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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Vibroequilibria in microgravity: Comparison of experiments and theory

Tue, 12/10/2019 - 10:00

Author(s): P. Salgado Sánchez, J. Fernández, I. Tinao, and J. Porter

Experiments on vibrated fluids confined in cylindrical and cuboidal containers were performed under the reduced gravity conditions of a parabolic flight. The results constitute a systematic quantitative investigation of the vibroequilibria effect, which refers to the reorientation of vibrated fluids...

[Phys. Rev. E 100, 063103] Published Tue Dec 10, 2019

Effects of phase lag on the hovering flight of damselfly and dragonfly

Wed, 12/04/2019 - 10:00

Author(s): Pei-Yi Zou, Yu-Hsiang Lai, and Jing-Tang Yang

In this work we studied the differences in flight kinematics and aerodynamics that could relate to differences in wing morphologies of a dragonfly and a damselfly. The damselflies and dragonflies normally fly with the fore wing or hind wing in the lead, respectively. The wing of the damselfly is pet...

[Phys. Rev. E 100, 063102] Published Wed Dec 04, 2019

Generation of a large-scale vorticity in a fast-rotating density-stratified turbulence or turbulent convection

Mon, 12/02/2019 - 10:00

Author(s): Igor Rogachevskii and Nathan Kleeorin

We find an instability resulting in generation of large-scale vorticity in a fast-rotating small-scale turbulence or turbulent convection with inhomogeneous fluid density along the rotational axis in anelastic approximation. The large-scale instability causes excitation of two modes: (i) the mode wi...

[Phys. Rev. E 100, 063101] Published Mon Dec 02, 2019

Generation of bursting magnetic fields by nonperiodic torsional flows

Tue, 11/26/2019 - 10:00

Author(s): Juan Sánchez Umbría and Marta Net

A mechanism for the cyclic generation of bursts of magnetic fields by nonlinear torsional flows of complex time dependence but very simple spatial structure is described. These flows were obtained numerically as axisymmetric solutions of convection in internally heated rotating fluid spheres in the ...

[Phys. Rev. E 100, 053110] Published Tue Nov 26, 2019

Evolution of Gaussian wave packets in capillary jets

Tue, 11/26/2019 - 10:00

Author(s): F. J. García, H. González, F. J. Gómez-Aguilar, A. A. Castrejón-Pita, and J. R. Castrejón-Pita

A temporal analysis of the evolution of Gaussian wave packets in cylindrical capillary jets is presented through both a linear two-mode formulation and a one-dimensional nonlinear numerical scheme. These analyses are normally applicable to arbitrary initial conditions but our study focuses on pure-i...

[Phys. Rev. E 100, 053111] Published Tue Nov 26, 2019

Dynamics of two-dimensional flow around a circular cylinder with flexible filaments attached

Mon, 11/25/2019 - 10:00

Author(s): Jian Deng, Xuerui Mao, and Fangfang Xie

A direction adaptive approach for the reduction of drag and the suppression of lift fluctuation in flow passing a circular cylinder is developed. Flexible filaments are attached to the surface of the cylinder, and different configurations, including the number, lengths, and angles of attachment of t...

[Phys. Rev. E 100, 053107] Published Mon Nov 25, 2019

Two jets during the impact of viscous droplets onto a less-viscous liquid pool

Mon, 11/25/2019 - 10:00

Author(s): Quan Ding, Tianyou Wang, and Zhizhao Che

It is generally accepted that a Worthington jet occurs when a droplet impacts onto a liquid pool. However, in this experimental study of the impact of viscous droplets onto a less-viscous liquid pool, we identify another jet besides the Worthington jet, forming a two-jet phenomenon. The two jets, a ...

[Phys. Rev. E 100, 053108] Published Mon Nov 25, 2019

Interfacial dynamics and pinch-off singularities for axially symmetric Darcy flow

Mon, 11/25/2019 - 10:00

Author(s): Liam C. Morrow, Michael C. Dallaston, and Scott W. McCue

We study a model for the evolution of an axially symmetric bubble of inviscid fluid in a homogeneous porous medium otherwise saturated with a viscous fluid. The model is a moving boundary problem that is a higher-dimensional analog of Hele-Shaw flow. Here we are concerned with the development of pin...

[Phys. Rev. E 100, 053109] Published Mon Nov 25, 2019

Harmonic and subharmonic waves on the surface of a vibrated liquid drop

Wed, 11/20/2019 - 10:00

Author(s): Ivan S. Maksymov and Andrey Pototsky

Liquid drops and vibrations are ubiquitous in both everyday life and technology, and their combination can often result in fascinating physical phenomena opening up intriguing opportunities for practical applications in biology, medicine, chemistry, and photonics. Here we study, theoretically and ex...

[Phys. Rev. E 100, 053106] Published Wed Nov 20, 2019

Stability of a jet moving in a rectangular microchannel

Mon, 11/18/2019 - 10:00

Author(s): M. G. Cabezas, M. A. Herrada, and José M. Montanero

We study numerically the basic flow and linear stability of a capillary jet confined in a rectangular microchannel. We consider both the case where the interface does not touch the solid surfaces and that in which the jet adheres to them with a contact angle slightly smaller than 180∘. Given an arbi...

[Phys. Rev. E 100, 053104] Published Mon Nov 18, 2019

Determination of energy flux rate in homogeneous ferrohydrodynamic turbulence using two-point statistics

Mon, 11/18/2019 - 10:00

Author(s): Sukhdev Mouraya and Supratik Banerjee

Under the influence of an external magnetic field H, the suspended ferromagnetic particles of a laminar ferrofluid flow try to be oriented along H through a relaxation mechanism. Turbulence affects the interaction between the magnetization of each suspended particle and the external field thereby le...

[Phys. Rev. E 100, 053105] Published Mon Nov 18, 2019

Rotating magnetic nanorods detect minute fluctuations of magnetic field

Wed, 11/13/2019 - 10:00

Author(s): Vaibhav Palkar, Pavel Aprelev, Arthur Salamatin, Artis Brasovs, Olga Kuksenok, and Konstantin G. Kornev

Magnetic nanorods rotating in a viscous liquid are very sensitive to any ambient magnetic field. We theoretically predicted and experimentally validated the conditions for two-dimensional synchronous and asynchronous rotation as well as three-dimensional precession and tumbling of nanorods in an amb...

[Phys. Rev. E 100, 051101(R)] Published Wed Nov 13, 2019

Lagrangian coherent sets in turbulent Rayleigh-Bénard convection

Mon, 11/11/2019 - 10:00

Author(s): Christiane Schneide, Martin Stahn, Ambrish Pandey, Oliver Junge, Péter Koltai, Kathrin Padberg-Gehle, and Jörg Schumacher

Coherent circulation rolls and their relevance for the turbulent heat transfer in a two-dimensional Rayleigh-Bénard convection model are analyzed. The flow is in a closed cell of aspect ratio four at a Rayleigh number Ra=106 and at a Prandtl number Pr=10. Three different Lagrangian analysis techniqu...

[Phys. Rev. E 100, 053103] Published Mon Nov 11, 2019

Nanocatalytic chemohydrodynamic instability: Deposition effects

Fri, 11/08/2019 - 10:00

Author(s): B. Dastvareh, J. Azaiez, and P. A. Tsai

Due to the high surface area to volume ratio of nanoparticles, nanocatalytic reactive flows are widely utilized in various applications, such as water purification, fuel cell, energy storage, and biodiesel production. The implementation of nanocatalysts in porous media flow, such as oil recovery and...

[Phys. Rev. E 100, 053102] Published Fri Nov 08, 2019

Energy and enstrophy spectra and fluxes for the inertial-dissipation range of two-dimensional turbulence

Mon, 11/04/2019 - 10:00

Author(s): Akanksha Gupta, Rohith Jayaram, Anando G. Chaterjee, Shubhadeep Sadhukhan, Ravi Samtaney, and Mahendra K. Verma

In this paper, using Pao's conjecture [Y.-H. Pao, Phys. Fluids 8, 1063 (1965)], we derive expressions for the spectra and fluxes of kinetic energy and enstrophy for two-dimensional (2D) forced turbulence that extend beyond the inertial range. In these expressions, the fluxes and the spectra contain ...

[Phys. Rev. E 100, 053101] Published Mon Nov 04, 2019

Kinetic and internal energy transfer in implicit large-eddy simulations of forced compressible turbulence

Thu, 10/31/2019 - 10:00

Author(s): Wolfram Schmidt and Philipp Grete

We revisit the problem of how energy transfer through the turbulent cascade operates in compressible hydrodynamic turbulence. In general, there is no conservative compressible cascade since the kinetic and internal energy reservoirs can exchange energy through pressure dilatation. Moreover, statisti...

[Phys. Rev. E 100, 043116] Published Thu Oct 31, 2019

Transition to bound states for bacteria swimming near surfaces

Thu, 10/31/2019 - 10:00

Author(s): Debasish Das and Eric Lauga

The plethora of swimming techniques developed by bacteria suggest that how they swim depends on their environment, size, and shape. This study provides interesting insights into this problem. The authors theoretically and numerically investigate the transition from swimming to a surface-bound state observed in unusual gigantic bacteria.

[Phys. Rev. E 100, 043117] Published Thu Oct 31, 2019

Mechanisms controlling fluid breakup and reconnection during two-phase flow in porous media

Tue, 10/29/2019 - 10:00

Author(s): Catherine Spurin, Tom Bultreys, Branko Bijeljic, Martin J. Blunt, and Samuel Krevor

The use of Darcy's law to describe steady-state multiphase flow in porous media has been justified by the assumption that the fluids flow in continuously connected pathways. However, a range of complex interface dynamics have been observed during macroscopically steady-state flow, including intermit...

[Phys. Rev. E 100, 043115] Published Tue Oct 29, 2019

Electrospray cone-jet mode for weakly viscoelastic liquids

Mon, 10/28/2019 - 10:00

Author(s): S. Blanco-Trejo, M. A. Herrada, A. M. Gañán-Calvo, and José M. Montanero

We study theoretically the influence of viscoelasticity on the steady cone-jet mode of electrospray for small stress relaxation times. For this purpose, we numerically integrate the leaky-dielectric model together with the Oldroyd-B constitutive relationship and calculate both the base flow and line...

[Phys. Rev. E 100, 043114] Published Mon Oct 28, 2019

Spiral chain models of two-dimensional turbulence

Fri, 10/25/2019 - 11:00

Author(s): Ö. D. Gürcan, Shaokang Xu, and P. Morel

Reduced models, mirroring self-similar, fractal nature of two-dimensional turbulence, are proposed, using logarithmic spiral chains, which provide a natural generalization of shell models to two dimensions. In a turbulent cascade, where each step can be represented by a rotation and a scaling of the...

[Phys. Rev. E 100, 043113] Published Fri Oct 25, 2019