Latest papers in fluid mechanics
Rheology of dense granular flows in two dimensions: Comparison of fully two-dimensional flows to unidirectional shear flow
Author(s): Ashish Bhateja and Devang V. Khakhar
Numerical simulations of dense granular flows in three different planar geometries find that the μ-I scaling for the local viscosity is found to be valid for each geometry, but the data for the three geometries do not collapse to a single curve.
[Phys. Rev. Fluids 3, 062301(R)] Published Fri Jun 08, 2018
Hydrodynamic bifurcation in electro-osmotically driven periodic flows
Author(s): Alexander Morozov, Davide Marenduzzo, and Ronald G. Larson
In this paper, we report an inertial instability that occurs in electro-osmotically driven channel flows. We assume that the charge motion under the influence of an externally applied electric field is confined to a small vicinity of the channel walls that, effectively, drives a bulk flow through a ...
[Phys. Rev. Fluids 3, 063702] Published Fri Jun 08, 2018
Influence of a thin compressible insoluble liquid film on the eddy currents generated by interacting surface waves
Author(s): Vladimir M. Parfenyev and Sergey S. Vergeles
Crossed surface waves generate eddy currents near the fluid surface owing to hydrodynamic nonlinearity. We studied how these currents penetrate into the fluid bulk and showed that a thin compressible insoluble liquid film presented on the fluid surface increases their intensity.
[Phys. Rev. Fluids 3, 064702] Published Fri Jun 08, 2018
Observation of the pressure effect in simulations of droplets splashing on a dry surface
Author(s): A. M. P. Boelens, A. Latka, and J. J. de Pablo
At atmospheric pressure, a droplet impacting on a surface produces a splash. Reducing the ambient pressure suppresses this splash. The pressure effect is not well understood and this is the first study to present an in-depth comparison between various theoretical splashing models and simulations.
[Phys. Rev. Fluids 3, 063602] Published Thu Jun 07, 2018
Electrohydrodynamic ionic wind, force field, and ionic mobility in a positive dc wire-to-cylinders corona discharge in air
Author(s): Nicolas Monrolin, Olivier Praud, and Franck Plouraboué
Particle image velocimetry of ionic wind produced by a positive dc corona in air is used to evaluate lift force, and results are consistent with a general theoretical expression previously found for net momentum transfer. Momentum transfer efficiency is found to be sensitive to the electrode aerodynamic wake and the electric field orientation.
[Phys. Rev. Fluids 3, 063701] Published Thu Jun 07, 2018
Numerical investigation of homogeneous cavitation nucleation in a microchannel
Author(s): Xiuxiu Lyu, Shucheng Pan, Xiangyu Hu, and Nikolaus A. Adams
With the Euler-Lagrangian coupled method we simulate homogeneous nucleation cavitation induced by shock reflection in a microchannel. Nucleation is found to occur in three stages: energy deposition, generation, and growth. Initial generation time is not found to depend strongly on shock intensity.
[Phys. Rev. Fluids 3, 064303] Published Thu Jun 07, 2018
Electrochemical wall shear rate microscopy of collapsing bubbles
Author(s): Fabian Reuter and Robert Mettin
A high-speed method for time-resolved measurements of wall shear rates providing microscopic resolution is presented. The wall shear rates produced by a single, collapsing cavitation bubble are studied.
[Phys. Rev. Fluids 3, 063601] Published Wed Jun 06, 2018
Examination of propeller sound production using large eddy simulation
Author(s): Jacob Keller, Praveen Kumar, and Krishnan Mahesh
Results of a high-fidelity large eddy simulation are used to compute the far-field sound that results from the unsteady loading of a propeller operating at design condition. High levels of unsteadiness at the blade tip account for the majority of far-field sound.
[Phys. Rev. Fluids 3, 064601] Published Wed Jun 06, 2018
Onset of chaos in helical vortex breakdown at low Reynolds number
Author(s): S. Pasche, F. Avellan, and F. Gallaire
The dynamics of the helical vortex breakdown has revealed a Ruelle-Takens-Newhouse route to chaos coming from the nonlinear interactions of pure hydrodynamic modes. Global stability analysis, Fourier series decomposition, and time series analysis have been used to shed light on the dynamical states.
[Phys. Rev. Fluids 3, 064701] Published Wed Jun 06, 2018
Edge effects on the fluttering characteristics of freely falling planar particles
Author(s): Luis Blay Esteban, John Shrimpton, and Bharathram Ganapathisubramani
Trajectories of N-sided polygons falling in quiescent media are used to measure the edge effect on the descent. A new length scale is proposed to estimate the equivalent dimensionless numbers. This allows use of the original phase diagram for disks and reconciles the effects of particle shape.
[Phys. Rev. Fluids 3, 064302] Published Tue Jun 05, 2018
Experimental investigation of the Peregrine Breather of gravity waves on finite water depth
Author(s): G. Dong, B. Liao, Y. Ma, and M. Perlin
A series of laboratory experiments were performed to study the Peregrine Breather evolution in a wave flume of finite depth and deep water. The experimental results are compared with computations based on both the nonlinear Schrödinger equation and the Dysthe equation, both with a dissipation term.
[Phys. Rev. Fluids 3, 064801] Published Mon Jun 04, 2018
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