Physical Review Fluids

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Recent articles in Physical Review Fluids
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Leading-edge flow reattachment and the lateral static stability of low-aspect-ratio rectangular wings

Mon, 11/13/2017 - 10:00

Author(s): Thomas Linehan and Kamran Mohseni

An experimental study of low-aspect-ratio rectangular wings in cross flow shows that the reorganization of vortex flow on the wing plays a key role in initiating “roll stall” at angles of attack of sustained/increasing lift.

[Phys. Rev. Fluids 2, 113901] Published Mon Nov 13, 2017

Stability analysis for $n$-periodic arrays of fluid systems

Mon, 11/13/2017 - 10:00

Author(s): Peter J. Schmid, Miguel Fosas de Pando, and N. Peake

Many fluid systems consisting of an assembly of multiple but identical elements exhibit collective and synchronized motion involving groups of locked-in units. A computational framework for this type of fluid system with examples from hydrodynamic stability and turbomachinery is presented.

[Phys. Rev. Fluids 2, 113902] Published Mon Nov 13, 2017

Comparison of forcing functions in magnetohydrodynamics

Mon, 11/13/2017 - 10:00

Author(s): Mairi E. McKay, Moritz Linkmann, Daniel Clark, Adam A. Chalupa, and Arjun Berera

Three commonly used methods of energy injection are tested in simulations of homogeneous, incompressible magnetohydrodynamic turbulence without a mean magnetic field, showing, among other things, that the cross helicity is sensitive to the forcing function.

[Phys. Rev. Fluids 2, 114604] Published Mon Nov 13, 2017

Role of viscosity coefficients during spreading and coalescence of droplets in liquids

Fri, 11/10/2017 - 10:00

Author(s): Bibin M. Jose and Thomas Cubaud

Experiments with immersed drops spreading on a surface or with two drops coalescing find that the contact diameter obeys a power law in time and in the internal and external viscosities.

[Phys. Rev. Fluids 2, 111601(R)] Published Fri Nov 10, 2017

Active elastohydrodynamics of vesicles in narrow blind constrictions

Fri, 11/10/2017 - 10:00

Author(s): T. G. Fai, R. Kusters, J. Harting, C. H. Rycroft, and L. Mahadevan

Vesicle motion through a narrow channel with fluid resistance is studied with lubrication theory and lattice Boltzman simulations. We find two dimensionless parameters that characterize the motion and that multistable dynamics, in which a vesicle may move in either direction, are possible.

[Phys. Rev. Fluids 2, 113601] Published Fri Nov 10, 2017

Minimal model for a hydrodynamic fingering instability in microroller suspensions

Fri, 11/10/2017 - 10:00

Author(s): Blaise Delmotte, Aleksandar Donev, Michelle Driscoll, and Paul Chaikin

A simple continuum model to study the fingering instability in systems of micro-particles rotating parallel to a floor is developed. Analytical results are in agreement with the simulations and experiments, and are used to extract the physical mechanisms that trigger the instability.

[Phys. Rev. Fluids 2, 114301] Published Fri Nov 10, 2017

Sustaining mechanism of small-scale turbulent eddies in a precessing sphere

Fri, 11/10/2017 - 10:00

Author(s): Yasufumi Horimoto and Susumu Goto

Laboratory experiments of turbulence of non-Newtonian fluids reveal that the fully developed turbulence of Newtonian fluids in a precessing sphere is sustained by an energy cascading process.

[Phys. Rev. Fluids 2, 114603] Published Fri Nov 10, 2017

Entrainment and scattering in microswimmer-colloid interactions

Thu, 11/09/2017 - 10:00

Author(s): Henry Shum and Julia M. Yeomans

Scattering trajectories for a swimmer interacting with a particle are simulated in Stokes flow, varying the size of the particle from much smaller than to much larger than the swimmer. The particle deflects the swimmer’s path, which can lead to a larger particle having a larger net displacement.

[Phys. Rev. Fluids 2, 113101] Published Thu Nov 09, 2017

Effects of incomplete mixing on reactive transport in flows through heterogeneous porous media

Wed, 11/08/2017 - 10:00

Author(s): Elise E. Wright, David H. Richter, and Diogo Bolster

The role of incomplete mixing through an idealized two-dimensional heterogeneous porous medium is studied using a Lagrangian reactive particle tracking method. Velocity-gradient-based flow deformation metrics are considered and connections are made to conservative transport.

[Phys. Rev. Fluids 2, 114501] Published Wed Nov 08, 2017

Generation of higher harmonic internal waves by oscillating spheroids

Tue, 11/07/2017 - 10:00

Author(s): Natalia Shmakova, Evgeny Ermanyuk, and Jan-Bert Flór

Higher harmonic internal waves are generated at wave intersections and critical points of oscillating bodies, with higher amplitudes at steeper slopes and amplitude increase due to focusing for axisymmetric bodies. The horizontal structure of the nth harmonic corresponds to multipole order 2n.

[Phys. Rev. Fluids 2, 114801] Published Tue Nov 07, 2017

Effect of helicity on the correlation time of large scales in turbulent flows

Mon, 11/06/2017 - 10:00

Author(s): Alexandre Cameron, Alexandros Alexakis, and Marc-Étienne Brachet

Kolmogorov’s theory gives predictions for the inertial scales of turbulent flows but not for the large scales. Direct numerical simulations and analytic derivation are used to investigate the spatiotemporal properties of large scales for flow solutions of Navier-Stokes and truncated Euler equations.

[Phys. Rev. Fluids 2, 114602] Published Mon Nov 06, 2017