NEW ARTICLE
Instability and trajectories of buoyancy-driven annular disks: A numerical study
G. Corsi et al.
Phys. Rev. Fluids 9, 043907 (2024)Seed dispersal strategies exemplify the role of morphology in defining falling paths. Here, macroscopic geometry effects are systematically studied by considering trajectories of annular disks. Via linear stability analysis, we identify the stability boundary for vertical fall, with a non-monotonic behavior of the critical falling velocity with the hole size, before increasing for large holes. Nonlinear simulations confirm linear analyses and suggest strategies for annular seed release at different heights, with the emergence of paths possibly beneficial for controlled positioning or advantageous for covering large lateral distances, depending on the hole size and disk weight.
NEW ARTICLE
Extended spreading of saline droplets upon impact on a frosty surface
Hao Zeng, Feng Wang, and Chao Sun
Phys. Rev. Fluids 9, 044001 (2024)The impact and freezing process of a water droplet are studied experimentally, incorporating the presence of frost and salt. A distinct transition of the spreading dynamics is observed, altering from the well-known 1/2 inertial scaling law to a 1/10 capillary-viscous scaling law. By considering the effect of impact inertia, partial-wetting behavior, and salinity, the mechanism of this transition is elucidated, and a unified model for predicting the droplet arrested diameter is proposed.
NEW ARTICLE
Degrees of freedom and the dynamics of fully developed turbulence
Diego Donzis and Shilpa Sajeev
Phys. Rev. Fluids 9, 044605 (2024)Turbulent flows comprise a multitude of scales which make them extremely difficult to analyze and simulate. In this work, we study homogeneous isotropic turbulence using a novel approach which solves the Navier-Sokes equations on a reduced set of modes that are sampled stochastically. The complementary set are solved using trivial dynamics. This method, called Selected Eddy Simulations, is able to capture broad dynamics of turbulence with just 10% of resolved modes, suggesting the turbulence attractor may be smaller or more robust to modeling than previously thought. This result also holds promise for developing alternative low-cost numerical approaches to study turbulent flows.
NEW ARTICLE
Electrocapillary, thermocapillary, and buoyancy convection driven flows in the Melcher-Taylor experimental setup
Alexander Yu. Gelfgat and Gerrit Maik Horstmann
Phys. Rev. Fluids 9, 044101 (2024)Electrocapillary flows in a classical experiment of Melcher and Taylor are studied. The computed streamlines qualitatively represent the experimental image. With the increase of electrocapillary forcing, the main circulation localizes near a boundary with a larger electric potential. When a dielectric liquid is replaced by a poorly conducting one, the system becomes non-isothermal owing to the Joule heating, and the flow is driven also by buoyancy and thermocapillary convection. The results show that consideration of the two-phase model is mandatory. The Lippmann equation, connecting electrically induced surface tension with nonuniform surface electric potential, is numerically verified.
EDITORS' SUGGESTION
Turbulence modulation by suspended finite-sized particles: Toward physics-based multiphase subgrid modeling
S. Balachandar, C. Peng, and L.-P. Wang
Phys. Rev. Fluids 9, 044304 (2024)The presence of a dispersed phase substantially modifies small-scale turbulence. Here we present a comprehensive mechanistically based model to predict turbulence modulation, the predictions of which, compared with particle-resolved simulations and experiments, is shown.
COLLECTION
2023 Invited Papers Collection
COLLECTION
Frenkiel Award for Fluid Mechanics
NEW ARTICLE
Particle hydrodynamics in acoustic fields: Unifying acoustophoresis with streaming
Xiaokang Zhang, Jake Minten, and Bhargav Rallabandi
Phys. Rev. Fluids 9, 044303 (2024)
NEW ARTICLE
Floquet stability analysis of pulsatile flow in toroidal pipes
J. Simon Kern, Valerio Lupi, and Dan S. Henningson
Phys. Rev. Fluids 9, 043906 (2024)
NEW ARTICLE
Internally heated and fully compressible convection: Flow morphology and scaling laws
Whitney T. Powers, Evan H. Anders, and Benjamin P. Brown
Phys. Rev. Fluids 9, 043501 (2024)
EDITORS' SUGGESTION
Lagrangian coherent structures control solute dispersion in heterogeneous poroelastic media
Junhong Wu, Daniel Lester, Michael G. Trefry, and Guy Metcalfe
Phys. Rev. Fluids 9, 044501 (2024)
NEW ARTICLE
Transient energy growth in channel flow with compliant walls
Frédéric Alizard, Benoît Pier, and Smail Lebbal
Phys. Rev. Fluids 9, 043905 (2024)
NEW ARTICLE
Effects of wall conductivities on magnetoconvection in a cube
Hai-Tao Zhu, Long Chen, and Ming-Jiu Ni
Phys. Rev. Fluids 9, 043701 (2024)
EDITORS' SUGGESTION
Machine-learning-augmented domain decomposition method for near-wall turbulence modeling
Shiyu Lyu, Jiaqing Kou, and Nikolaus A. Adams
Phys. Rev. Fluids 9, 044603 (2024)
NEW ARTICLE
Transitional pressure drop in a cavitied microchannel
Yan Yan Liu et al.
Phys. Rev. Fluids 9, 044201 (2024)
NEW ARTICLE
Heat transfer and transport property contrast effects on the compressible Rayleigh-Taylor instability
Kevin Cherng, Sanjiva Lele, and Daniel Livescu
Phys. Rev. Fluids 9, 043904 (2024)
NEW ARTICLE
Passive stabilization of crossflow instabilities by a reverse lift-up effect
Jordi Casacuberta, Stefan Hickel, and Marios Kotsonis
Phys. Rev. Fluids 9, 043903 (2024)
NEW ARTICLE
Learning in two dimensions and controlling in three: Generalizable drag reduction strategies for flows past circular cylinders through deep reinforcement learning
Michail Chatzimanolakis, Pascal Weber, and Petros Koumoutsakos
Phys. Rev. Fluids 9, 043902 (2024)
NEW ARTICLE
Microcontinuum approach to multiscale modeling of multiphase reactive flow during mineral dissolution
Zhiying Liu (刘志颖) et al.
Phys. Rev. Fluids 9, 043801 (2024)
EDITORIAL
Editorial: Introduction to the 40th Annual Gallery of Fluid Motion (Indianapolis, IN, USA 2022)
November 16, 2023
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