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Multiple instability of layered stratifed plane Couette flow
(Cambridge University PressJournal of Fluid Mechanics, 2017-02-25)
We present the linear stability properties and nonlinear evolution of two-dimensional plane Couette flow for a statically stable Boussinesq three-layer fluid of total depth 2$h$ between two horizontal plates driven at ...
Viscous effects on the acoustics and stability of a shear layer over an impedance wall
(Cambridge University PressJournal of Fluid Mechanics, 2017-01-01)
The effect of viscosity and thermal conduction on the acoustics in a shear layer above an impedance wall is investigated numerically and asymptotically by solving the linearised compressible Navier–Stokes equations (LNSE). ...
On dust–gas gravitational instabilities in protoplanetary discs
(Oxford University PressMonthly Notices of the Royal Astronomical Society, 2017-01-11)
In protoplanetary discs the aerodynamical friction between particles and gas induces a variety of instabilities that facilitate planet formation. Of these we examine the so-called ‘secular gravitational instability’ (SGI) ...
Bioinspired trailing-edge noise control
(American Institute of Aeronautics and AstronauticsAIAA Journal, 2017-01-01)
Strategies for trailing edge noise control have been inspired by the downy canopy that covers the surface of exposed flight feathers of many owl species. Previous wind tunnel measurements demonstrate that canopies of similar ...
Low- and high-frequency oscillatory winds synergistically enhance nutrient entrainment and phytoplankton at fronts
(AGU PublicationsJournal of Geophysical Research: Oceans, 2017-02-10)
When phytoplankton growth is limited by low nutrient concentrations, full-depth-integrated phytoplankton biomass increases in response to intermittent mixing events that bring nutrient-rich waters into the sunlit surface ...
Viscoplastic boundary layers
(Cambridge University PressJournal of Fluid Mechanics, 2017-02-25)
In the limit of a large yield stress, or equivalently at the initiation of motion, viscoplastic flows can develop narrow boundary layers that provide either surfaces of failure between rigid plugs, the lubrication between ...
Nonthermal fixed points in quantum field theory beyond the weak-coupling limit
(American Physical SocietyPhysical Review D - Particles, Fields, Gravitation and Cosmology, 2017-02-22)
Quantum systems in extreme conditions can exhibit universal behavior far from equilibrium associated to nonthermal fixed points with a wide range of topical applications from early-Universe inflaton dynamics and heavy-ion ...
Geometric tuning of self-propulsion for Janus catalytic particles
(Nature Publishing GroupScientific Reports, 2017-02-13)
Catalytic swimmers have attracted much attention as alternatives to biological systems for examining collective microscopic dynamics and the response to physico-chemical signals. Yet, understanding and predicting even the ...
Dynamical symmetries in Brans-Dicke cosmology
(American Physical SocietyPhysical Review D, 2017-01-20)
In the context of generalized Brans-Dicke cosmology we use the Killing tensors of the minisuperspace in order to determine the unspecified potential of a scalar-tensor gravity theory. Specifically, based on the existence ...
Mathematical imaging methods for mitosis analysis in live-cell phase contrast microscopy
(ElsevierMethods, 2017-02-15)
In this paper we propose a workflow to detect and track mitotic cells in time-lapse microscopy image sequences. In order to avoid the requirement for cell lines expressing fluorescent markers and the associated phototoxicity, ...