Physical Review E

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Recently published articles in Phys. Rev. E in the Table of Content section "Fluid dynamics"
Updated: 2 days 5 hours ago

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

Validation of model predictions of pore-scale fluid distributions during two-phase flow

Mon, 05/14/2018 - 11:00

Author(s): Tom Bultreys, Qingyang Lin, Ying Gao, Ali Q. Raeini, Ahmed AlRatrout, Branko Bijeljic, and Martin J. Blunt

Pore-scale two-phase flow modeling is an important technology to study a rock's relative permeability behavior. To investigate if these models are predictive, the calculated pore-scale fluid distributions which determine the relative permeability need to be validated. In this work, we introduce a me...

[Phys. Rev. E 97, 053104] Published Mon May 14, 2018

Experimental study on the evolution of Peregrine breather with uniform-depth adverse currents

Mon, 05/07/2018 - 11:00

Author(s): B. Liao, Y. Ma, X. Ma, and G. Dong

A series of laboratory experiments were performed to study the evolution of Peregrine breather (PB) in a wave flume in finite depth, and wave trains were initially generated in a region of quiescent water and then propagated into an adverse current region for which the current velocity strength grad...

[Phys. Rev. E 97, 053102] Published Mon May 07, 2018

Dissipation, intermittency, and singularities in incompressible turbulent flows

Thu, 05/03/2018 - 11:00

Author(s): P. Debue, V. Shukla, D. Kuzzay, D. Faranda, E.-W. Saw, F. Daviaud, and B. Dubrulle

We examine the connection between the singularities or quasisingularities in the solutions of the incompressible Navier-Stokes equation (INSE) and the local energy transfer and dissipation, in order to explore in detail how the former contributes to the phenomenon of intermittency. We do so by analy...

[Phys. Rev. E 97, 053101] Published Thu May 03, 2018

Shock-wave structure based on the Navier-Stokes-Fourier equations

Mon, 04/30/2018 - 11:00

Author(s): F. J. Uribe and R. M. Velasco

We use the Navier-Stokes-Fourier constitutive equations to study plane shock waves in dilute gases. It is shown that the experimental information on the normalized density profiles can be fit by using the so-called soft sphere model, in which the viscosity and thermal conductivity are proportional t...

[Phys. Rev. E 97, 043117] Published Mon Apr 30, 2018

One-dimensional reduction of viscous jets. I. Theory

Tue, 04/24/2018 - 11:00

Author(s): Cyril Pitrou

We build a general formalism to describe thin viscous jets as one-dimensional objects with an internal structure. We present in full generality the steps needed to describe the viscous jets around their central line, and we argue that the Taylor expansion of all fields around that line is convenient...

[Phys. Rev. E 97, 043115] Published Tue Apr 24, 2018

One-dimensional reduction of viscous jets. II. Applications

Tue, 04/24/2018 - 11:00

Author(s): Cyril Pitrou

In a companion paper [Phys. Rev. E 97, 043115 (2018)], a formalism allowing to describe viscous fibers as one-dimensional objects was developed. We apply it to the special case of a viscous fluid torus. This allows to highlight the differences with the basic viscous string model and with its viscous...

[Phys. Rev. E 97, 043116] Published Tue Apr 24, 2018

Electrohydrodynamic channeling effects in narrow fractures and pores

Mon, 04/23/2018 - 11:00

Author(s): Asger Bolet, Gaute Linga, and Joachim Mathiesen

In low-permeability rock, fluid and mineral transport occur in pores and fracture apertures at the scale of micrometers and below. At this scale, the presence of surface charge, and a resultant electrical double layer, may considerably alter transport properties. However, due to the inherent nonline...

[Phys. Rev. E 97, 043114] Published Mon Apr 23, 2018

Discontinuous contact line motion of evaporating particle-laden droplet on superhydrophobic surfaces

Fri, 04/20/2018 - 11:00

Author(s): Yutaka Yamada and Akihiko Horibe

The three-phase contact line motion on a superhydrophobic surface through particle-laden sessile droplet evaporation was investigated. Sample surfaces with micro- and nanoscale structures were generated by various durations of chemical treatment and SiO2 spherical particles with different sizes were...

[Phys. Rev. E 97, 043113] Published Fri Apr 20, 2018

Appearance of deterministic mixing behavior from ensembles of fluctuating hydrodynamics simulations of the Richtmyer-Meshkov instability

Thu, 04/19/2018 - 11:00

Author(s): Kiran Narayanan and Ravi Samtaney

We obtain numerical solutions of the two-fluid fluctuating compressible Navier-Stokes (FCNS) equations, which consistently account for thermal fluctuations from meso- to macroscales, in order to study the effect of such fluctuations on the mixing behavior in the Richtmyer-Meshkov instability (RMI). ...

[Phys. Rev. E 97, 043111] Published Thu Apr 19, 2018

Dynamics of deformation and pinch-off of a migrating compound droplet in a tube

Thu, 04/19/2018 - 11:00

Author(s): Manash Pratim Borthakur, Gautam Biswas, and Dipankar Bandyopadhyay

A computational fluid dynamic investigation has been carried out to study the dynamics of a moving compound droplet inside a tube. The motions associated with such a droplet is uncovered by solving the axisymmetric Navier-Stokes equations in which the spatiotemporal evolution of a pair of twin-defor...

[Phys. Rev. E 97, 043112] Published Thu Apr 19, 2018

Soap-film flow induced by electric fields in asymmetric frames

Tue, 04/17/2018 - 11:00

Author(s): S. Mollaei, M. Nasiri, N. Soltanmohammadi, R. Shirsavar, A. Ramos, and A. Amjadi

Net fluid flow of soap films induced by (ac or dc) electric fields in asymmetric frames is presented. Previous experiments of controllable soap film flow required the simultaneous use of an electrical current passing through the film and an external electric field or the use of nonuniform ac electri...

[Phys. Rev. E 97, 043110] Published Tue Apr 17, 2018

Onset of density-driven instabilities in fractured aquifers

Thu, 04/12/2018 - 11:00

Author(s): Seyed Mostafa Jafari Raad and Hassan Hassanzadeh

Linear stability analysis is conducted to study the onset of density-driven convection involved in solubility trapping of CO2 in fractured aquifers. The effect of physical properties of a fracture network on the stability of a diffusive boundary layer in a saturated fractured porous media is investi...

[Phys. Rev. E 97, 043109] Published Thu Apr 12, 2018

Effect of shock waves on the statistics and scaling in compressible isotropic turbulence

Wed, 04/11/2018 - 11:00

Author(s): Jianchun Wang, Minping Wan, Song Chen, Chenyue Xie, and Shiyi Chen

This paper examines the spectra of the velocity and several thermodynamic variables in compressible turbulence in the presence of large-scale shock waves. The authors perform simulations of turbulence driven by solenoidal and compressible forces for a range of Mach numbers, and are able to extract different scaling behaviors. In addition, they propose heuristic ways to account for the observations.

[Phys. Rev. E 97, 043108] Published Wed Apr 11, 2018