Latest papers in fluid mechanics
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
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
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
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
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
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
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
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
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
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
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