# Physical Review E

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### Current-voltage response for unipolar funnel-shaped nanochannel diodes

Author(s): Yoav Green

Permselective nanochannels can rectify the electric current transported through them similar to solid-state diodes. The rectification is due to symmetry breaking related to distribution of the nanochannels’ surface charge as well as the geometry. Thus far, most of the works related to the asymmetric...

[Phys. Rev. E 98, 033114] Published Mon Sep 24, 2018

### Surface modes with controlled axisymmetry triggered by bubble coalescence in a high-amplitude acoustic field

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

When two bubbles encounter each other in a moderate ultrasound field they coalesce into a single bubble that shows purely spherical oscillations. For a sufficiently large acoustic field, this coalescence can lead to sustained nonspherical oscillations of the resulting bubble. We experimentally captu...

[Phys. Rev. E 98, 033115] Published Mon Sep 24, 2018

### Renormalization of viscosity in wavelet-based model of turbulence

Author(s): M. V. Altaisky, M. Hnatich, and N. E. Kaputkina

Statistical theory of turbulence in viscid incompressible fluid, described by the Navier-Stokes equation driven by random force, is reformulated in terms of scale-dependent fields ua(x), defined as wavelet-coefficients of the velocity field u taken at point x with the resolution a. Applying quantum ...

[Phys. Rev. E 98, 033116] Published Mon Sep 24, 2018

### Rolling and slipping of droplets on superhydrophobic surfaces

Author(s): A. F. W. Smith, K. Mahelona, and S. C. Hendy

The leaves of many plants are superhydrophobic, a property that may have evolved to clean the leaves by encouraging water droplets to bead up and roll off. Superhydrophobic surfaces can also exhibit reduced friction, and liquids flowing over such surfaces have been found to slip in apparent violatio...

[Phys. Rev. E 98, 033113] Published Fri Sep 21, 2018

### Large-eddy simulation of turbulent flow over spanwise-offset barchan dunes: Interdune vortex stretching drives asymmetric erosion

Author(s): Chao Wang and William Anderson

The coupling between turbulent flow physics and barchan dune geometry is important to dune migration, morphology of individual dunes, and the morphodynamics of merging and separating proximal dunes. Large-eddy simulation was used to model turbulent, inertial-dominated flow over a series of static ba...

[Phys. Rev. E 98, 033112] Published Tue Sep 18, 2018

### Enstrophy spectrum in freely decaying two-dimensional self-similar turbulent flow

Author(s): Igor Vigdorovich

We consider freely decaying two-dimensional homogeneous and isotropic turbulent motion in a self-similar limit that is achieved at large Reynolds numbers based on time and the mean kinetic energy of the flow provided that initial average enstrophy tends to infinity as fluid viscosity tens to zero. I...

[Phys. Rev. E 98, 033110] Published Mon Sep 17, 2018

### Large-eddy simulation and Reynolds-averaged Navier-Stokes modeling of a reacting Rayleigh-Taylor mixing layer in a spherical geometry

Author(s): Brandon E. Morgan, Britton J. Olson, Wolfgang J. Black, and Jacob A. McFarland

Tenth-order compact difference code *Miranda* is used to perform large-eddy simulation (LES) of a hydrogen gas–plastic mixing layer in a spherical geometry. Once the mixing layer has achieved self-similar growth, it is heated to 1 keV, and the second-order arbitrary Lagrangian-Eulerian (ALE) code *Ares*...

[Phys. Rev. E 98, 033111] Published Mon Sep 17, 2018

### Visualization and analysis of magnetothermal convection of paramagnetic liquid in the Rayleigh-Benard model

Author(s): Syou Maki, Noriyuki Hirota, and Masayuki Hagiwara

We examined the heat transfer of magnetothermal convection in a Rayleigh-Benard model (height 9.2 mm, vessel diameter 20 mm, aspect ratio 2.17). The working fluid was an aqueous gadolinium nitrate solution of 0.15 mol/kg (pH=4.52 at 305.5 K, paramagnetic substance). Not only the magnetic body force ...

[Phys. Rev. E 98, 033109] Published Wed Sep 12, 2018

### Linear stability of a contaminated fluid flow down a slippery inclined plane

Author(s): Farooq Ahmad Bhat and Arghya Samanta

The linear stability analysis of a fluid flow down a slippery inclined plane is carried out when the free surface of the fluid is contaminated by a monolayer of insoluble surfactant. The aim is to extend the earlier study [Samanta *et al.*, J. Fluid Mech. **684**, 353 (2011)] for low to high values of the...

[Phys. Rev. E 98, 033108] Published Fri Sep 07, 2018

### Axially symmetric and latitudinally propagating nonlinear patterns in rotating spherical convection

Author(s): Dali Kong, Keke Zhang, Kameng Lam, and Ashley P. Willis

We report a nonlinear phenomenon discovered in the classical problem of thermal convection in rapidly rotating, self-gravitating, internally heated Boussinesq fluid spheres. When linear convective instability (the most unstable mode of convection) is in the form of an axially symmetric, equatorially...

[Phys. Rev. E 98, 031101(R)] Published Thu Sep 06, 2018

### Turbulence-driven reverse lift on two-dimensional and three-dimensional structures

Author(s): Yaqing Jin, Lin Yan, Haotian Qiu, and Leonardo P. Chamorro

Using laboratory experiments and simplified theoretical arguments, we show that the level of turbulence may reverse the direction of the mean lift on two- and three-dimensional structures with relatively short, deflected splitters. Planar particle image velocimetry and a high-resolution load cell we...

[Phys. Rev. E 98, 033106] Published Thu Sep 06, 2018

### Long-time behavior of three-dimensional gravity-capillary solitary waves on deep water generated by a moving air-blowing forcing: Numerical study

Author(s): Yeunwoo Cho

Long-time simulations are conducted on a forced three-dimensional (3D) nonlinear viscous gravity-capillary wave equation that describes the surface wave pattern when the forcing moves on the surface of deep water with speeds less than the linear phase speed cmin=23cm/s. Three different states are id...

[Phys. Rev. E 98, 033107] Published Thu Sep 06, 2018

### Curvature dependence of heat transfer at a fluid-solid interface

Author(s): Ali Dinler, Robert W. Barber, Stefan K. Stefanov, and David R. Emerson

This study reports an opposing effect of curvature on the interfacial heat transfer, which implies a monotonic increase in the temperature jump over a convex surface and, conversely, a monotonic decrease in the temperature jump over a concave surface, as the curvature of the surface increases. The s...

[Phys. Rev. E 98, 033104] Published Wed Sep 05, 2018

### Inviscid vortex shedding model for the clap and fling motion of insect flights

Author(s): Sung-Ik Sohn

In this paper, we study the clap and fling motion of insect flights by applying an inviscid vortex shedding model. We describe separated vortices from the edges of two wings by vortex sheets and extend the model to the two bodies with symmetry. The model demonstrates sucking of leading edge vortices...

[Phys. Rev. E 98, 033105] Published Wed Sep 05, 2018

### Large-scale motions from a direct numerical simulation of a turbulent boundary layer

Author(s): Ilkay Solak and Jean-Philippe Laval

A study of large-scale motions from a direct numerical simulation database of the turbulent boundary layer up to Reθ∼2500 is presented. The statistics of large-scale streamwise structures have been investigated using two-dimensional and three-dimensional (3D) extraction procedures. The large-scale s...

[Phys. Rev. E 98, 033101] Published Tue Sep 04, 2018

### Effects of viscosity and elasticity on the Richtmyer-Meshkov instability

Author(s): Y. B. Sun, J. J. Tao, R. H. Zeng, and X. T. He

The impulsively accelerated Richtmyer-Meshkov instability (RMI) of a fluid-solid interface is theoretically studied with a decomposition method, and the least stable mode is shown to oscillate but decay due to the combined effects of elasticity and viscosity. The dispersion relation of RMI in viscou...

[Phys. Rev. E 98, 033102] Published Tue Sep 04, 2018

### Enhanced slip properties of lubricant-infused grooves

Author(s): Evgeny S. Asmolov, Tatiana V. Nizkaya, and Olga I. Vinogradova

We ascertain the enhanced slip properties for a liquid flow over lubricant-infused unidirectional surfaces. This situation reflects many practical settings involving liquid flows past superhydrophobic grooves filled with gas, or past grooves infused with another, immiscible, liquid of smaller or equ...

[Phys. Rev. E 98, 033103] Published Tue Sep 04, 2018

### Machine-learning inference of fluid variables from data using reservoir computing

Author(s): Kengo Nakai and Yoshitaka Saiki

We infer both microscopic and macroscopic behaviors of a three-dimensional chaotic fluid flow using reservoir computing. In our procedure of the inference, we assume no prior knowledge of a physical process of a fluid flow except that its behavior is complex but deterministic. We present two ways of...

[Phys. Rev. E 98, 023111] Published Fri Aug 31, 2018

### Reversals in infinite-Prandtl-number Rayleigh-Bénard convection

Author(s): Ambrish Pandey, Mahendra K. Verma, and Mustansir Barma

Using direct numerical simulations, we study the statistical properties of reversals in two-dimensional Rayleigh-Bénard convection for infinite Prandtl number. We find that the large-scale circulation reverses irregularly, with the waiting time between two consecutive genuine reversals exhibiting a ...

[Phys. Rev. E 98, 023109] Published Wed Aug 29, 2018

### Collapse of generalized Euler and surface quasigeostrophic point vortices

Author(s): Gualtiero Badin and Anna M. Barry

Point-vortex models are presented for the generalized Euler equations, which are characterized by a fractional Laplacian relation between the active scalar and the stream function. Special focus is given to the case of the surface quasigeostrophic (SQG) equations, for which the existence of finite-t...

[Phys. Rev. E 98, 023110] Published Wed Aug 29, 2018