Physical Review E

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Recently published articles in Phys. Rev. E in the Table of Content section "Fluid dynamics"
Updated: 2 days 12 hours ago

Evaporation and fluid flow near the boundary of a stationary dry patch

Wed, 06/22/2022 - 11:00

Author(s): Vladimir S. Ajaev and Oleg A. Kabov

We consider an isolated circular dry patch formed in an evaporating liquid layer and investigate local viscous flows in both liquid and air near the contact line which is the boundary of the dry patch. Flow patterns in the liquid deviate significantly from the predictions of single-phase models even…

[Phys. Rev. E 105, 065111] Published Wed Jun 22, 2022

Minimal nonlinear dynamical system for the interaction between vorticity waves and shear flows

Tue, 06/21/2022 - 11:00

Author(s): Erik Gengel and Eyal Heifetz

This study is a direct follow-up of the paper by Heifetz and Guha [Phys. Rev. E 100, 043105 (2019)] on a minimal nonlinear dynamical system, describing a prototype of linearized two-dimensional shear instability. In that paper, the authors describe the instability in terms of an action at a distance…

[Phys. Rev. E 105, 065109] Published Tue Jun 21, 2022

Nonequilibrium ensembles for the three-dimensional Navier-Stokes equations 

Tue, 06/21/2022 - 11:00

Author(s): G. Margazoglou, L. Biferale, M. Cencini, G. Gallavotti, and V. Lucarini

At the molecular level fluid motions are, by first principles, described by time reversible laws. On the other hand, the coarse grained macroscopic evolution is suitably described by the Navier-Stokes equations, which are inherently irreversible, due to the dissipation term. Here, a reversible versi…

[Phys. Rev. E 105, 065110] Published Tue Jun 21, 2022

Insights from a pseudospectral study of a potentially singular solution of the three-dimensional axisymmetric incompressible Euler equation

Fri, 06/17/2022 - 11:00

Author(s): Sai Swetha Venkata Kolluru, Puneet Sharma, and Rahul Pandit

We develop a Fourier-Chebyshev pseudospectral direct numerical simulation (DNS) to examine a potentially singular solution of the radially bounded, three-dimensional (3D), axisymmetric Euler equations [G. Luo and T.Y. Hou, Proc. Natl. Acad. Sci. USA 111, 12968 (2014)]. We demonstrate that (a) the ti…

[Phys. Rev. E 105, 065107] Published Fri Jun 17, 2022

Giant fluidic impedance of nanometer-sized water bridges: Shear capillary force at the nanoscale

Fri, 06/17/2022 - 11:00

Author(s): Manhee Lee, Hyouju Choi, Bongsu Kim, and Jongwoo Kim

We analytically show that the interfacial fluid's molecular dynamics of capillary bridges induces both elastic and dissipative forces to the shearing plane. Surprisingly, the nanometer-sized, liquid-solid contact line of the bridges exerts a giant “shear” force on the solid surface, which is 105 hig…

[Phys. Rev. E 105, 065108] Published Fri Jun 17, 2022

Equivalence of three thermal boundary conditions in compressible turbulent channel flows

Thu, 06/16/2022 - 11:00

Author(s): Peng Zhang (张朋), Yubin Song (宋余滨), Yilang Liu (刘溢浪), and Zhenhua Xia (夏振华)

In this paper, direct numerical simulations have been performed to explore the equivalence of different thermal boundary conditions in compressible turbulent channel flows at fixed Re=6000,Ma=1.5. Three canonical types of thermal boundary conditions will be investigated at almost equivalent setups, …

[Phys. Rev. E 105, 065106] Published Thu Jun 16, 2022

Effects of variable deceleration periods on Rayleigh-Taylor instability with acceleration reversals

Tue, 06/14/2022 - 11:00

Author(s): Denis Aslangil, Andrew G. W. Lawrie, and Arindam Banerjee

The dynamics of an interfacial flow that is initially Rayleigh-Taylor unstable but becomes statically stable for some intermediate period due to the reversal of the externally imposed acceleration field is studied. We discuss scenarios that consider both single and double-acceleration reversals. The…

[Phys. Rev. E 105, 065103] Published Tue Jun 14, 2022

Stabilization of periodically forced Hele-Shaw flows by means of a nonmonotonic viscosity profile

Tue, 06/14/2022 - 11:00

Author(s): Vicente Pérez-Muñuzuri

The onset of viscous fingering in the presence of a viscosity profile is investigated theoretically for two immiscible fluids undergoing a time-dependent injection. Here, we show that the presence of a positive viscosity gradient at the interface between both fluids stabilizes the interface facilita…

[Phys. Rev. E 105, 065104] Published Tue Jun 14, 2022

Collective behavior and hydrodynamic advantage of side-by-side self-propelled flapping foils

Tue, 06/14/2022 - 11:00

Author(s): Xuechao Liu, Kui Liu, and Haibo Huang

Fish schools and their potential hydrodynamic advantages are intriguing problems and many underlying mechanisms are unclear due to the complexity of the system, especially for large schools. Here large schools containing four, six, and eight self-propelled foils in a side-by-side configuration are n…

[Phys. Rev. E 105, 065105] Published Tue Jun 14, 2022

Dynamic scaling in rotating turbulence: A shell model study

Fri, 06/10/2022 - 11:00

Author(s): Shailendra K. Rathor, Sagar Chakraborty, and Samriddhi Sankar Ray

We investigate the scaling form of appropriate timescales extracted from time-dependent correlation functions in rotating turbulent flows. In particular, we obtain precise estimates of the dynamic exponents zp, associated with the timescales, and their relation with the more commonly measured equal-…

[Phys. Rev. E 105, L063102] Published Fri Jun 10, 2022

Efficient reinforcement learning with partial observables for fluid flow control

Wed, 06/08/2022 - 11:00

Author(s): Akira Kubo and Masaki Shimizu

Even if the trajectory in a viscous flow system stays within a low dimensional subspace in the state space, reinforcement learning (RL) requires many observables in the active control problem. This is because the observables are assumed to follow a policy-independent Markov decision process in the u…

[Phys. Rev. E 105, 065101] Published Wed Jun 08, 2022

Continuum breakdown in compressible mixing layers

Wed, 06/08/2022 - 11:00

Author(s): Vishnu Mohan, A. Sameen, Balaji Srinivasan, and Sharath S. Girimaji

Gas-kinetic simulations of rarefied and compressible mixing layers are performed to characterize continuum breakdown and the effect on the Kelvin-Helmholtz instability. The unified gas-kinetic scheme (UGKS) is used to perform the simulations at different Mach and Knudsen numbers. The UGKS stress ten…

[Phys. Rev. E 105, 065102] Published Wed Jun 08, 2022

Three-dimensional direct numerical simulation of free-surface magnetohydrodynamic wave turbulence

Wed, 06/08/2022 - 11:00

Author(s): Evgeny Kochurin, Guillaume Ricard, Nikolay Zubarev, and Eric Falcon

We report on three-dimensional direct numerical simulation of wave turbulence on the free surface of a magnetic fluid subjected to an external horizontal magnetic field. A transition from capillary-wave turbulence to anisotropic magneto-capillary wave turbulence is observed for an increasing field. …

[Phys. Rev. E 105, L063101] Published Wed Jun 08, 2022

Interparticle attraction along the direction of the pressure gradient in an acoustic standing wave

Tue, 05/31/2022 - 11:00

Author(s): Alen Pavlic, Lorenzo Ermanni, and Jürg Dual

Scattering of an acoustic wave by particles gives rise to microstreaming, as well as to acoustic radiation and interaction forces on the particles. We numerically study these steady, nonlinear phenomena for a case of two elastic spheres in a standing wave. We show that if one or both spheres are sma…

[Phys. Rev. E 105, L053101] Published Tue May 31, 2022

Exact law for compressible pressure-anisotropic magnetohydrodynamic turbulence: Toward linking energy cascade and instabilities

Fri, 05/27/2022 - 11:00

Author(s): P. Simon and F. Sahraoui

We derive an exact law for compressible pressure-anisotropic magnetohydrodynamic turbulence. For a gyrotropic pressure tensor, we study the double-adiabatic case and show the presence of new flux and source terms in the exact law, reminiscent of the plasma instability conditions due to pressure anis…

[Phys. Rev. E 105, 055111] Published Fri May 27, 2022

Theoretical framework to predict the acoustophoresis of axisymmetric irregular objects above an ultrasound transducer array

Thu, 05/26/2022 - 11:00

Author(s): Tianquan Tang and Lixi Huang

Acoustic radiation force and torque arising from wave scattering are able to translate and rotate matter without contact. However, the existing research mainly focused on manipulating simple symmetrical geometries, neglecting the significance of geometric features. For the nonspherical geometries, t…

[Phys. Rev. E 105, 055110] Published Thu May 26, 2022

Electroconvective instability near an ion-selective surface: A mesoscopic lattice Boltzmann study

Tue, 05/24/2022 - 11:00

Author(s): Yu Zhang, Yi-Mo Zhang, Kang Luo, Hong-Liang Yi, and Jian Wu

Direct numerical simulations of electroconvection instability near an ion-selective surface are conducted using a mesoscopic lattice Boltzmann method (LBM). An electrohydrodynamic model of ion transport and fluid flow is presented. We numerically solve the Poisson-Nernst-Planck equations for the ele…

[Phys. Rev. E 105, 055108] Published Tue May 24, 2022

Predicting transition from selective withdrawal to entrainment in two-fluid stratified systems

Tue, 05/24/2022 - 11:00

Author(s): Sabbir Hassan, C. Dalton McKeon, and Darryl James

Selective withdrawal is a desired phenomenon in transferring oil from large caverns in the U.S. Strategic Petroleum Reserve (SPR), because entrainment of oil at the time during withdrawal poses a risk of contaminating the environment. Motivated to understand selective withdrawal in an SPR-like orien…

[Phys. Rev. E 105, 055109] Published Tue May 24, 2022

Modulation of turbulent Rayleigh-Bénard convection under spatially harmonic heating

Mon, 05/23/2022 - 11:00

Author(s): Chao-Ben Zhao, Yi-Zhao Zhang, Bo-Fu Wang, Jian-Zhao Wu, Kai Leong Chong, and Quan Zhou

We numerically study turbulent Rayleigh-Bénard (RB) convection under spatial temperature modulation, where the bottom temperature varies sinusoidally around a mean value in space. Both two- and three-dimensional simulations are performed over the Rayleigh number range 107≤Ra≤1010 and the wave number…

[Phys. Rev. E 105, 055107] Published Mon May 23, 2022

Bifurcation analysis of two-dimensional Rayleigh-Bénard convection using deflation

Wed, 05/18/2022 - 11:00

Author(s): N. Boullé, V. Dallas, and P. E. Farrell

We perform a bifurcation analysis of the steady states of Rayleigh-Bénard convection with no-slip boundary conditions in two dimensions using a numerical method called deflated continuation. By combining this method with an initialization strategy based on the eigenmodes of the conducting state, we …

[Phys. Rev. E 105, 055106] Published Wed May 18, 2022