# Physical Review E

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### Thermally induced interfacial instabilities and pattern formation in confined liquid nanofilms

Author(s): Hadi Nazaripoor, M. R. Flynn, Charles R. Koch, and Mohtada Sadrzadeh

The dynamics, instability, and pattern formation of thermally triggered thin liquid films are investigated numerically under a long-wave limit approximation. To determine the mechanisms responsible for instability growth and pattern formation in confined heated nanofilms, acoustic phonon (AP) and th...

[Phys. Rev. E 98, 043106] Published Mon Oct 15, 2018

### Trapping of plasma enabled by pycnoclinic acoustic force

Author(s): John P. Koulakis, Seth Pree, Alexander L. F. Thornton, and Seth Putterman

Sound can hold partially ionized sulfur at the center of a spherical bulb. We use the sulfur plasma itself to drive a 180 dB re 20 μPa sound wave by periodically heating it with microwave pulses at a frequency that matches the lowest order, spherically symmetric, acoustic resonance of the bulb. To c...

[Phys. Rev. E 98, 043103] Published Fri Oct 12, 2018

### Size and shape affect swimming of a triangular bead-spring microswimmer

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

We investigate analytically the transport characteristics of the triangular bead-spring microswimmer and its dependence on the sizes of the beads as well as on the relative bead configurations. The microswimmer is composed of three beads connected by linear springs in an isosceles triangular arrange...

[Phys. Rev. E 98, 043104] Published Fri Oct 12, 2018

### Mach number effect on the instability of a planar interface subjected to a rippled shock

Author(s): Wenbin Zhang, Qiang Wu, Liyong Zou, Xianxu Zheng, Xinzhu Li, Xisheng Luo, and Juchun Ding

The Richtmyer-Meshkov (RM) instability of a planar interface (N2−SF6) subjected to a sinusoidal rippled shock, as the variant of a sinusoidal interface impinged by a planar shock, is investigated through high-order compressible multicomponent hydrodynamic simulations. The rippled shock is generated ...

[Phys. Rev. E 98, 043105] Published Fri Oct 12, 2018

### Influence of wettability on phase connectivity and electrical resistivity

Author(s): Zhishang Liu, James E. McClure, and Ryan T. Armstrong

Experimental results have shown that resistivity index can deviate from Archie's law at low conductive phase saturation. Previous works have claimed that wettability and flow history are the two main factors causing this phenomenon. Herein, we investigate how the underlying fluid morphology influenc...

[Phys. Rev. E 98, 043102] Published Mon Oct 08, 2018

### Self-assembly of a drop pattern from a two-dimensional grid of nanometric metallic filaments

Author(s): Ingrith Cuellar, Pablo D. Ravazzoli, Javier A. Diez, Alejandro G. González, Nicholas A. Roberts, Jason D. Fowlkes, Philip D. Rack, and Lou Kondic

We report experiments, modeling, and numerical simulations of the self–assembly of particle patterns obtained from a nanometric metallic square grid. Initially, nickel filaments of rectangular cross section are patterned on a SiO2 flat surface, and then they are melted by laser irradiation with ∼18-...

[Phys. Rev. E 98, 043101] Published Thu Oct 04, 2018

### Transition to turbulence scaling in Rayleigh-Bénard convection

Author(s): Jörg Schumacher, Ambrish Pandey, Victor Yakhot, and Katepalli R. Sreenivasan

If a fluid flow is driven by a weak Gaussian random force, the nonlinearity in the Navier-Stokes equations is negligibly small and the resulting velocity field obeys Gaussian statistics. Nonlinear effects become important as the driving becomes stronger and a transition occurs to turbulence with ano...

[Phys. Rev. E 98, 033120] Published Fri Sep 28, 2018

### Nonlinear thermal effects in unsteady shear flows of a rarefied gas

Author(s): Y. Ben-Ami and A. Manela

We study the response of a rarefied gas in a slab to the motion of its boundaries in the tangential direction. Different from previous investigations, we consider boundaries displacements at nonsmall Mach (Ma) numbers, coupling the dynamic and thermodynamic gas states, and deviating the system from ...

[Phys. Rev. E 98, 033121] Published Fri Sep 28, 2018

### Solutal convection in porous media: Comparison between boundary conditions of constant concentration and constant flux

Author(s): Mohammad Amin Amooie, Mohamad Reza Soltanian, and Joachim Moortgat

We numerically examine solutal convection in porous media, driven by the dissolution of carbon dioxide (CO2) into water—an effective mechanism for CO2 storage in saline aquifers. Dissolution is associated with slow diffusion of free-phase CO2 into the underlying aqueous phase followed by density-dri...

[Phys. Rev. E 98, 033118] Published Thu Sep 27, 2018

### Modeling sphere suspension microstructure and stress

Author(s): J. J. J. Gillissen and H. J. Wilson

We develop a model for the microstructure and the stress, in dense suspensions of non-Brownian, perfectly smooth spheres at vanishing particle Reynolds number. These quantities are defined in terms of the second-order moment a of the distribution function of the orientation unit vector between hydro...

[Phys. Rev. E 98, 033119] Published Thu Sep 27, 2018

### Spectral energy cascade and decay in nonlinear acoustic waves

Author(s): Prateek Gupta and Carlo Scalo

We present a numerical and theoretical investigation of the nonlinear spectral energy cascade of decaying finite-amplitude planar acoustic waves in a single-component ideal gas at standard temperature and pressure. We analyze various one-dimensional canonical flow configurations: a propagating trave...

[Phys. Rev. E 98, 033117] Published Tue Sep 25, 2018

### 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