak Nasouri, and Gwynn J. Elfring

Swimmers comprised of two rigid spheres that oscillate periodically along their axis of symmetry are examined. In viscoelastic fluids, the swimmers propel in the direction of the smaller sphere when the two spheres are of different sizes.

[Phys. Rev. Fluids 3, 123301] Published Wed Dec 05, 2018

Lateral vesicle migration in a bounded shear flow: Viscosity contrast leads to off-centered solutions

Physical Review Fluids - Wed, 12/05/2018 - 10:00

Author(s): Abdessamad Nait-Ouhra, Achim Guckenberger, Alexander Farutin, Hamid Ez-Zahraouy, Abdelilah Benyoussef, Stephan Gekle, and Chaouqi Misbah

The lateral migration of a vesicle (a model of red blood cells) in a bounded shear flow is investigated numerically. It is found that there exists an off-center stable steady state of the vesicle in addition to the usual centerline, depending on the initial position and viscosity contrast.

[Phys. Rev. Fluids 3, 123601] Published Wed Dec 05, 2018

Drag upon a sphere suspended in a low magnetic-Reynolds number MHD channel flow

Physical Review Fluids - Wed, 12/05/2018 - 10:00

Author(s): Jules Delacroix and Laurent Davoust

As a first step towards the description of magnetohydrodynamic (MHD) dispersed two-phase flows, a permanent MHD channel flow past a stationary sphere is numerically investigated, highlighting the gradual emergence of atypical MHD flow patterns, among them a genuine “ghost column.”

[Phys. Rev. Fluids 3, 123701] Published Wed Dec 05, 2018

Effect of layout on asymptotic boundary layer regime in deep wind farms

Physical Review Fluids - Wed, 12/05/2018 - 10:00

Author(s): Juliaan Bossuyt, Charles Meneveau, and Johan Meyers

This paper presents wind tunnel data for 56 different layouts of a scaled wind farm with 100 porous disk models. The data indicates that a nonuniform streamwise spacing between turbine rows can increase power output in the fully developed and entrance regions of large wind farms.

[Phys. Rev. Fluids 3, 124603] Published Wed Dec 05, 2018

Rectification of chaotic fluid motion in two-dimensional turbulence

Physical Review Fluids - Tue, 12/04/2018 - 10:00

Author(s): N. Francois, H. Xia, H. Punzmann, and M. Shats

In two-dimensional turbulence, we show how to create devices able to feed on the turbulent fluid motion by coupling with underlying features of the energy cascade. By changing the shape of the device, we can turn it into a self-propelled vehicle or a rotor powered by turbulence.

[Phys. Rev. Fluids 3, 124602] Published Tue Dec 04, 2018

Modeling internal rogue waves in a long wave-short wave resonance framework

Physical Review Fluids - Tue, 12/04/2018 - 10:00

Author(s): H. N. Chan, R. H. J. Grimshaw, and K. W. Chow

Rogue waves in the interior of a stratified fluid are modeled as special breathers (pulsating modes) arising from long-wave–short-wave resonance. Features like the existence condition and waveforms contrast sharply with those of free surface waves governed by the nonlinear Schrödinger equation.

[Phys. Rev. Fluids 3, 124801] Published Tue Dec 04, 2018

Sedimentation of a rigid helix in viscous media

Physical Review Fluids - Mon, 12/03/2018 - 10:00

Author(s): Martina Palusa, Joost de Graaf, Aidan Brown, and Alexander Morozov

A theoretical study of rigid helices sedimenting under gravity finds they either follow a helical path downwards, or exhibit complicated oscillations close to the horizontal orientation.

[Phys. Rev. Fluids 3, 124301] Published Mon Dec 03, 2018

Energy transport due to pressure diffusion enhanced by helicity and system rotation in inhomogeneous turbulence

Physical Review Fluids - Mon, 12/03/2018 - 10:00

Author(s): Kazuhiro Inagaki and Fujihiro Hamba

It is known that turbulent energy is rapidly transferred in the direction of the rotation axis in a rotating system, in comparison with the nonrotating case. A new turbulence model of the energy flux predicting this phenomenon is proposed and discussed in terms of turbulent helicity.

[Phys. Rev. Fluids 3, 124601] Published Mon Dec 03, 2018

Universal scaling law in frictional non-Brownian suspensions

Physical Review Fluids - Fri, 11/30/2018 - 10:00

Author(s): Frédéric Blanc, Enzo D'Ambrosio, Laurent Lobry, François Peters, and Elisabeth Lemaire

Suspensions made of either faceted or spherical particles behave in quite different ways. However, experiments show that it is possible to unify their behavior by considering the contact contribution to the viscosity that is evaluated through shear reversal experiments.

[Phys. Rev. Fluids 3, 114303] Published Fri Nov 30, 2018

Mass entrainment-based model for separating flows

Physical Review Fluids - Fri, 11/30/2018 - 10:00

Author(s): F. Stella, N. Mazellier, P. Joseph, and A. Kourta

The recirculation flow bounding a forced separating and reattaching shear layer is modeled. Experimental results emphasize that mass entrainment is a key parameter on which the parameters of the model scale. It is shown that an inexpensive and easily deployable sensor can be used to estimate the backflow.

[Phys. Rev. Fluids 3, 114702] Published Fri Nov 30, 2018

Versatile reduced-order model of leading-edge vortices on rotary wings

Physical Review Fluids - Fri, 11/30/2018 - 10:00

Author(s): D. Chen, D. Kolomenskiy, R. Onishi, and H. Liu

An analytical model is proposed for the strength and position of the Leading Edge Vortex on a revolving wing at an arbitrary angle of attack. Predictions are compared with experiments and numerical solutions.

[Phys. Rev. Fluids 3, 114703] Published Fri Nov 30, 2018

Multiple states and heat transfer in two-dimensional tilted convection with large aspect ratios

Physical Review Fluids - Thu, 11/29/2018 - 10:00

Author(s): Qi Wang, Zhen-Hua Wan, Rui Yan, and De-Jun Sun

Multiple stable states exist for two-dimensional tilted convection with large aspect ratios (Γ≥2). The Nusselt number generally decreases monotonically with increasing tilt angle for large Γ cases with Γ≥8.

[Phys. Rev. Fluids 3, 113503] Published Thu Nov 29, 2018

Conditionally averaged flow topology about a critical point pair in the skin friction field of pipe flows using direct numerical simulations

Physical Review Fluids - Wed, 11/28/2018 - 10:00

Author(s): R. C. Chin, J. P. Monty, M. S. Chong, and I. Marusic

The flow topology in the vicinity of critical points in a pipe flow reveals turbulence motions resembling hairpin-like vortical structures. Three-dimensional U separation is found to be closely associated with critical points that could form a simple model for wall turbulence.

[Phys. Rev. Fluids 3, 114607] Published Wed Nov 28, 2018

Impact of clogging on the transfer dynamics of hydraulic networks

Physical Review E - Tue, 11/27/2018 - 10:00

Author(s): D. S. Griffani, P. Rognon, and I. Einav

We investigate how clogging affects the transfer properties of a generic class of materials featuring a hydraulic network embedded in a matrix. We consider the flow of a liquid through fully saturated hydraulic networks which transfer heat (or mass) by advection and diffusion, and a matrix in which ...

[Phys. Rev. E 98, 053107] Published Tue Nov 27, 2018

Phenomenology of bubble-collapse-driven penetration of biomaterial-surrogate liquid-liquid interfaces

Physical Review Fluids - Tue, 11/27/2018 - 10:00

Author(s): Shucheng Pan, Stefan Adami, Xiangyu Hu, and Nikolaus A. Adams

Bubble-collapse-driven penetration of liquid-liquid interfaces exhibits two scaling ranges of penetration depth vs time. Detailed numerical simulations show that size and evolution of generated interface perforations depend on viscosity, shock strength, and single- or multiple-bubble configurations.

[Phys. Rev. Fluids 3, 114005] Published Tue Nov 27, 2018

Negative acoustic radiation force induced on an elastic sphere by laser irradiation

Physical Review E - Mon, 11/26/2018 - 10:00

Author(s): Hai-Qun Yu, Jie Yao, Da-Jian Wu, Xue-Wei Wu, and Xiao-Jun Liu

We propose an alternative strategy to modulate the acoustic radiation force (ARF) acting on an elastic sphere (ES) using laser irradiation. A mathematical model of the interaction of the acoustic plane wave with the laser-irradiated ES is developed to calculate the ARF acting on the ES. It is demons...

[Phys. Rev. E 98, 053105] Published Mon Nov 26, 2018


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