Physical Review E

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Recently published articles in Phys. Rev. E in the Table of Content section "Fluid dynamics"
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Effects of axial boundary conductivity on a free Stewartson-Shercliff layer

Wed, 06/20/2018 - 11:00

Author(s): Kyle J. Caspary, Dahan Choi, Fatima Ebrahimi, Erik P. Gilson, Jeremy Goodman, and Hantao Ji

The effects of axial boundary conductivity on the formation and stability of a magnetized free Stewartson-Shercliff layer (SSL) in a short Taylor-Couette device are reported. As the axial field increases with insulating endcaps, hydrodynamic Kelvin-Helmholtz-type instabilities set in at the SSLs of ...

[Phys. Rev. E 97, 063110] Published Wed Jun 20, 2018

Unified decomposition method to study Rayleigh-Taylor instability in liquids and solids

Tue, 06/19/2018 - 11:00

Author(s): Y. B. Sun, J. J. Tao, and X. T. He

In the previous studies of Rayleigh-Taylor instability, different methods were used to consider the effects of elasticity, viscosity, and magnetic fields. In this paper, a unified method, which was first used for fluids, is validated for different physical models, where the unstable mode is decompos...

[Phys. Rev. E 97, 063109] Published Tue Jun 19, 2018

Directional change of tracer trajectories in rotating Rayleigh-Bénard convection

Mon, 06/18/2018 - 11:00

Author(s): Kim M. J. Alards, Hadi Rajaei, Rudie P. J. Kunnen, Federico Toschi, and Herman J. H. Clercx

The angle of directional change of tracer trajectories in rotating Rayleigh-Bénard convection is studied as a function of the time increment τ between two instants of time along the trajectories, both experimentally and with direct numerical simulations. Our aim is to explore the geometrical charact...

[Phys. Rev. E 97, 063105] Published Mon Jun 18, 2018

Cross-stream migration of drops suspended in Poiseuille flow in the presence of an electric field

Mon, 06/18/2018 - 11:00

Author(s): Binita Nath, Gautam Biswas, Amaresh Dalal, and Kirti Chandra Sahu

The present study focuses on the cross-stream migration of a neutrally buoyant two-dimensional drop in a Poiseuille flow in a channel under the influence of an electric field. In the absence of an electric field, the important nondimensional parameters describing this problem are the viscosity ratio...

[Phys. Rev. E 97, 063106] Published Mon Jun 18, 2018

Networked-oscillator-based modeling and control of unsteady wake flows

Mon, 06/18/2018 - 11:00

Author(s): Aditya G. Nair, Steven L. Brunton, and Kunihiko Taira

A networked-oscillator-based analysis is performed to examine and control the transfer of kinetic energy for periodic bluff body flows. The dynamics of energy fluctuations in the flow field are described by a set of oscillators defined by conjugate pairs of spatial proper orthogonal decomposition (P...

[Phys. Rev. E 97, 063107] Published Mon Jun 18, 2018

Magnetic energy transient growth in the subcritical Kazantsev model

Mon, 06/18/2018 - 11:00

Author(s): Egor Yushkov, Alexander Lukin, and Dmitry Sokoloff

We study average magnetic field growth in a mirror-symmetrical Kazantsev turbulent flow near the dissipative scales. Our main attention is directed to a subcritical regime, when an exponential decrease of magnetic energy is usually expected. We show that instead of damping, transient energy growth c...

[Phys. Rev. E 97, 063108] Published Mon Jun 18, 2018

Wetting dynamics in two-liquid systems: Effect of the surrounding phase viscosity

Wed, 06/13/2018 - 11:00

Author(s): P. Bazazi, A. Sanati-Nezhad, and S. H. Hejazi

This paper reports the experimental results of a water droplet spreading on a glass substrate submerged in an oil phase. The radius of the wetted area grows exponentially over time forming two distinct regimes. The early time dynamics of wetting is characterized with the time exponent of 1, referred...

[Phys. Rev. E 97, 063104] Published Wed Jun 13, 2018

Network community-based model reduction for vortical flows

Mon, 06/11/2018 - 11:00

Author(s): Muralikrishnan Gopalakrishnan Meena, Aditya G. Nair, and Kunihiko Taira

A network community-based reduced-order model is developed to capture key interactions among coherent structures in high-dimensional unsteady vortical flows. The present approach is data-inspired and founded on network-theoretic techniques to identify important vortical communities that are comprise...

[Phys. Rev. E 97, 063103] Published Mon Jun 11, 2018

Manipulation of viscous fingering in a radially tapered cell geometry

Fri, 06/08/2018 - 11:00

Author(s): Grégoire Bongrand and Peichun Amy Tsai

When a more mobile fluid displaces another immiscible one in a porous medium, viscous fingering propagates with a partial sweep, which hinders oil recovery and soil remedy. We experimentally investigate the feasibility of tuning such fingering propagation in a nonuniform narrow passage with a radial...

[Phys. Rev. E 97, 061101(R)] Published Fri Jun 08, 2018

Internal waves in sheared flows: Lower bound of the vorticity growth and propagation discontinuities in the parameter space

Fri, 06/08/2018 - 11:00

Author(s): Federico Fraternale, Loris Domenicale, Gigliola Staffilani, and Daniela Tordella

This study provides sufficient conditions for the temporal monotonic decay of enstrophy for two-dimensional perturbations traveling in the incompressible, viscous, plane Poiseuille, and Couette flows. Extension of Synge's procedure [J. L. Synge, Proc. Fifth Int. Congress Appl. Mech. 2, 326 (1938); S...

[Phys. Rev. E 97, 063102] Published Fri Jun 08, 2018

Contact line friction of electrowetting actuated viscous droplets

Fri, 06/01/2018 - 11:00

Author(s): Quoc Vo and Tuan Tran

Droplets on a surface immersed in oil are made to spread and retract by switching on and off a potential difference between the droplets and the surface. The authors find that the contact line friction depends on the viscosities of the droplet and the surrounding oil and that it does not depend significantly on the driving force or the direction of motion.

[Phys. Rev. E 97, 063101] Published Fri Jun 01, 2018

Permeability of solid foam: Effect of pore connections

Thu, 05/31/2018 - 11:00

Author(s): V. Langlois, V. H. Trinh, C. Lusso, C. Perrot, X. Chateau, Y. Khidas, and O. Pitois

In this paper, we study how the permeability of solid foam is modified by the presence of membranes that close partially or totally the cell windows connecting neighboring pores. The finite element method (FEM) simulations computing the Stokes problem are performed at both pore and macroscopic scale...

[Phys. Rev. E 97, 053111] Published Thu May 31, 2018

Single-bubble and multibubble cavitation in water triggered by laser-driven focusing shock waves

Thu, 05/31/2018 - 11:00

Author(s): D. Veysset, U. Gutiérrez-Hernández, L. Dresselhaus-Cooper, F. De Colle, S. Kooi, K. A. Nelson, P. A. Quinto-Su, and T. Pezeril

In this study a single laser pulse spatially shaped into a ring is focused into a thin water layer, creating an annular cavitation bubble and cylindrical shock waves: an outer shock that diverges away from the excitation laser ring and an inner shock that focuses towards the center. A few nanosecond...

[Phys. Rev. E 97, 053112] Published Thu May 31, 2018

Fractality and the law of the wall

Tue, 05/29/2018 - 11:00

Author(s): Haosen H. A. Xu and X. I. A. Yang

Fluid motions in the inertial range of isotropic turbulence are fractal, with their space-filling capacity slightly below regular three-dimensional objects, which is a consequence of the energy cascade. Besides the energy cascade, the other often encountered cascading process is the momentum cascade...

[Phys. Rev. E 97, 053110] Published Tue May 29, 2018

Combined effects of molecular geometry and nanoconfinement on liquid flows through carbon nanotubes

Fri, 05/25/2018 - 11:00

Author(s): Kazuhiko Suga, Yuki Mori, Rintaro Moritani, and Masayuki Kaneda

Molecular dynamics simulations are carried out to investigate the geometry effects of diatomic molecules on liquid flows in carbon nanotubes (CNTs). Oxygen molecules are considered as the fluid inside armchair (n,n) (n=6–20) CNTs. The simulated fluid temperature and bulk pressure for the liquid stat...

[Phys. Rev. E 97, 053109] Published Fri May 25, 2018

Size distribution spectrum of noninertial particles in turbulence

Thu, 05/24/2018 - 11:00

Author(s): Izumi Saito, Toshiyuki Gotoh, and Takeshi Watanabe

Collision-coalescence growth of noninertial particles in three-dimensional homogeneous isotropic turbulence is studied. Smoluchowski's coagulation equation describes the evolution of the size distribution of particles in this system. By applying a methodology based on turbulence theory, the equation...

[Phys. Rev. E 97, 053108] Published Thu May 24, 2018

Three-dimensional instabilities of natural convection between two differentially heated vertical plates: Linear and nonlinear complementary approaches

Tue, 05/22/2018 - 11:00

Author(s): Zhenlan Gao, Berengere Podvin, Anne Sergent, Shihe Xin, and Jalel Chergui

The transition to the chaos of the air flow between two vertical plates maintained at different temperatures is studied in the Boussinesq approximation. After the first bifurcation at critical Rayleigh number Rac, the flow consists of two-dimensional (2D) corotating rolls. The stability of the 2D ro...

[Phys. Rev. E 97, 053107] Published Tue May 22, 2018

Thermophoretic force on nonspherical particles in the free-molecule regime

Thu, 05/17/2018 - 11:00

Author(s): Song Yu, Jun Wang, Guodong Xia, and Luxiang Zong

The present paper is devoted to studying the thermophoresis of a nonspherical convex particle suspended in a gas with nonuniform temperature distribution in the free-molecule regime. Based on the gas kinetic theory and the assumption of a rigid-body collision for the gas-particle interaction, analyt...

[Phys. Rev. E 97, 053106] Published Thu May 17, 2018

Experimental measurement of interparticle acoustic radiation force in the Rayleigh limit

Wed, 05/16/2018 - 11:00

Author(s): Abhishek Ray Mohapatra, Shahrokh Sepehrirahnama, and Kian-Meng Lim

Acoustophoresis is a form of contact-free particle manipulation in microfluidic devices. The precision of manipulation can be enhanced with better understanding of the acoustic radiation force. In this paper we present the measurements of interparticle radiation force between a pair of polystyrene b...

[Phys. Rev. E 97, 053105] Published Wed May 16, 2018

Attached flow structure and streamwise energy spectra in a turbulent boundary layer

Mon, 05/14/2018 - 11:00

Author(s): S. Srinath, J. C. Vassilicos, C. Cuvier, J.-P. Laval, M. Stanislas, and J.-M. Foucaut

On the basis of (i) particle image velocimetry data of a turbulent boundary layer with large field of view and good spatial resolution and (ii) a mathematical relation between the energy spectrum and specifically modeled flow structures, we show that the scalings of the streamwise energy spectrum E1...

[Phys. Rev. E 97, 053103] Published Mon May 14, 2018