Physical Review Fluids

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Recent articles in Physical Review Fluids
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Rebounds of deformed cavitation bubbles

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

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

Drag enhancement and drag reduction in viscoelastic flow

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

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

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

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

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

Suppression of von Kármán vortex streets past porous rectangular cylinders

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

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

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

Quasistatic fluid-fluid displacement in porous media: Invasion-percolation through a wetting transition

Thu, 10/11/2018 - 11:00

Author(s): Bauyrzhan K. Primkulov, Stephen Talman, Keivan Khaleghi, Alireza Rangriz Shokri, Rick Chalaturnyk, Benzhong Zhao, Christopher W. MacMinn, and Ruben Juanes

We introduce an invasion-percolation model which reproduces quasistatic fluid-fluid displacement patterns in porous media under different wettability conditions. Depending on wettability, the fluid front advances through capillary invasion, cooperative filling, or corner flow.

[Phys. Rev. Fluids 3, 104001] Published Thu Oct 11, 2018

Parameter estimation for complex thermal-fluid flows using approximate Bayesian computation

Thu, 10/11/2018 - 11:00

Author(s): Jason D. Christopher, Nicholas T. Wimer, Caelan Lapointe, Torrey R. S. Hayden, Ian Grooms, Gregory B. Rieker, and Peter E. Hamlington

Approximate Bayesian Computation (ABC) is used to estimate unknown physical parameters in complex thermal-fluid flows.

[Phys. Rev. Fluids 3, 104602] Published Thu Oct 11, 2018

Permanence of large eddies in Richtmyer-Meshkov turbulence with a small Atwood number

Thu, 10/11/2018 - 11:00

Author(s): Olivier Soulard, Florian Guillois, Jérôme Griffond, Vladimir Sabelnikov, and Serge Simoëns

The existence of large scale invariants in a Richtmyer-Meshkov turbulent mixing zone with a small Atwood number is studied. The impact of these invariants on the self-similarity of the flow, on its anisotropy and mixing levels, is then discussed.

[Phys. Rev. Fluids 3, 104603] Published Thu Oct 11, 2018

Inferring flow parameters and turbulent configuration with physics-informed data assimilation and spectral nudging

Thu, 10/11/2018 - 11:00

Author(s): Patricio Clark Di Leoni, Andrea Mazzino, and Luca Biferale

A data assimilation technique called nudging is used to control the evolution of turbulence simulations. By studying the response of each simulation to the nudging, information on physical flow parameters is inferred from the data being assimilated.

[Phys. Rev. Fluids 3, 104604] Published Thu Oct 11, 2018

Three-dimensional steady and oscillatory flow in a double bifurcation airway model

Wed, 10/10/2018 - 11:00

Author(s): Sahar Jalal, Tristan Van de Moortele, Andras Nemes, Omid Amili, and Filippo Coletti

Using Magnetic Resonance Velocimetry, we investigate the steady expiratory and the oscillatory flow in a planar double bifurcation model with geometric proportions relevant to the respiratory human airways for a range of Reynolds (Re) and Womersley (Wo) numbers.

[Phys. Rev. Fluids 3, 103101] Published Wed Oct 10, 2018

Reynolds-number power-law scaling of differential molecular diffusion in turbulent nonpremixed combustion

Wed, 10/10/2018 - 11:00

Author(s): Chao Han and Haifeng Wang

A statistical analysis is conducted to provide support to a theoretical power-law scaling of the effect of differential molecular diffusion with respect to the Reynolds number in turbulent non-premixed combustion by using previously published direct number simulation data.

[Phys. Rev. Fluids 3, 103201] Published Wed Oct 10, 2018

Thermally modulated cross-stream migration of a surfactant-laden deformable drop in a Poiseuille flow

Wed, 10/10/2018 - 11:00

Author(s): Sayan Das and Suman Chakraborty

Shape deformation of a surfactant-laden droplet interacts uniquely with a given thermal field to alter its migration in the cross stream direction in response to an applied pressure gradient.

[Phys. Rev. Fluids 3, 103602] Published Wed Oct 10, 2018

Air-propelled, herringbone-textured platelets

Tue, 10/09/2018 - 11:00

Author(s): Hélène de Maleprade, Dan Soto, David Quéré, E. John Hinch, Tobias Baier, Maximilian T. Schür, and Steffen Hardt

A plate floating on a cushion of air blown through a porous substrate is set in motion when herringbone-shaped grooves redirect the airflow in a preferred direction, allowing contactless manipulation of objects.

[Phys. Rev. Fluids 3, 104101] Published Tue Oct 09, 2018

Superfluid helium-4 hydrodynamics with discrete topological defects

Mon, 10/08/2018 - 11:00

Author(s): Demosthenes Kivotides

A model of normal-fluid dynamics and its coupling with superfluid vortices is formulated. The role of axial flow instabilities of superfluid vortices in energy transfer from normal-fluid to superfluid turbulence is indicated.

[Phys. Rev. Fluids 3, 104701] Published Mon Oct 08, 2018

Spontaneous capillary propulsion of liquid droplets on substrates with nonuniform curvature

Fri, 10/05/2018 - 11:00

Author(s): P. Galatola

A liquid droplet spread on a solid substrate with nonuniform curvature, such as a conical surface, spontaneously moves. By assuming that the only source of dissipation is the contact line viscosity, we perturbatively determine the speed of the droplet and the total capillary force acting on it.

[Phys. Rev. Fluids 3, 103601] Published Fri Oct 05, 2018