Latest papers in fluid mechanics

Author(s): Jack-William Barotta, Giuseppe Pucci, Eli Silver, Alireza Hooshanginejad, and Daniel M. Harris

When a millimetric body is placed atop a vibrating liquid bath, the relative motion between the object and the interface generates outward-propagating waves with an associated momentum flux. Prior work has shown that isolated chiral objects, referred to as spinners, can thus rotate steadily in respo…

[Phys. Rev. E 111, 035105] Published Thu Mar 20, 2025

Author(s): Nanami Taketoshi, Toshihiro Omori, and Takuji Ishikawa

Sperm bundling, swarming, and aggregation are observed in various species, suggesting that grouping enhances motility. In this study, we developed a numerical model of sperm computed by fluid-structure interactions between multiple flagella, showing that hydrodynamic interactions allow the sperm mod…

[Phys. Rev. E 111, 035103] Published Tue Mar 18, 2025

Author(s): Nilgun Sungar, John Sharpe, Loic Ijzerman, and Jack-William Barotta

Chiral active particles are able to draw energy from the environment to self-propel in the form of rotation. We describe an experimental arrangement wherein chiral objects, spinners, floating on the surface of a vibrated fluid rotate due to emitted capillary waves. We observe that pairs of spinners …

[Phys. Rev. E 111, 035104] Published Tue Mar 18, 2025

Author(s): J. G. Wouchuk

An analytical model to study the perturbation flow that evolves between a rippled piston and a shock is presented, based on previous published work. Only the rigid piston boundary condition is considered at the piston surface driving the shock. Any time a corrugated shock is launched inside a fluid,…

[Phys. Rev. E 111, 035102] Published Tue Mar 11, 2025

Author(s): Giuseppe Pucci, Antoine Bellaigue, Alessia Cirimele, Giuseppe Alì, and Anand U. Oza

A macroscopic hydrodynamic system that couples a particle and a wave has recently renewed interest in the question as to what extent a classical system may reproduce quantum phenomena. Here we investigate single-particle diffraction with a pilot-wave model originally developed to describe the hydrod…

[Phys. Rev. E 111, L033101] Published Fri Mar 07, 2025

Author(s): J. F. Scott

Following on from previous work [J. F. Scott and C. Cambon, J. Fluid Mech. 979, A17 (2024)], this article concerns weak (small Rossby or Froude number), homogeneous turbulence subject to rotation and stable stratification. The flow is expressed as a combination of particular solutions (modes) of the…

[Phys. Rev. E 111, 035101] Published Wed Mar 05, 2025

Author(s): Alessia Ferraro, Gregory P. Chini, and T. M. Schneider

We derive a two-dimensional (2D) extension of a recently developed formalism for slow-fast quasilinear (QL) systems subject to fast instabilities. The emergent dynamics of these systems is characterized by a slow evolution of (suitably defined) mean fields coupled to marginally stable, fast fluctuat…

[Phys. Rev. E 111, 025105] Published Mon Feb 24, 2025

Author(s): G. Sanfins, F. Ramos, and D. Naiff

In this work, we introduce a neural network algorithm designed to automatically identify similarity relations from data. By uncovering these similarity relations, our network approximates the underlying physical laws that relate dimensionless quantities to their dimensionless variables and coefficie…

[Phys. Rev. E 111, 025106] Published Mon Feb 24, 2025

Author(s): Nicholas Pak, Elise Theriot, Denis Aslangil, Andrew Lawrie, and Arindam Banerjee

The dynamic properties of an interfacial flow between heavy and light incompressible fluids that are initially Rayleigh-Taylor unstable and are subjected to an external acceleration field oriented in opposition to the density gradient are studied. Rayleigh-Taylor instability occurs in nature with a …

[Phys. Rev. E 111, 025107] Published Mon Feb 24, 2025

Author(s): Thomas Burton, Sean Symon, Ati S. Sharma, and Davide Lasagna

We propose a framework for approximating the statistical properties of turbulent flows by combining variational methods for the search of unstable periodic orbits with resolvent analysis for dimensionality reduction. Traditional approaches relying on identifying all short, fundamental unstable perio…

[Phys. Rev. E 111, 025104] Published Tue Feb 18, 2025

Author(s): L. Manfredini and Ö. D. Gürcan

A class of shell models is proposed where the shell variables are defined on a recurrent sequence of integer wave numbers such as the Fibonacci or the Padovan series or their variations, including a sequence made of square roots of Fibonacci numbers rounded to the nearest integer. Considering the si…

[Phys. Rev. E 111, 025103] Published Fri Feb 14, 2025

Author(s): Khemraj Gautam Kshetri, Andrew Cook, and Nitesh Nama

We present a numerical model to study time-averaged acoustic radiation force and microstreaming around an elastic sphere immersed within an acoustically actuated viscoelastic fluid. We employ a perturbation approach to systematically identify limiting regimes where the viscoelastic fluid can be appr…

[Phys. Rev. E 111, 025102] Published Thu Feb 13, 2025

Author(s): S. Toppaladoddi and A. J. Wells

Arctic sea ice is one of the most sensitive components of the Earth’s climate system, and it is difficult to predict its evolution because of challenges in modeling the effects of the underlying ocean. The authors develop a simplified stochastic model for the turbulent heat flux from the ocean to the ice that shows good agreement with observational data.

[Phys. Rev. E 111, 025101] Published Wed Feb 12, 2025

Author(s): Arghyadeep Paul and N. R. Aluru

Electrokinetic ion transport under coupled external electric field and pressure drops has recently exhibited giant, but monotonous, mechanical amplifications of ionic current in some nanochannels. While such effects can be exploited to develop novel pressure-sensitive ionic circuits, they can also y…

[Phys. Rev. E 111, L023101] Published Fri Feb 07, 2025

Author(s): Samvit Kumar, Simon Toedtli, Tamer A. Zaki, and Gregory L. Eyink

The detailed Josephson-Anderson relation, which equates instantaneously the volume-integrated vorticity flux and the work by pressure drop, has been the key to drag reduction in superconductors and superfluids. We employ a classical version of this relation to investigate the dynamics of polymer dra…

[Phys. Rev. E 111, 015105] Published Fri Jan 24, 2025

Author(s): Henrik Kiefer, Domenico Vitali, Benjamin A. Dalton, Laura Scalfi, and Roland R. Netz

The relation between the frequency-dependent friction of a molecule in a liquid and the hydrodynamic properties of the liquid is fundamental for molecular dynamics. We investigate this connection for a water molecule moving in liquid water using all-atomistic molecular dynamics (MD) simulations and …

[Phys. Rev. E 111, 015104] Published Thu Jan 23, 2025

Author(s): S. S. Liu, Y. B. Sun, C. Wang, J. K. Shao, and J. J. Tao

In this Letter, we report on the induction of aluminum combustion within supercritical water, facilitated by an underwater explosion bubble. This bubble, initiated using an aluminum-wire electrical discharge in a water-filled tank, typically spans tens of centimeters and undergoes oscillatory dynami…

[Phys. Rev. E 111, L013101] Published Wed Jan 22, 2025

Author(s): J. Sánchez-Rodríguez and F. Gallaire

Archetypal falling behaviors of impervious objects are classified into four modes: fluttering, tumbling, steady descent, and chaotic motion. We present in this paper an experimental result of stability induced by porosity and permeability. We discover that by drilling different porosity patterns, we can avoid tumbling and chaotic behavior in plates that, due to their inertia and Reynolds values, should tumble while falling according to the regime diagram of impervious plates. Instead, the majority of the plates flutter and a few even descend steadily.

[Phys. Rev. Fluids 10, 013904] Published Tue Jan 21, 2025

Author(s): Abdelhalim Abdeldayem, Thijs Bon, Raúl Bayoán Cal, and Johan Meyers

The valley-mountain arrangement excites secondary vortices when interacting with the atmospheric boundary layer. In this paper we develop an analytical model to predict these secondary vortices in the case of thermal stratification. The model was compared to recent direct numerical simulations available in the literature which studied secondary motions in channel flow for a wide range of Reynolds and Richardson numbers. The model showed robust performance for the range of cases considered, showing error less than 5% for the temperature and below 20% for velocity in most cases.

[Phys. Rev. Fluids 10, 014605] Published Tue Jan 21, 2025

Author(s): Chenlin Zhu, Fangyuan Peng, Dingyi Pan, Zhaosheng Yu, and Zhaowu Lin

The motion of microorganisms in complex fluids stands out as a prominent subject within fluid mechanics. In our study, we utilize the fictitious domain method to investigate the locomotion of squirmers along a convex wall in Giesekus viscoelastic fluids. This study examines the influence of fluid el…

[Phys. Rev. E 111, 015103] Published Tue Jan 21, 2025