Physical Review E

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Recently published articles in Phys. Rev. E in the Table of Content section "Fluid dynamics"
Updated: 1 day 13 hours ago

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