# Physical Review E

*Updated:*1 day 23 hours ago

### Electroconvection in a dielectric liquid between two concentric half-cylinders with rigid walls: Linear and nonlinear analysis

Author(s): Pedro A. Vázquez, Alberto T. Pérez, Philippe Traoré, and Jian Wu

We study the linear stability and nonlinear behavior of the electroconvection between two concentric half-cylinders with no-slip conditions on all boundaries. The no-slip condition makes impossible to apply the standard modal approach. Hence, we apply a finite element technique similar to the one we...

[Phys. Rev. E 97, 023106] Published Tue Feb 20, 2018

### Energy transfer in compressible magnetohydrodynamic turbulence for isothermal self-gravitating fluids

Author(s): Supratik Banerjee and Alexei G. Kritsuk

Three-dimensional, compressible, magnetohydrodynamic turbulence of an isothermal, self-gravitating fluid is analyzed using two-point statistics in the asymptotic limit of large Reynolds numbers (both kinetic and magnetic). Following an alternative formulation proposed by Banerjee and Galtier [Phys. ...

[Phys. Rev. E 97, 023107] Published Tue Feb 20, 2018

### Statistics of the relative velocity of particles in turbulent flows: Monodisperse particles

Author(s): Akshay Bhatnagar, K. Gustavsson, and Dhrubaditya Mitra

We use direct numerical simulations to calculate the joint probability density function of the relative distance R and relative radial velocity component VR for a pair of heavy inertial particles suspended in homogeneous and isotropic turbulent flows. At small scales the distribution is scale invari...

[Phys. Rev. E 97, 023105] Published Thu Feb 15, 2018

### Is the kinetic equation for turbulent gas-particle flows ill posed?

Author(s): M. Reeks, D. C. Swailes, and A. D. Bragg

This paper is about the kinetic equation for gas-particle flows, in particular its well-posedness and realizability and its relationship to the generalized Langevin model (GLM) probability density function (PDF) equation. Previous analyses, e.g. [J.-P. Minier and C. Profeta, Phys. Rev. E **92**, 053020 ...

[Phys. Rev. E 97, 023104] Published Tue Feb 13, 2018

### Clogging in constricted suspension flows

Author(s): Alvaro Marin, Henri Lhuissier, Massimiliano Rossi, and Christian J. Kähler

The flow of a charged-stabilized suspension through a single constricted channel is studied experimentally by tracking the particles individually. Surprisingly, the behavior is found to be qualitatively similar to that of inertial dry granular systems: For small values of the neck-to-particle size r...

[Phys. Rev. E 97, 021102(R)] Published Wed Feb 07, 2018

### Nonthermal ice nucleation observed at distorted contact lines of supercooled water drops

Author(s): Fan Yang, Owen Cruikshank, Weilue He, Alex Kostinski, and Raymond A. Shaw

Ice nucleation is the crucial step for ice formation in atmospheric clouds and therefore underlies climatologically relevant precipitation and radiative properties. Progress has been made in understanding the roles of temperature, supersaturation, and material properties, but an explanation for the ...

[Phys. Rev. E 97, 023103] Published Tue Feb 06, 2018

### Breakup dynamics of toroidal droplets in shear-thinning fluids

Author(s): Alexandros A. Fragkopoulos, Ekapop Pairam, Luka Marinkovic, and Alberto Fernández-Nieves

We use toroidal droplets to study the breakup dynamics of a Newtonian liquid jet in the presence of rheologically nonlinear materials. We find that the droplets resist breakup for times that are longer than those in the presence of Newtonian liquids. More importantly, we show that our experiments ca...

[Phys. Rev. E 97, 021101(R)] Published Mon Feb 05, 2018

### Three-bead steering microswimmers

Author(s): Mohd Suhail Rizvi, Alexander Farutin, and Chaouqi Misbah

The self-propelled microswimmers have recently attracted considerable attention as model systems for biological cell migration as well as artificial micromachines. A simple and well-studied microswimmer model consists of three identical spherical beads joined by two springs in a linear fashion with ...

[Phys. Rev. E 97, 023102] Published Mon Feb 05, 2018

### Comment on “Effect of liquid temperature on sonoluminescence”

Author(s): Yuri A. Pishchalnikov

It has been suggested that bubble-wall velocities cannot exceed the sound speed in the liquid at the bubble wall [K. Yasui, Phys. Rev. E **64**, 016310 (2001).]. Here we show that this upper bound was derived omitting the partial derivatives with respect to time, i.e., assuming that the flow was in the ...

[Phys. Rev. E 97, 027101] Published Mon Feb 05, 2018

### Mixing and pumping by pairs of helices in a viscous fluid

Author(s): Amy Buchmann, Lisa J. Fauci, Karin Leiderman, Eva Strawbridge, and Longhua Zhao

Here, we study the fluid dynamics of a pair of rigid helices rotating at a constant velocity, tethered at their bases, in a viscous fluid. Our computations use a regularized Stokeslet framework, both with and without a bounding plane, so we are able to discern precisely what flow features are unacco...

[Phys. Rev. E 97, 023101] Published Thu Feb 01, 2018

### Generation of anisotropy in turbulent flows subjected to rapid distortion

Author(s): Timothy T. Clark, Susan Kurien, and Robert Rubinstein

A computational tool for the anisotropic time-evolution of the spectral velocity correlation tensor is presented. We operate in the linear, rapid distortion limit of the mean-field-coupled equations. Each term of the equations is written in the form of an expansion to arbitrary order in the basis of...

[Phys. Rev. E 97, 013112] Published Tue Jan 23, 2018

### Ultrasonic measurements of the bulk flow field in foams

Author(s): Richard Nauber, Lars Büttner, Kerstin Eckert, Jochen Fröhlich, Jürgen Czarske, and Sascha Heitkam

The flow field of moving foams is relevant for basic research and for the optimization of industrial processes such as froth flotation. However, no adequate measurement technique exists for the local velocity distribution inside the foam bulk. We have investigated the ultrasound Doppler velocimetry ...

[Phys. Rev. E 97, 013113] Published Tue Jan 23, 2018

### Absolute and convective instabilities of a film flow down a vertical fiber subjected to a radial electric field

Author(s): Rong Liu, Xue Chen, and Zijing Ding

We consider the motion of a gravity-driven flow down a vertical fiber subjected to a radial electric field. This flow exhibits rich dynamics including the formation of droplets, or beads, driven by a Rayleigh-Plateau mechanism modified by the presence of gravity as well as the Maxwell stress at the ...

[Phys. Rev. E 97, 013109] Published Mon Jan 22, 2018

### Three-dimensional instabilities for the flow around a heaving foil

Author(s): Liping Sun, Jian Deng, and Xueming Shao

This paper investigates the three-dimensional instabilities of the flow past a periodically heaving airfoil. By comparison with a pitching foil [Deng *et al.*, Phys. Rev. E **92**, 063013 (2015)], here we present distinctive characteristics for the heaving foil, particulary regarding its Floquet modes. B...

[Phys. Rev. E 97, 013110] Published Mon Jan 22, 2018

### Colloidal particle electrorotation in a nonuniform electric field

Author(s): Yi Hu, Petia M. Vlahovska, and Michael J. Miksis

A model to study the dynamics of colloidal particles in nonuniform electric fields is proposed. For an isolated sphere, the conditions and threshold for sustained (Quincke) rotation in a linear direct current (dc) field are determined. Particle dynamics becomes more complex with increasing electric ...

[Phys. Rev. E 97, 013111] Published Mon Jan 22, 2018

### Model for the growth and the oscillation of a cavitation bubble in a spherical liquid-filled cavity enclosed in an elastic medium

Author(s): Alexander A. Doinikov, Benjamin Dollet, and Philippe Marmottant

Equations are derived that describe the growth and subsequent damped oscillation of a cavitation bubble in a liquid-filled cavity surrounded by an elastic solid. It is assumed that the nucleation and the growth of the bubble are caused by an initial negative pressure in the cavity. The liquid is tre...

[Phys. Rev. E 97, 013108] Published Wed Jan 17, 2018

### Kullback-Leibler divergence measure of intermittency: Application to turbulence

Author(s): Carlos Granero-Belinchón, Stéphane G. Roux, and Nicolas B. Garnier

For generic systems exhibiting power law behaviors, and hence multiscale dependencies, we propose a simple tool to analyze multifractality and intermittency, after noticing that these concepts are directly related to the deformation of a probability density function from Gaussian at large scales to ...

[Phys. Rev. E 97, 013107] Published Tue Jan 16, 2018

### Thermal convection in three-dimensional fractured porous media

Author(s): C. Mezon, V. V. Mourzenko, J.-F. Thovert, R. Antoine, F. Fontaine, A. Finizola, and P. M. Adler

Thermal convection is numerically computed in three-dimensional (3D) fluid saturated isotropically fractured porous media. Fractures are randomly inserted as two-dimensional (2D) convex polygons. Flow is governed by Darcy's 2D and 3D laws in the fractures and in the porous medium, respectively; exch...

[Phys. Rev. E 97, 013106] Published Thu Jan 11, 2018

### Two-length-scale turbulence model for self-similar buoyancy-, shock-, and shear-driven mixing

Author(s): Brandon E. Morgan, Oleg Schilling, and Tucker A. Hartland

The three-equation k−L−a turbulence model [B. Morgan and M. Wickett, Three-equation model for the self-similar growth of Rayleigh-Taylor and Richtmyer-Meshkov instabilities, Phys. Rev. E **91**, 043002 (2015)] is extended by the addition of a second length scale equation. It is shown that the separation...

[Phys. Rev. E 97, 013104] Published Wed Jan 10, 2018

### High-speed broadband elastic actuator in water using induced-charge electro-osmosis with a skew structure

Author(s): Hideyuki Sugioka and Naoki Nakano

An artificial cilium using ac electro-osmosis (ACEO) is attractive because of its large potentiality for innovative microfluidic applications. However, the ACEO cilium has not been probed experimentally and has a shortcoming that the working frequency range is very narrow. Thus, we here propose an A...

[Phys. Rev. E 97, 013105] Published Wed Jan 10, 2018