Physical Review E
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