Latest papers in fluid mechanics
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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