Latest papers in fluid mechanics

Active elastohydrodynamics of vesicles in narrow blind constrictions

Physical Review Fluids - 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

Physical Review Fluids - 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

Physical Review Fluids - 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

Interaction of a planar reacting shock wave with an isotropic turbulent vorticity field

Physical Review E - Thu, 11/09/2017 - 10:00

Author(s): César Huete, Tai Jin, Daniel Martínez-Ruiz, and Kun Luo

Linear interaction analysis (LIA) is employed to investigate the interaction of reactive and nonreactive shock waves with isotropic vortical turbulence. The analysis is carried out, through Laplace-transform technique, accounting for long-time effects of vortical disturbances on the burnt-gas flow i...

[Phys. Rev. E 96, 053104] Published Thu Nov 09, 2017

Entrainment and scattering in microswimmer-colloid interactions

Physical Review Fluids - 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

Physical Review Fluids - 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

Physical Review Fluids - 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

Instabilities of an annulus flow between rotating cylinders in a helical magnetic field

Physical Review E - Mon, 11/06/2017 - 10:00

Author(s): Yurong Zhao, Jianjun Tao, and Xiangming Xiong

The stabilities of an annulus flow between the rotating inner and outer cylinders with an external helical magnetic field are studied by using the quasistatic approximation. It is shown numerically that for the spiral base flow with a zero axial pressure gradient, the helical magnetic field yields a...

[Phys. Rev. E 96, 053101] Published Mon Nov 06, 2017

Flow instabilities due to the interfacial formation of surfactant–fatty acid material in a Hele-Shaw cell

Physical Review E - Mon, 11/06/2017 - 10:00

Author(s): Zahra Niroobakhsh, Matthew Litman, and Andrew Belmonte

We present an experimental study of pattern formation during the penetration of an aqueous surfactant solution into a liquid fatty acid in a Hele-Shaw cell. When a solution of the cationic surfactant cetylpyridinium chloride is injected into oleic acid, a wide variety of fingering patterns are obser...

[Phys. Rev. E 96, 053102] Published Mon Nov 06, 2017

Numerical design of a T-shaped microfluidic device for deformability-based separation of elastic capsules and soft beads

Physical Review E - Mon, 11/06/2017 - 10:00

Author(s): M. M. Villone, M. Trofa, M. A. Hulsen, and P. L. Maffettone

We propose a square cross-section microfluidic channel with an orthogonal side branch (asymmetric T-shaped bifurcation) for the separation of elastic capsules and soft beads suspended in a Newtonian liquid on the basis of their mechanical properties. The design is performed through three-dimensional...

[Phys. Rev. E 96, 053103] Published Mon Nov 06, 2017

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

Physical Review Fluids - 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


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