Latest papers in fluid mechanics

Spin lattices of walking droplets

Physical Review Fluids - Wed, 10/17/2018 - 11:00

Author(s): Pedro J. Sáenz, Giuseppe Pucci, Alexis Goujon, Tudor Cristea-Platon, Jörn Dunkel, and John W. M. Bush

This paper is associated with a video winner of a 2017 APS/DFD Gallery of Fluid Motion Award for work presented at the DFD Gallery of Fluid Motion. The original video is available from the Gallery of Fluid Motion, https://doi.org/10.1103/APS.DFD.2017.GFM.V0018



[Phys. Rev. Fluids 3, 100508] Published Wed Oct 17, 2018

Emergence of small scales in vortex ring collisions

Physical Review Fluids - Wed, 10/17/2018 - 11:00

Author(s): Ryan McKeown, Rodolfo Ostilla-Mónico, Alain Pumir, Michael P. Brenner, and Shmuel M. Rubinstein

This paper is associated with a video winner of a 2017 APS/DFD Gallery of Fluid Motion Award. The original video is available from the Gallery of Fluid Motion, https://doi.org/10.1103/APS.DFD.2017.GFM.V0037



[Phys. Rev. Fluids 3, 100509] Published Wed Oct 17, 2018

Coexistence of order and chaos in C major

Physical Review Fluids - Wed, 10/17/2018 - 11:00

Author(s): Paul M. Branson, M. Rayson, M. Ghisalberti, and G. N. Ivey

This paper is associated with a video winner of a 2017 APS/DFD Gallery of Fluid Motion Award. The original video is available from the Gallery of Fluid Motion, https://doi.org/10.1103/APS.DFD.2017.GFM.V0053



[Phys. Rev. Fluids 3, 100510] Published Wed Oct 17, 2018

Splash of milk streams impacting on a solid surface

Physical Review Fluids - Wed, 10/17/2018 - 11:00

Author(s): Azar Eslam-Panah and Heidi E. Reuter

This paper is associated with a poster winner of a 2017 APS/DFD Gallery of Fluid Motion Award for work presented at the DFD Gallery of Fluid Motion. The original poster is available from the Gallery of Fluid Motion, https://doi.org/10.1103/APS.DFD.2017.GFM.P0053



[Phys. Rev. Fluids 3, 100511] Published Wed Oct 17, 2018

Orthogonal and antiparallel vortex tubes and energy cascades in quantum turbulence

Physical Review Fluids - Wed, 10/17/2018 - 11:00

Author(s): Tsuyoshi Kadokura and Hiroki Saito

Numerical simulations of the Gross-Pitaevskii equation reveal that parent and child vortices tend to be orthogonal to each other in quantum turbulence. This is a manifestation of the energy cascades and may be responsible for Kolmogorov’s law in superfluids.


[Phys. Rev. Fluids 3, 104606] Published Wed Oct 17, 2018

Mixing layer instability and vorticity amplification in a creeping viscoelastic flow

Physical Review Fluids - Tue, 10/16/2018 - 11:00

Author(s): Atul Varshney and Victor Steinberg

In channel flow hindered by two widely spaced obstacles, an elastic instability of the mixing layer arises near an inflection point on nonuniform shear velocity profiles, resulting in intermittent small vortices. In elastic turbulence a growth in the averaged vorticity above the transition is found.


[Phys. Rev. Fluids 3, 103303] Published Tue Oct 16, 2018

Rebounds of deformed cavitation bubbles

Physical Review Fluids - Tue, 10/16/2018 - 11:00

Author(s): Outi Supponen, Danail Obreschkow, and Mohamed Farhat

An experimental study of the rebounding dynamics of cavitation bubbles deformed by a free surface and by variable gravity is presented. It highlights the need to consider the rebound’s sensitivity to deformation when comparing experiments with theoretical models describing multiple bubble oscillations.


[Phys. Rev. Fluids 3, 103604] Published Tue Oct 16, 2018

Threshold for discretely self-similar satellite drop formation from a retracting liquid cone

Physical Review Fluids - Tue, 10/16/2018 - 11:00

Author(s): C. Frederik Brasz, Alexis Berny, and James C. Bird

A numerical investigation of retracting conical filaments with self-similar perturbations finds that for most cone angles, the perturbation amplitude must exceed a relatively large threshold for satellite drops to form. A static stability argument predicts this critical perturbation amplitude.


[Phys. Rev. Fluids 3, 104002] Published Tue Oct 16, 2018

Thermally induced interfacial instabilities and pattern formation in confined liquid nanofilms

Physical Review E - Mon, 10/15/2018 - 11:00

Author(s): Hadi Nazaripoor, M. R. Flynn, Charles R. Koch, and Mohtada Sadrzadeh

The dynamics, instability, and pattern formation of thermally triggered thin liquid films are investigated numerically under a long-wave limit approximation. To determine the mechanisms responsible for instability growth and pattern formation in confined heated nanofilms, acoustic phonon (AP) and th...


[Phys. Rev. E 98, 043106] Published Mon Oct 15, 2018

Drag enhancement and drag reduction in viscoelastic flow

Physical Review Fluids - Mon, 10/15/2018 - 11:00

Author(s): Atul Varshney and Victor Steinberg

The effect of inertia on the stability of viscoelastic flow is investigated. Three regions in the stability diagram are identified based on fluid elasticity, and a regime of flow relaminarization is discovered for high elasticity at Re up to 10, different from known turbulent drag reduction.


[Phys. Rev. Fluids 3, 103302] Published Mon Oct 15, 2018

Flow measurements in microporous media using micro-particle image velocimetry

Physical Review Fluids - Mon, 10/15/2018 - 11:00

Author(s): Xianke Lu, Yuyuan Zhao, and David J. C. Dennis

An experimental study identifies four regimes of flow through complex microporous materials by measuring the velocity field at the pore scale. As Re is varied different pathways become effective at transporting fluid through the porous media, changing the effective permeability of the material.


[Phys. Rev. Fluids 3, 104202] Published Mon Oct 15, 2018

Universal friction law at granular solid-gas transition explains scaling of sediment transport load with excess fluid shear stress

Physical Review Fluids - Mon, 10/15/2018 - 11:00

Author(s): Thomas Pähtz and Orencio Durán

We find that the granular friction coefficient and other local quantities controlling the scaling behavior of sediment transport vary only little across all simulated transport conditions when evaluated at the interface between the solid-like granular bed and the gas-like transport layer.


[Phys. Rev. Fluids 3, 104302] Published Mon Oct 15, 2018

Erosion of unconsolidated beds by turbidity currents

Physical Review Fluids - Mon, 10/15/2018 - 11:00

Author(s): Thomas C. Halsey

Underwater turbidity currents erode and suspend granular material from underlying beds; the kinetics of this process controls overall flow dynamics. A study confirms a decades-old conjecture by Bagnold that the erosion process is driven by a balance between fluid and grain effects.


[Phys. Rev. Fluids 3, 104303] Published Mon Oct 15, 2018

Onset criteria for freely decaying isotropic turbulence

Physical Review Fluids - Mon, 10/15/2018 - 11:00

Author(s): S. R. Yoffe and W. D. McComb

A numerical simulation of freely decaying turbulence shows that the iconic curve of dimensionless dissipation against Reynolds number depends quite strongly on the choice of time at which the turbulence is assumed to have evolved from the arbitrary initial conditions.


[Phys. Rev. Fluids 3, 104605] Published Mon Oct 15, 2018

Trapping of plasma enabled by pycnoclinic acoustic force

Physical Review E - Fri, 10/12/2018 - 11:00

Author(s): John P. Koulakis, Seth Pree, Alexander L. F. Thornton, and Seth Putterman

Sound can hold partially ionized sulfur at the center of a spherical bulb. We use the sulfur plasma itself to drive a 180 dB re 20 μPa sound wave by periodically heating it with microwave pulses at a frequency that matches the lowest order, spherically symmetric, acoustic resonance of the bulb. To c...


[Phys. Rev. E 98, 043103] Published Fri Oct 12, 2018

Size and shape affect swimming of a triangular bead-spring microswimmer

Physical Review E - Fri, 10/12/2018 - 11:00

Author(s): Mohd Suhail Rizvi, Alexander Farutin, and Chaouqi Misbah

We investigate analytically the transport characteristics of the triangular bead-spring microswimmer and its dependence on the sizes of the beads as well as on the relative bead configurations. The microswimmer is composed of three beads connected by linear springs in an isosceles triangular arrange...


[Phys. Rev. E 98, 043104] Published Fri Oct 12, 2018

Mach number effect on the instability of a planar interface subjected to a rippled shock

Physical Review E - Fri, 10/12/2018 - 11:00

Author(s): Wenbin Zhang, Qiang Wu, Liyong Zou, Xianxu Zheng, Xinzhu Li, Xisheng Luo, and Juchun Ding

The Richtmyer-Meshkov (RM) instability of a planar interface (N2−SF6) subjected to a sinusoidal rippled shock, as the variant of a sinusoidal interface impinged by a planar shock, is investigated through high-order compressible multicomponent hydrodynamic simulations. The rippled shock is generated ...


[Phys. Rev. E 98, 043105] Published Fri Oct 12, 2018

Suppression of von Kármán vortex streets past porous rectangular cylinders

Physical Review Fluids - Fri, 10/12/2018 - 11:00

Author(s): P. G. Ledda, L. Siconolfi, F. Viola, F. Gallaire, and S. Camarri

The effect of the porosity and permeability on the wakes of porous rectangular cylinders is numerically studied using linear stability analyses. We show that the flow is progressively stabilized when obstacles of increased permeability are considered, up to the suppression of the vortex shedding.


[Phys. Rev. Fluids 3, 103901] Published Fri Oct 12, 2018

Time-dependent active microrheology in dilute colloidal suspensions

Physical Review Fluids - Thu, 10/11/2018 - 11:00

Author(s): Sebastian Leitmann, Suvendu Mandal, Matthias Fuchs, Antonio M. Puertas, and Thomas Franosch

An exact analytic solution is derived for the dynamic response of a probe particle in a dilute colloidal suspension exposed to a strong step force.


[Phys. Rev. Fluids 3, 103301] Published Thu Oct 11, 2018

Optimal cell transport in straight channels and networks

Physical Review Fluids - Thu, 10/11/2018 - 11:00

Author(s): Alexander Farutin, Zaiyi Shen, Gael Prado, Vassanti Audemar, Hamid Ez-Zahraouy, Abdelilah Benyoussef, Benoit Polack, Jens Harting, Petia M. Vlahovska, Thomas Podgorski, Gwennou Coupier, and Chaouqi Misbah

The optimization of the transport of suspended deformable particles in channels and networks is studied. The complexity of global optimization at the level of an entire network with channels of different lengths and diameters is highlighted, with a specific focus on blood circulation.


[Phys. Rev. Fluids 3, 103603] Published Thu Oct 11, 2018

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