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 18 hours ago

Drag reduction of three-dimensional bodies by base blowing with various gas densities

Tue, 07/07/2020 - 11:00

Author(s): M. Lorite-Díez, J. I. Jiménez-González, L. Pastur, O. Cadot, and C. Martínez-Bazán

This study reveals that injecting a light fluid of density ρb in the recirculating bubble of a bluff body at Re≈6.4×104 has a greater drag reduction potential than blowing fluid of a density greater than or equal to that of the free stream ρ. It is found that the maximum drag reduction scales as (ρb...

[Phys. Rev. E 102, 011101(R)] Published Tue Jul 07, 2020

Numerical study of heat transfer in Rayleigh-Bénard convection under rarefied gas conditions

Tue, 07/07/2020 - 11:00

Author(s): B. Goshayeshi, G. Di Staso, F. Toschi, and H. J. H. Clercx

The focus of this research is to delineate the thermal behavior of a rarefied monatomic gas confined between horizontal hot and cold walls, physically known as rarefied Rayleigh-Bénard (RB) convection. Convection in a rarefied gas appears only for high temperature differences between the horizontal ...

[Phys. Rev. E 102, 013102] Published Tue Jul 07, 2020

How boundary slip controls emergent Darcy flow of liquids in tortuous and in capillary pores

Mon, 07/06/2020 - 11:00

Author(s): Kuldeep Singh

Fundamental investigations of how boundary slip relative to the no-slip condition for liquid flow in a set of two distinct idealized pore geometries, i.e., a diverging-converging tortuous pore, in contrast to a straight tube capillary pore, contribute to emergent Darcy flow and flow enhancement are ...

[Phys. Rev. E 102, 013101] Published Mon Jul 06, 2020

Squirming in a viscous fluid enclosed by a Brinkman medium

Tue, 06/30/2020 - 11:00

Author(s): Herve Nganguia, Lailai Zhu, D. Palaniappan, and On Shun Pak

Cell motility plays important roles in a range of biological processes, such as reproduction and infections. Studies have hypothesized that the ulcer-causing bacterium Helicobacter pylori invades the gastric mucus layer lining the stomach by locally turning nearby gel into sol, thereby enhancing its...

[Phys. Rev. E 101, 063105] Published Tue Jun 30, 2020

Decomposing thermal fluctuations with hydrodynamic modes

Mon, 06/22/2020 - 11:00

Author(s): Xiaohui Deng, Xiaoyu Wei, Xiaoping Wang, and Ping Sheng

We have obtained analytically the complete set of hydrodynamic modes (HMs) for a two-dimensional (2D) fluid confined within a channel with the Navier slip boundary condition at the hydrodynamic boundary. The HMs are orthogonal to each other and hence each represents an independent degree of freedom....

[Phys. Rev. E 101, 063104] Published Mon Jun 22, 2020

Multiple eigenmodes of the Rayleigh-Taylor instability observed for a fluid interface with smoothly varying density. III. Excitation and nonlinear evolution

Fri, 06/19/2020 - 11:00

Author(s): Zhengfeng Fan and Ming Dong

A compressible Rayleigh-Taylor (RT) unstable flow with a diffuse interface where the density varies smoothly supports a multiplicity of unstable eigenmodes that grow exponentially in time. This paper studies two relevant problems in a two-dimensional (2-D) RT flow by use of multimode decomposition. ...

[Phys. Rev. E 101, 063103] Published Fri Jun 19, 2020

Large deviations, singularity, and lognormality of energy dissipation in turbulence

Mon, 06/08/2020 - 11:00

Author(s): Itzhak Fouxon and Changhoon Lee

We study implications of the assumption of power-law dependence of moments of energy dissipation in turbulence on the Reynolds number Re, holding due to intermittency. We demonstrate that at Re→∞ the dissipation's logarithm divided by lnRe converges with probability one to a negative constant. This ...

[Phys. Rev. E 101, 061101(R)] Published Mon Jun 08, 2020

Stationary scaling in small-scale turbulent dynamo problem

Fri, 06/05/2020 - 11:00

Author(s): A. V. Kopyev, A. S. Il'yn, V. A. Sirota, and K. P. Zybin

We consider forced small-scale magnetic field advected by an isotropic turbulent flow. The random driving force is assumed to be distributed in a finite region with a scale smaller than the viscous scale of the flow. The two-point correlator is shown to have a stationary limit for any reasonable vel...

[Phys. Rev. E 101, 063102] Published Fri Jun 05, 2020

Harnessing random low Reynolds number flow for net migration

Wed, 06/03/2020 - 11:00

Author(s): Takeru Morita, Toshihiro Omori, Yohei Nakayama, Shoichi Toyabe, and Takuji Ishikawa

Random noise in low Reynolds number flow has rarely been used to obtain net migration of microscale objects. In this study, we numerically show that net migration of a microscale object can be extracted from random directional fluid forces in Stokes flow, by introducing deformability and inhomogeneo...

[Phys. Rev. E 101, 063101] Published Wed Jun 03, 2020

Viscous Rayleigh-Taylor and Richtmyer-Meshkov instabilities in the presence of a horizontal magnetic field

Thu, 05/28/2020 - 11:00

Author(s): Y. B. Sun and C. Wang

We first derive the exact dispersion relation for viscous Rayleigh-Taylor instability in the presence of a horizontal magnetic field using a decomposition method, and we find that the horizontal magnetic field contributes to the generation of vorticity inside the flow, thereby further distorting the...

[Phys. Rev. E 101, 053110] Published Thu May 28, 2020

Physical topology of three-dimensional unsteady flows with spheroidal invariant surfaces

Wed, 05/27/2020 - 11:00

Author(s): P. S. Contreras, M. F. M. Speetjens, and H. J. H. Clercx

Scope is the response of Lagrangian flow topologies of three-dimensional time-periodic flows consisting of spheroidal invariant surfaces to perturbation. Such invariant surfaces generically accommodate nonintegrable Hamiltonian dynamics and, in consequence, intrasurface topologies composed of island...

[Phys. Rev. E 101, 053109] Published Wed May 27, 2020

Effect of slip on the contact-line instability of a thin liquid film flowing down a cylinder

Fri, 05/22/2020 - 11:00

Author(s): Chicheng Ma, Jianlin Liu, Mingyu Shao, Bo Li, Lei Li, and Zhangna Xue

Liquid coating films on solid surfaces exist widely in a plethora of industrial processes. In this study, we focus on the falling of a liquid film on the side surface of a vertical cylinder, where the surface is viewed as slippery, such as a liquid-infused surface. The evolution profiles and flow in...

[Phys. Rev. E 101, 053108] Published Fri May 22, 2020

Influence of dielectrical heating on convective flow in a radial force field

Thu, 05/21/2020 - 11:00

Author(s): Vadim Travnikov, Florian Zaussinger, Peter Haun, and Christoph Egbers

We present results of numerical and experimental investigations of thermal convection induced by internal heating in both a nonrotating and a rotating spherical gap filled with dielectric fluid. The inner and outer surfaces are maintained at constant temperatures Tin and Tout, respectively. A radial...

[Phys. Rev. E 101, 053106] Published Thu May 21, 2020

Numerical study of droplet impact on a flexible substrate

Thu, 05/21/2020 - 11:00

Author(s): Yongfeng Xiong, Haibo Huang, and Xi-Yun Lu

Droplets interacting with deformable moving boundaries is ubiquitous. The flexible boundaries may dramatically affect the hydrodynamic behavior of droplets. A numerical method for simulating droplet impact on flexible substrates is developed. The effect of flexibility is investigated. To reduce the ...

[Phys. Rev. E 101, 053107] Published Thu May 21, 2020

Streaming-potential-mediated pressure-driven transport of Phan-Thien–Tanner fluids in a microchannel

Mon, 05/18/2020 - 11:00

Author(s): Sandip Sarkar

Streaming potential mediated pressure driven electrokinetic transport of Phan-Thien–Tanner fluids in a slit type parallel plate microchannel is studied analytically and semianalytically. Without adopting the traditional considerations of Debye–Hückel linearization approximation for low surface poten...

[Phys. Rev. E 101, 053104] Published Mon May 18, 2020

Elastoinertial chains in a two-dimensional turbulent flow

Mon, 05/18/2020 - 11:00

Author(s): Rahul Singh, Mohit Gupta, Jason R. Picardo, Dario Vincenzi, and Samriddhi Sankar Ray

The interplay of inertia and elasticity is shown to have a significant impact on the transport of filamentary objects, modeled by bead-spring chains, in a two-dimensional turbulent flow. We show how elastic interactions among inertial beads result in a nontrivial sampling of the flow, ranging from e...

[Phys. Rev. E 101, 053105] Published Mon May 18, 2020

Logarithmic and nonlogarithmic scaling laws of two-point statistics in wall turbulence

Thu, 05/14/2020 - 11:00

Author(s): Hideaki Mouri, Takeshi Morinaga, Toshimasa Yagi, and Kazuyasu Mori

Wall turbulence has a sublayer where one-point statistics, e.g., the mean velocity and the variances of some velocity fluctuations, vary logarithmically with the distance from the wall. This logarithmic scaling is found here for two-point statistics or specifically two-point cumulants of those fluct...

[Phys. Rev. E 101, 053103] Published Thu May 14, 2020

Unsteady motion of a perfectly slipping sphere

Wed, 05/13/2020 - 11:00

Author(s): Jason K. Kabarowski and Aditya S. Khair

An integral expression for the translational velocity of a perfectly slipping spherical particle under a time-dependent applied force in unsteady Stokes flow is derived. For example, when the ratio of particle density to fluid density is small, our analysis pertains to an inviscid bubble in a viscou...

[Phys. Rev. E 101, 053102] Published Wed May 13, 2020

Scale invariance of the homentropic inviscid Euler equations with application to the Noh problem

Tue, 05/12/2020 - 11:00

Author(s): Jesse F. Giron, Scott D. Ramsey, and Roy S. Baty

We investigate the inviscid compressible flow (Euler) equations constrained by an “isentropic” equation of state (EOS), whose functional form in pressure is an arbitrary function of density alone. Under the aforementioned condition, we interrogate using symmetry methods the scale-invariance of the h...

[Phys. Rev. E 101, 053101] Published Tue May 12, 2020

Evolution of Rayleigh-Taylor instability under interface discontinuous acceleration induced by radiation

Thu, 04/30/2020 - 11:00

Author(s): Ze-Xi Hu, You-sheng Zhang, and Bao-lin Tian

Rayleigh-Taylor instability (RTI) under radiation background is commonly found in both engineering applications and natural phenomena. In the optically thin and incompressible limit, the corresponding problem can be simplified as an interface discontinuous acceleration (IDA) RTI problem, but to date...

[Phys. Rev. E 101, 043115] Published Thu Apr 30, 2020