Physical Review E
Experimental investigation of walking drops: Wave field and interaction with slit structures
Author(s): Clive Ellegaard and Mogens T. Levinsen
While bouncing walking silicone oil droplets (walkers) do show many quantumlike phenomena, the original, most intriguing, double-slit experiment with walkers has been shown to be an overinterpretation of data. Several experiments and numerical simulations have proven that for at least some parameter…
[Phys. Rev. E 109, 035101] Published Mon Mar 11, 2024
Numerical simulations of elastic-plastic Richtmyer-Meshkov instability of multiple interfaces
Author(s): Xiangyi Liu, Fenghui Lin, Zhiye Zhao, Nansheng Liu, and Xiyun Lu
The elastic-plastic Richtmyer-Meshkov instability of multiple interfaces is investigated by numerical simulation using a multimaterial solid mechanics algorithm based on an Eulerian framework. This Richtmyer-Meshkov instability problem is realized by a copper layer that is flanked by vacuum and a co…
[Phys. Rev. E 109, 035102] Published Mon Mar 11, 2024
Impact of hydraulic tortuosity on microporous and nanoporous media flow
Author(s): Shiwani Singh
Using two-dimensional porous structures made up of homogeneously arranged solid obstacles, we examine the effects of rarefaction on the hydraulic tortuosity in the slip and early transition flow regimes via extended lattice Boltzmann method. We observed that modification in either the obstacle's arr…
[Phys. Rev. E 109, 025106] Published Fri Feb 23, 2024
Nanoscale electrohydrodynamic ion transport: Influences of channel geometry and polarization-induced surface charges
Author(s): Arghyadeep Paul and N. R. Aluru
Electrohydrodynamic ion transport has been studied in nanotubes, nanoslits, and nanopores to mimic the advanced functionalities of biological ion channels. However, probing how the intricate interplay between the electrical and mechanical interactions affects ion conduction in asymmetric nanoconduit…
[Phys. Rev. E 109, 025105] Published Wed Feb 21, 2024
Validation of symmetry-induced high moment velocity and temperature scaling laws in a turbulent channel flow
Author(s): Francisco Alcántara-Ávila, Luis Miguel García-Raffi, Sergio Hoyas, and Martin Oberlack
The symmetry-based turbulence theory has been used to derive new scaling laws for the streamwise velocity and temperature moments of arbitrary order. For this, it has been applied to an incompressible turbulent channel flow driven by a pressure gradient with a passive scalar equation coupled in. To …
[Phys. Rev. E 109, 025104] Published Wed Feb 14, 2024
Experimental and numerical investigation of three-dimensional shock train topology with differently oriented background waves
Author(s): Dayi Wang, Ziao Wang, Juntao Chang, Lianjie Yue, Gang Wang, and Hao Chen
To better understand the three-dimensional topology of the interaction between the shock train and the background wave, the steady and dynamic characteristics of a shock train were investigated using wind-tunnel experiments and numerical simulation. A 14° wedge placed at the bottom and sidewalls was…
[Phys. Rev. E 109, 025103] Published Tue Feb 13, 2024
Near-critical behavior of the Zhong-Zhang model
Author(s): J. H. Lowenstein
The Zhong-Zhang (ZZ) model is a one-degree-of-freedom dynamical system describing the motion of an insulating plate of length d floating on the upper surface of a convecting fluid, with locking at the boundaries. In the absence of noise, the system away from the boundaries is described by linear dif…
[Phys. Rev. E 109, 025102] Published Mon Feb 05, 2024
Data-based approach for time-correlated closures of turbulence models
Author(s): J. Domingues Lemos and A. A. Mailybaev
Developed turbulent motion of fluid still lacks an analytical description despite more than a century of active research. Nowadays, phenomenological ideas are widely used in practical applications, such as small-scale closures for numerical simulations of turbulent flows. In the present paper, we us…
[Phys. Rev. E 109, 025101] Published Thu Feb 01, 2024
Reassessing the transport properties of fluids: A symbolic regression approach
Author(s): Dimitrios Angelis, Filippos Sofos, and Theodoros E. Karakasidis
The viscosity and thermal conductivity coefficients of the Lennard-Jones fluid are extracted through symbolic regression (SR) techniques from data derived from simulations at the atomic scale. This data-oriented approach provides closed form relations that achieve fine accuracy when compared to well…
[Phys. Rev. E 109, 015105] Published Thu Jan 25, 2024
Multiobjective optimization for flapping foil hydrodynamics with a multitask and multifidelity approach
Author(s): Zhangyuan Wang, Dehan Yuan, Chenglong Wu, Xu Chen, Ruipeng Li, Weicheng Cui, and Dixia Fan
We develop a multitask and multifidelity Gaussian process (MMGP) model to accurately predict and optimize the multiobjective performance of a flapping foil while minimizing the cost of high-fidelity data. Through a comparison of three kernels, we have selected and applied the spectral mixture kernel…
[Phys. Rev. E 109, 015103] Published Tue Jan 23, 2024
Fingering stabilization and adhesion force in the lifting flow with a fluid annulus
Author(s): Írio M. Coutinho, Pedro H. A. Anjos, Rafael M. Oliveira, and José A. Miranda
The lifting Hele-Shaw cell flow commonly involves the stretching of a viscous oil droplet surrounded by air, in the confined space between two parallel plates. As the upper plate is lifted, viscous fingering instabilities emerge at the air-oil interface. Such an interfacial instability phenomenon is…
[Phys. Rev. E 109, 015104] Published Tue Jan 23, 2024
Undular bore theory for the modified Korteweg–de Vries–Burgers equation
Author(s): L. F. Calazans de Brito and A. M. Kamchatnov
We consider nonlinear wave structures described by the modified Korteweg–de Vries equation, taking into account a small Burgers viscosity for the case of steplike initial conditions. The Whitham modulation equations are derived, which include the small viscosity as a perturbation. It is shown that f…
[Phys. Rev. E 109, 015102] Published Tue Jan 16, 2024
Universal scaling law for electrified sessile droplets on a lyophilic surface
Author(s): Dipin S. Pillai and Kirti Chandra Sahu
Electrified sessile droplets on solid surfaces are ubiquitous in nature as well as in several practical applications. Although the influence of electric field on pinned sessile droplets and soap bubbles has been investigated experimentally, the theoretical understanding of the stability limit of gen…
[Phys. Rev. E 109, L013101] Published Tue Jan 09, 2024
Off-lattice Boltzmann simulation of conjugate heat transfer for natural convection in two-dimensional cavities
Author(s): Kuldeep Tolia, Sai Ravi Gupta Polasanapalli, and Kameswararao Anupindi
This study addresses the inadequacy of isothermal wall conditions in predicting accurate flow features and thermal effects in multicomponent systems. A finite-difference characteristic-based off-lattice Boltzmann method (OLBM) with a source term-based conjugate heat transfer (CHT) model is utilized …
[Phys. Rev. E 109, 015101] Published Wed Jan 03, 2024
Effect of layer thickness for the bounce of a particle settling through a density transition layer
Author(s): Shuhong Wang, Jiadong Wang, and Jian Deng
We study numerically a spherical particle settling through a density transition layer at moderate Reynolds numbers Reu=69∼259 for the upper fluid. We investigate how the transition layer thickness affects the particle's bouncing behavior as it crosses the interface. The previous intuitive understand…
[Phys. Rev. E 108, 065108] Published Thu Dec 28, 2023
Vorticity wave interaction, Krein collision, and exceptional points in shear flow instabilities
Author(s): Cong Meng and Zhibin Guo
We relate the model of vorticity wave interaction to Krein collision, PT-symmetry breaking, and the formation of exceptional points in shear flow instabilities. We show that the dynamical system of coupled vorticity waves is a pseudo-Hermitian system with nonreciprocal coupling terms. Krein signatur…
[Phys. Rev. E 108, 065109] Published Thu Dec 28, 2023
Unified description over time of heterogeneous condensation with quenched disorder
Author(s): Ruddy Urbina and Wenceslao González-Viñas
We report experimental results on breath figures (BFs) observed on substrates with quenched disorder. The evolution of BFs is found to be primarily influenced by global parameters associated with boundary conditions. We investigate classical statistical measures and explore topological properties us…
[Phys. Rev. E 108, 065107] Published Wed Dec 27, 2023
Inertial migration of spherical and oblate particles in a triangular microchannel
Author(s): Junqi Xiong, Xuechao Liu, Huiyong Feng, and Haibo Huang
The. inertial migration of both spherical and oblate particles within an equilateral triangular channel is studied numerically. Our study primarily focuses on the effects of fluid inertia, quantified by the Reynolds number (Re) and particle size (β). Our observations reveal two distinct equilibrium …
[Phys. Rev. E 108, 065105] Published Mon Dec 11, 2023
Modeling flow of Carreau fluids in porous media
Author(s): Christopher A. Bowers and Cass T. Miller
Carreau fluids occur routinely in porous medium systems for a range of applications, and the dependence of the viscosity for such fluids on the rate of strain tensor poses challenges to modeling at an averaged macroscale. Traditional approaches for macroscale modeling such flows have relied upon exp…
[Phys. Rev. E 108, 065106] Published Mon Dec 11, 2023
$H$-theorem and boundary conditions for two-temperature model: Application to wave propagation and heat transfer in polyatomic gases
Author(s): Anil Kumar and Anirudh Singh Rana
Polyatomic gases find numerous applications across various scientific and technological fields, necessitating a quantitative understanding of their behavior in nonequilibrium conditions. In this study, we investigate the behavior of rarefied polyatomic gases, particularly focusing on heat transfer a…
[Phys. Rev. E 108, 065103] Published Thu Dec 07, 2023