Physical Review E

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Recently published articles in Phys. Rev. E in the Table of Content section "Fluid dynamics"
Updated: 11 hours 26 min ago

Statics and dynamics of polymeric droplets on chemically homogeneous and heterogeneous substrates

Thu, 08/22/2019 - 11:00

Author(s): Ö. Öztürk and J. Servantie

We present a molecular dynamics study of the motion of cylindrical polymer droplets on striped surfaces. We first consider the equilibrium properties of droplets on different surfaces, we show that for small stripes the Cassie-Baxter equation gives a good approximation of the equilibrium contact ang...

[Phys. Rev. E 100, 023113] Published Thu Aug 22, 2019

Wall-mounted flexible plates in a two-dimensional channel trigger early flow instabilities

Tue, 08/20/2019 - 11:00

Author(s): Gaurav Singh and Rajaram Lakkaraju

A high level of mixing by passive means is a desirable feature in microchannels for various applications, and use of flexible obstacles (or plates) is one of the prime choices in that regard. To gain further insight, we carry out two-dimensional numerical simulations for flow past one or two flexibl...

[Phys. Rev. E 100, 023109] Published Tue Aug 20, 2019

Identifying the pattern of breakdown in a laminar-turbulent transition via binary sequence statistics and cellular-automaton simulations

Tue, 08/20/2019 - 11:00

Author(s): Wen Zhang, Peiqing Liu, Hao Guo, Minping Wan, Jianchun Wang, and Shiyi Chen

The laminar-turbulent transition induced by two-dimensional steplike roughness is investigated focusing on the pattern of breakdown. The statistics of the turbulent burst rate is found to be significantly different from the prediction of the classical theory. A systematic investigation of the patter...

[Phys. Rev. E 100, 023110] Published Tue Aug 20, 2019

Density and tracer statistics in compressible turbulence: Phase transition to multifractality

Tue, 08/20/2019 - 11:00

Author(s): Itzhak Fouxon and Michael Mond

We study the statistics of fluid (gas) density and concentration of passive tracer particles (dust) in compressible turbulence. As Ma increases from small or moderate values, the density and the concentration in the inertial range go through a phase transition from a finite continuous smooth distrib...

[Phys. Rev. E 100, 023111] Published Tue Aug 20, 2019

Effects of electronic friction from the walls on water flow in carbon nanotubes and on water desalination

Tue, 08/20/2019 - 11:00

Author(s): J. B. Sokoloff

A mechanism for removal of salt from salt water is discussed, which results from friction due to Ohm's law heating, resulting from motion of an electron charge induced in the tube walls by the water molecules’ dipoles and the ions’ charges. The desalination occurs because this friction is larger for...

[Phys. Rev. E 100, 023112] Published Tue Aug 20, 2019

Defect production by pure phase twist injection as Aharonov-Bohm effect

Fri, 08/16/2019 - 11:00

Author(s): Matteo Foresti and Renzo L. Ricca

In this paper we demonstrate that new phase defects of the Gross-Pitaevskii equation (GPE) can be produced as a Aharonov-Bohm effect resulting from pure phase twist injection on existing defects. This is a phenomenon that has physical justification in the hydrodynamic interpretation of GPE. Here we ...

[Phys. Rev. E 100, 023107] Published Fri Aug 16, 2019

Molecular simulation of thin liquid films: Thermal fluctuations and instability

Fri, 08/16/2019 - 11:00

Author(s): Yixin Zhang, James E. Sprittles, and Duncan A. Lockerby

This work combines molecular dynamics simulations with analytical techniques to study the effect of thermal fluctuations on the stability of thin liquid films. Results from a stochastic thin-film equation agree well with those from the simulations, but disagree with a deterministic equation. The authors conclude that thermal fluctuations play an important role in the dynamics of thin films at the nanoscale.

[Phys. Rev. E 100, 023108] Published Fri Aug 16, 2019

Superfluidity inside carbon nanotubes

Tue, 08/13/2019 - 11:00

Author(s): Leonid. V. Mirantsev

Molecular dynamics simulations of equilibrium structures and flows of nonpolar argon atoms confined by single-walled carbon nanotubes (SWCNTs) with circular cross section and rectangular cross section having the same area and the ratio between its sides 1:4 have been performed. It has been shown tha...

[Phys. Rev. E 100, 023106] Published Tue Aug 13, 2019

Bulk-driven acoustic streaming at resonance in closed microcavities

Wed, 08/07/2019 - 11:00

Author(s): Jacob S. Bach and Henrik Bruus

Bulk-driven acoustic (Eckart) streaming is the steady flow resulting from the time-averaged acoustic energy flux density in the bulk of a viscous fluid. In simple cases, like the one-dimensional single standing-wave resonance, this energy flux is negligible, and therefore the bulk-driven streaming i...

[Phys. Rev. E 100, 023104] Published Wed Aug 07, 2019

Numerical investigation of vibration-induced droplet shedding on smooth surfaces with large contact angles

Wed, 08/07/2019 - 11:00

Author(s): Mostafa Moradi, Mohammad Hassan Rahimian, and Seyed Farshid Chini

In this work, numerical simulations are performed to study the droplet response to the vertical vibration of the substrate, under various frequencies and amplitudes using the multiphase lattice Boltzmann method. First, the numerical results are validated against published experimental data. The effe...

[Phys. Rev. E 100, 023105] Published Wed Aug 07, 2019

Large effect of lateral box size in molecular dynamics simulations of liquid-solid friction

Mon, 08/05/2019 - 11:00

Author(s): Koshun Ogawa, Haruki Oga, Hiroki Kusudo, Yasutaka Yamaguchi, Takeshi Omori, Samy Merabia, and Laurent Joly

Molecular dynamics simulations are a powerful tool to characterize liquid-solid friction. A slab configuration with periodic boundary conditions in the lateral dimensions is commonly used, where the measured friction coefficient could be affected by the finite lateral size of the simulation box. Her...

[Phys. Rev. E 100, 023101] Published Mon Aug 05, 2019

Heavy particles in a persistent random flow with traps

Mon, 08/05/2019 - 11:00

Author(s): J. Meibohm and B. Mehlig

We study a one-dimensional model for heavy particles in a compressible fluid. The fluid-velocity field is modeled by a persistent Gaussian random function, and the particles are assumed to be weakly inertial. Since one-dimensional fluid-velocity fields are always compressible, the model exhibits spa...

[Phys. Rev. E 100, 023102] Published Mon Aug 05, 2019

Kelvin-Helmholtz and Holmboe instabilities of a diffusive interface between miscible phases

Mon, 08/05/2019 - 11:00

Author(s): T. Zagvozkin, A. Vorobev, and T. Lyubimova

The stability of a shear flow imposed along a diffusive interface that separates two miscible liquids (a heavier liquid lies underneath) is studied using direct numerical simulations. The phase-field approach is employed for description of a thermo- and hydrodynamic evolution of a heterogeneous bina...

[Phys. Rev. E 100, 023103] Published Mon Aug 05, 2019

Kinetics of coarsening have dramatic effects on the microstructure: Self-similarity breakdown induced by viscosity contrast

Mon, 07/29/2019 - 11:00

Author(s): Hervé Henry and György Tegze

The viscous coarsening of a phase separated mixture is studied and the effects of the viscosity contrast between the phases are investigated. From an analysis of the microstructure, it appears that for moderate departure from the perfectly symmetric regime the self-similar bicontinuous regime is rob...

[Phys. Rev. E 100, 013116] Published Mon Jul 29, 2019

Nonlinear stability results for plane Couette and Poiseuille flows

Fri, 07/26/2019 - 11:00

Author(s): Paolo Falsaperla, Andrea Giacobbe, and Giuseppe Mulone

We prove that the plane Couette and Poiseuille flows are nonlinearly stable if the Reynolds number is less than ReOrr(2π/(λsinθ))/sinθ when a perturbation is a tilted perturbation in the direction x′ which forms an angle θ∈(0,π/2] with the direction i of the basic motion and does not depend on x′. R...

[Phys. Rev. E 100, 013113] Published Fri Jul 26, 2019

Clustering and energy spectra in two-dimensional dusty gas turbulence

Fri, 07/26/2019 - 11:00

Author(s): Vikash Pandey, Prasad Perlekar, and Dhrubaditya Mitra

This work presents two-dimensional simulations of particles embedded in a turbulent flow. The particles are capable of modifying the flow by interacting with the fluid. The authors study the behavior of this system as the Stokes number and the particle concentration change, and uncover a new scaling behavior that shows a dependence on those two variables.

[Phys. Rev. E 100, 013114] Published Fri Jul 26, 2019

Electrical conductivity and tortuosity of solid foam: Effect of pore connections

Fri, 07/26/2019 - 11:00

Author(s): V. Langlois, V. H. Trinh, and C. Perrot

Numerical and analytical methods at both micro- and mesoscales are used to study how the electrical resistivity and the high-frequency tortuosity of solid foam are modified by the presence of membranes that partially or totally close the cell windows connecting neighbor pores. Finite-element-method ...

[Phys. Rev. E 100, 013115] Published Fri Jul 26, 2019

Heteroclinic and homoclinic connections in a Kolmogorov-like flow

Thu, 07/25/2019 - 11:00

Author(s): Balachandra Suri, Ravi Kumar Pallantla, Michael F. Schatz, and Roman O. Grigoriev

Recent studies suggest that unstable recurrent solutions of the Navier-Stokes equation provide new insights into dynamics of turbulent flows. In this study, we compute an extensive network of dynamical connections between such solutions in a weakly turbulent quasi-two-dimensional Kolmogorov flow tha...

[Phys. Rev. E 100, 013112] Published Thu Jul 25, 2019

Flame evolution in shock-accelerated flow under different reactive gas mixture gradients

Tue, 07/23/2019 - 11:00

Author(s): Yuejin Zhu, Longkun Gao, Kai Hong Luo, Jianfeng Pan, Zhenhua Pan, and Penggang Zhang

The interaction between a planar shock wave and a spherical flame is studied numerically for an ethylene-oxygen-nitrogen gas mixture. Influences of different initial reactive gas mixture gradients on the shock-flame interaction are investigated by using high-resolution computational simulations. The...

[Phys. Rev. E 100, 013111] Published Tue Jul 23, 2019

Porosity effects in laminar fluid flow near permeable surfaces

Mon, 07/22/2019 - 11:00

Author(s): Changwoo Kang and Parisa Mirbod

This work analyzes the porosity effects on laminar flow and drag reduction of Newtonian fluids flowing over and through permeable surfaces. A fully developed laminar flow in a channel partially replaced with a porous material is considered. The analytical solutions for the velocity and shear stress ...

[Phys. Rev. E 100, 013109] Published Mon Jul 22, 2019