# Physical Review E

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### Convective flow in the presence of a small obstacle: Symmetry breaking, attractors, hysteresis, and information

Author(s): S. J. Bartlett and Y. L. Yung

This work explores the stability and hysteresis effects that occur when a small sink of momentum is introduced into a heat-driven, two-dimensional convective flow. As per standard fluid mechanical intuition, the system minimizes work generation and dissipation when one component of momentum is extra...

[Phys. Rev. E 99, 033103] Published Mon Mar 04, 2019

### Onset of intermittency in stochastic Burgers hydrodynamics

Author(s): G. B. Apolinário, L. Moriconi, and R. M. Pereira

We study the onset of intermittency in stochastic Burgers hydrodynamics, as characterized by the statistical behavior of negative velocity gradient fluctuations. The analysis is based on the response functional formalism, where specific velocity configurations—the *viscous instantons*—are assumed to p...

[Phys. Rev. E 99, 033104] Published Mon Mar 04, 2019

### Wavelength selection of vortex ripples in an oscillating cylinder: The effect of curvature and background rotation

Author(s): M. Duran-Matute, M. D. van Gorp, and G. J. F. van Heijst

We present results of laboratory experiments on the formation, evolution, and wavelength selection of vortex ripples. These ripples formed on a sediment bed at the bottom of a water-filled oscillating cylindrical tank mounted on top of a rotating table. The table is made to oscillate sinusoidally in...

[Phys. Rev. E 99, 033105] Published Mon Mar 04, 2019

### Swimming sheet near a plane surfactant-laden interface

Author(s): Vaseem A. Shaik and Arezoo M. Ardekani

In this work we analyze the velocity of a swimming sheet near a plane surfactant-laden interface by assuming the Reynolds number and the sheet's deformation to be small. We observe a nonmonotonic dependence of the sheet's velocity on the Marangoni number (Ma) and the surface Péclet number (Pes). For...

[Phys. Rev. E 99, 033101] Published Fri Mar 01, 2019

### Shock-wave structure according to a linear irreversible thermodynamic model

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

In this work we present a phenomenological model to look for a better understanding of the shock-wave structure in dilute monatomic gases. The model is based on the principles of linear irreversible thermodynamics, where we have been aware of the flow anisotropy caused by the shock-wave propagation....

[Phys. Rev. E 99, 023114] Published Wed Feb 27, 2019

### Effect of small inclination on binary convection in elongated rectangular cells

Author(s): Isabel Mercader, Oriol Batiste, Arantxa Alonso, and Edgar Knobloch

We analyze the effect of a small inclination on the well-studied problem of two-dimensional binary fluid convection in a horizontally extended closed rectangular box with a negative separation ratio, heated from below. The horizontal component of gravity generates a shear flow that replaces the moti...

[Phys. Rev. E 99, 023113] Published Tue Feb 26, 2019

### Exact, approximate, and hybrid treatments of viscous Rayleigh-Taylor and Richtmyer-Meshkov instabilities

Author(s): Karnig O. Mikaelian

We consider Rayleigh-Taylor and Richtmyer-Meshkov instabilities at the interface between two fluids, one or both of which may be viscous. We derive exact analytic expressions for the amplitude η(t) in the linear regime when only one of the fluids is viscous. The more general case is solved numerical...

[Phys. Rev. E 99, 023112] Published Mon Feb 25, 2019

### Experimental lateral wall boundary layer behavior of a differentially rotating split-cylinder flow

Author(s): J. O. Rodríguez-García and J. Burguete

The cylindrical wall boundary layer of a closed cylinder split in two halves at the equator is studied experimentally. When these two parts rotate in exact corotation the internal flow is essentially in solid-body rotation at the angular velocity of both halves. When a slight difference between the ...

[Phys. Rev. E 99, 023111] Published Tue Feb 19, 2019

### Dynamics of bubble-bubble interactions experiencing viscoelastic drag

Author(s): Ekaterina Zilonova, Maxim Solovchuk, and T. W. H. Sheu

The subject of the present theoretical study is the dynamics of bubble-bubble interactions in a viscoelastic medium. First, new equations for calculating the viscoelastic drag exerted on bubbles during their translational motion in a viscoelastic medium are derived. The drag equations are incorporat...

[Phys. Rev. E 99, 023109] Published Thu Feb 14, 2019

### Rotating polygonal depression soliton clusters on the inner surface of a liquid ring

Author(s): Hamid Ait Abderrahmane, Pooya Soltanian Sedeh, Hoi Dick Ng, and Georgios H. Vatistas

We report an experimental observation of rotating depression soliton sets on the inner surface of a viscous liquid ring, carrying background waves. These occur within a rotating shallow layer of oil inside a stationary cylindrical container. The solitons are organized either in single, two, or regul...

[Phys. Rev. E 99, 023110] Published Thu Feb 14, 2019

### Turbulence and jet-driven zonal flows: Secondary circulation in rotating fluids due to asymmetric forcing

Author(s): M. J. Burin, K. J. Caspary, E. M. Edlund, R. Ezeta, E. P. Gilson, H. Ji, M. McNulty, J. Squire, and G. R. Tynan

We report on experiments and modeling on a rotating confined liquid that is forced by circumferential jets coaxial with the rotation axis, wherein system-scale secondary flows are observed to emerge. The jets are evenly divided in number between inlets and outlets and have zero net mass transport. F...

[Phys. Rev. E 99, 023108] Published Tue Feb 12, 2019

### Minimum enstrophy principle for two-dimensional inviscid flows around obstacles

Author(s): F. Muller, A. Burbeau, B.-J. Gréa, and P. Sagaut

Large-scale coherent structures emerging in two-dimensional flows can be predicted from statistical physics inspired methods consisting in minimizing the global enstrophy while conserving the total energy and circulation in the Euler equations. In many situations, solid obstacles inside the domain m...

[Phys. Rev. E 99, 023105] Published Mon Feb 11, 2019

### $1/f$ noise and long-term memory of coherent structures in a turbulent shear flow

Author(s): M. Pereira, C. Gissinger, and S. Fauve

A shear flow of liquid metal (Galinstan) is driven in an annular channel by counter-rotating traveling magnetic fields imposed at the end caps. When the traveling velocities are large, the flow is turbulent and its azimuthal component displays random reversals. Power spectra of the velocity field ex...

[Phys. Rev. E 99, 023106] Published Mon Feb 11, 2019

### Shape oscillations of a nonspherical water droplet

Author(s): Mounika Balla, Manoj Kumar Tripathi, and Kirti Chandra Sahu

The dynamics of a nonspherical droplet falling in air is investigated via three-dimensional numerical simulations of the Navier-Stokes and continuity equations. The main focus of this work is to study the effects of the relative influence of surface tension force over the inertial force and the orie...

[Phys. Rev. E 99, 023107] Published Mon Feb 11, 2019

### Fluid flow through packings of elastic shells

Author(s): Pawel Gniewek and Oskar Hallatschek

Fluid transport in porous materials is commonly studied in geological samples (soil, sediments, etc.) or idealized systems, but the fluid flow through compacted granular materials, consisting of substantially strained granules, remains relatively unexplored. As a step toward filling this gap, we stu...

[Phys. Rev. E 99, 023103] Published Fri Feb 08, 2019

### Bacterial detachment from a wall with a bump line

Author(s): Jinyou Yang, Yuji Shimogonya, and Takuji Ishikawa

The interactions of bacteria with surfaces have important implications in numerous areas of research, such as bioenergy, biofilm, biofouling, and infection. Recently, several experimental studies have reported that the adhesion of bacteria can be reduced considerably by microscale wall features. To ...

[Phys. Rev. E 99, 023104] Published Fri Feb 08, 2019

### Dynamic characteristics of a deformable capsule in a simple shear flow

Author(s): Jingtao Ma, Lincheng Xu, Fang-Bao Tian, John Young, and Joseph C. S. Lai

The dynamic characteristics of a two-dimensional deformable capsule in a simple shear flow are studied with an immersed boundary-lattice Boltzmann method. Simulations are conducted by varying the Reynolds number (Re) from 0.0125 to 2000 and the dimensionless shear rate (G) from 0.001 to 0.5. The G-R...

[Phys. Rev. E 99, 023101] Published Thu Feb 07, 2019

### Cancellation exponents in isotropic turbulence and magnetohydrodynamic turbulence

Author(s): X. M. Zhai, K. R. Sreenivasan, and P. K. Yeung

Small-scale characteristics of turbulence such as velocity gradients and vorticity fluctuate rapidly in magnitude and oscillate in sign. Much work exists on the characterization of magnitude variations, but far less on sign oscillations. While in homogeneous turbulence averages performed on large sc...

[Phys. Rev. E 99, 023102] Published Thu Feb 07, 2019

### Relative importance of initial conditions on outflows from multiple fans

Author(s): K. Takamure and S. Ozono

Generation of homogeneous isotropic turbulence was attempted using an innovative “multifan wind tunnel” with 99 fans installed. The driving method used is based on a principle that the shear layers generated between outflows from the adjacent ducts lead to turbulent flow downstream. First, a signal ...

[Phys. Rev. E 99, 013112] Published Wed Jan 30, 2019

### Dynamics of bidensity particle suspensions in a horizontal rotating cylinder

Author(s): Sudarshan Konidena, K. Anki Reddy, and Anugrah Singh

We report Stokesian dynamics simulations of bidensity suspensions rotating in a horizontal cylinder. We studied the phase space and radial and axial patterns in settling as well as floating systems. Each system was composed of particle mixtures of two different densities. As many as eight unique pha...

[Phys. Rev. E 99, 013111] Published Tue Jan 29, 2019