Physical Review E

Subscribe to Physical Review E feed
Recently published articles in Phys. Rev. E in the Table of Content section "Fluid dynamics"
Updated: 1 day 23 hours ago

Electrohydrodynamic instability of premixed flames under manipulations of dc electric fields

Fri, 01/05/2018 - 10:00

Author(s): Yihua Ren, Wei Cui, and Shuiqing Li

We report an electrohydrodynamic instability in a premixed stagnation flame under manipulations of a dc electric field. This instability occurs when the electric field strength is at a certain value below the breakdown threshold, which is 0.75 kV/cm in the experimental setup. Above this value the fl...

[Phys. Rev. E 97, 013103] Published Fri Jan 05, 2018

Multiple eigenmodes of the Rayleigh-Taylor instability observed for a fluid interface with smoothly varying density

Thu, 01/04/2018 - 10:00

Author(s): C. X. Yu, C. Xue, J. Liu, X. Y. Hu, Y. Y. Liu, W. H. Ye, L. F. Wang, J. F. Wu, and Z. F. Fan

In this article, multiple eigen-systems including linear growth rates and eigen-functions have been discovered for the Rayleigh-Taylor instability (RTI) by numerically solving the Sturm-Liouville eigen-value problem in the case of two-dimensional plane geometry. The system called the first mode has ...

[Phys. Rev. E 97, 013102] Published Thu Jan 04, 2018

Mutual influence of molecular diffusion in gas and surface phases

Wed, 01/03/2018 - 10:00

Author(s): Takuma Hori, Takafumi Kamino, Yuta Yoshimoto, Shu Takagi, and Ikuya Kinefuchi

We develop molecular transport simulation methods that simultaneously deal with gas- and surface-phase diffusions to determine the effect of surface diffusion on the overall diffusion coefficients. The phenomenon of surface diffusion is incorporated into the test particle method and the mean square ...

[Phys. Rev. E 97, 013101] Published Wed Jan 03, 2018

Wavelet-based regularization of the Galerkin truncated three-dimensional incompressible Euler flows

Fri, 12/29/2017 - 10:00

Author(s): Marie Farge, Naoya Okamoto, Kai Schneider, and Katsunori Yoshimatsu

We present numerical simulations of the three-dimensional Galerkin truncated incompressible Euler equations that we integrate in time while regularizing the solution by applying a wavelet-based denoising. For this, at each time step, the vorticity field is decomposed into wavelet coefficients, which...

[Phys. Rev. E 96, 063119] Published Fri Dec 29, 2017

Computational investigation of Tb(III) ion line intensities in single-bubble sonoluminescence

Thu, 12/28/2017 - 10:00

Author(s): Jinfu Liang and Yu An

We perform a computational fluid dynamics simulation of trivalent terbium [Tb(III)] ion line emissions from single-bubble sonoluminescence (SBSL). Our simulation includes dynamic boundary conditions as well as the effects of gas properties and quenching by species, such as nitrite ion (NO2−). Simula...

[Phys. Rev. E 96, 063118] Published Thu Dec 28, 2017

Three-scale analysis of the permeability of a natural shale

Tue, 12/26/2017 - 10:00

Author(s): C. A. Davy and P. M. Adler

The macroscopic permeability of a natural shale is determined by using structural measurements on three different scales. Transmission electron microscopy yields two-dimensional (2D) images with pixels smaller than 1 nm; these images are used to reconstruct 3D nanostructures. Three-dimensional focus...

[Phys. Rev. E 96, 063116] Published Tue Dec 26, 2017

Towards uncovering the structure of power fluctuations of wind farms

Tue, 12/26/2017 - 10:00

Author(s): Huiwen Liu, Yaqing Jin, Nicolas Tobin, and Leonardo P. Chamorro

The structure of the turbulence-driven power fluctuations in a wind farm is fundamentally described from basic concepts. A derived tuning-free model, supported with experiments, reveals the underlying spectral content of the power fluctuations of a wind farm. It contains two power-law trends and osc...

[Phys. Rev. E 96, 063117] Published Tue Dec 26, 2017

Rayleigh-Taylor instability in accelerated elastic-solid slabs

Thu, 12/21/2017 - 10:00

Author(s): S. A. Piriz, A. R. Piriz, and N. A. Tahir

We develop the linear theory for the asymptotic growth of the incompressible Rayleigh-Taylor instability of an accelerated solid slab of density ρ2, shear modulus G, and thickness h, placed over a semi-infinite ideal fluid of density ρ1<ρ2. It extends previous results for Atwood number AT=1 [B. J...

[Phys. Rev. E 96, 063115] Published Thu Dec 21, 2017

Boundary conditions for a one-sided numerical model of evaporative instabilities in sessile drops of ethanol on heated substrates

Tue, 12/19/2017 - 10:00

Author(s): Sergey Semenov, Florian Carle, Marc Medale, and David Brutin

The work is focused on obtaining boundary conditions for a one-sided numerical model of thermoconvective instabilities in evaporating pinned sessile droplets of ethanol on heated substrates. In the one-sided model, appropriate boundary conditions for heat and mass transfer equations are required at ...

[Phys. Rev. E 96, 063113] Published Tue Dec 19, 2017

Control of viscous fingering by nanoparticles

Tue, 12/19/2017 - 10:00

Author(s): Nasser Sabet, Hassan Hassanzadeh, and Jalal Abedi

A substantial viscosity increase by the addition of a low dose of nanoparticles to the base fluids can well influence the dynamics of viscous fingering. There is a lack of detailed theoretical studies that address the effect of the presence of nanoparticles on unstable miscible displacements. In thi...

[Phys. Rev. E 96, 063114] Published Tue Dec 19, 2017

Intermittent direction reversals of moving spatially localized turbulence observed in two-dimensional Kolmogorov flow

Mon, 12/18/2017 - 10:00

Author(s): Yoshiki Hiruta and Sadayoshi Toh

We have found that in two-dimensional Kolmogorov flow a spatially localized turbulent state (SLT) exists stably and travels with a constant speed on average switching the moving direction randomly and intermittently for moderate values of the control parameters: Reynolds number and the flow rate. We...

[Phys. Rev. E 96, 063112] Published Mon Dec 18, 2017

Relative velocities in bidisperse turbulent suspensions

Thu, 12/14/2017 - 10:00

Author(s): J. Meibohm, L. Pistone, K. Gustavsson, and B. Mehlig

We investigate the distribution of relative velocities between small heavy particles of different sizes in turbulence by analyzing a statistical model for bidisperse turbulent suspensions, containing particles with two different Stokes numbers. This number, St, is a measure of particle inertia which...

[Phys. Rev. E 96, 061102(R)] Published Thu Dec 14, 2017

Turbulent transport and mixing in transitional Rayleigh-Taylor unstable flow: <i>A priori</i> assessment of gradient-diffusion and similarity modeling

Thu, 12/14/2017 - 10:00

Author(s): Oleg Schilling and Nicholas J. Mueschke

Data from a 1152×760×1280 direct numerical simulation [N. J. Mueschke and O. Schilling, Phys. Fluids 21, 014106 (2009)] of a Rayleigh-Taylor mixing layer modeled after a small-Atwood-number water-channel experiment is used to investigate the validity of gradient diffusion and similarity closures a p...

[Phys. Rev. E 96, 063111] Published Thu Dec 14, 2017

Analytical solutions for the profile of two-dimensional droplets with finite-length precursor films

Wed, 12/13/2017 - 10:00

Author(s): Carlos Alberto Perazzo, J. R. Mac Intyre, and J. M. Gomba

By means of the lubrication approximation we obtain the full family of static bidimensional profiles of a liquid resting on a substrate under partial-wetting conditions imposed by a disjoining-conjoining pressure. We show that for a set of quite general disjoining-conjoining pressure potentials, the...

[Phys. Rev. E 96, 063109] Published Wed Dec 13, 2017

Integral representation of channel flow with interacting particles

Wed, 12/13/2017 - 10:00

Author(s): Itzhak Fouxon, Zhouyang Ge, Luca Brandt, and Alexander Leshansky

We construct a boundary integral representation for the low-Reynolds-number flow in a channel in the presence of freely suspended particles (or droplets) of arbitrary size and shape. We demonstrate that lubrication theory holds away from the particles at horizontal distances exceeding the channel he...

[Phys. Rev. E 96, 063110] Published Wed Dec 13, 2017

Lattice Boltzmann heat transfer model for permeable voxels

Tue, 12/12/2017 - 10:00

Author(s): Gerald G. Pereira, Bisheng Wu, and Shakil Ahmed

We develop a gray-scale lattice Boltzmann (LB) model to study fluid flow combined with heat transfer for flow through porous media where voxels may be partially solid (or void). Heat transfer in rocks may lead to deformation, which in turn can modulate the fluid flow and so has significant contribut...

[Phys. Rev. E 96, 063108] Published Tue Dec 12, 2017

Forced underwater laminar flows with active magnetohydrodynamic metamaterials

Thu, 12/07/2017 - 10:00

Author(s): Dean Culver and Yaroslav Urzhumov

Theory and practical implementations for wake-free propulsion systems are proposed and proven with computational fluid dynamic modeling. Introduced earlier, the concept of active hydrodynamic metamaterials is advanced by introducing magnetohydrodynamic metamaterials, structures with custom-designed ...

[Phys. Rev. E 96, 063107] Published Thu Dec 07, 2017

Onset of fractional-order thermal convection in porous media

Wed, 12/06/2017 - 10:00

Author(s): Hamid Karani, Majid Rashtbehesht, Christian Huber, and Richard L. Magin

The macroscopic description of buoyancy-driven thermal convection in porous media is governed by advection-diffusion processes, which in the presence of thermophysical heterogeneities fail to predict the onset of thermal convection and the average rate of heat transfer. This work extends the classic...

[Phys. Rev. E 96, 063105] Published Wed Dec 06, 2017

Effect of an external field on capillary waves in a dipolar fluid

Wed, 12/06/2017 - 10:00

Author(s): Jason P. Koski, Stan G. Moore, Gary S. Grest, and Mark J. Stevens

The role of an external field on capillary waves at the liquid-vapor interface of a dipolar fluid is investigated using molecular dynamics simulations. For fields parallel to the interface, the interfacial width squared increases linearly with respect to the logarithm of the size of the interface ac...

[Phys. Rev. E 96, 063106] Published Wed Dec 06, 2017

Dynamics of nonspherical microbubble oscillations above instability threshold

Tue, 12/05/2017 - 10:00

Author(s): Matthieu Guédra, Sarah Cleve, Cyril Mauger, Philippe Blanc-Benon, and Claude Inserra

Time-resolved dynamics of nonspherical oscillations of micrometer-sized bubbles are captured and analyzed using high-speed imaging. The axisymmetry of the bubble shape is ensured with certainty for the first time from the recordings of two synchronous high-speed cameras located at 90∘. The temporal ...

[Phys. Rev. E 96, 063104] Published Tue Dec 05, 2017