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On the meaning of mixing efficiency for buoyancy driven mixing in stratified turbulent flows
(Cambridge University PressJournal of Fluid Mechanics, 2015-09-17)
The concept of a mixing efficiency is widely used to relate the amount of irreversible diabatic mixing in a stratified flow to the amount of energy available to support mixing. This common measure of mixing in a flow is ...
Inclined gravity currents filling basins: The influence of Reynolds number on entrainment into gravity currents
(AIPPhysics of Fluids, 2015-09-17)
Gravity currents of dense fluid feed basins in many important natural and industrial systems, such as lakes fed by dense rivers and auditoria supplied with cooled air by ventilation systems. The entrainment into these ...
Geometric capture and escape of a microswimmer colliding with an obstacle
(Royal Society of ChemistrySoft Matter, 2015-03-09)
Motivated by recent experiments, we consider the hydrodynamic capture of a microswimmer near a stationary spherical obstacle.
Simulations of model equations show that a swimmer approaching a small spherical colloid is ...
A multi-timescale analysis of phase transitions in precessing black-hole binaries
(APSPhysical Review D, 2015-09-14)
The dynamics of precessing binary black holes (BBHs) in the post-Newtonian regime has a strong timescale hierarchy: the orbital timescale is very short compared to the spin-precession timescale which, in turn, is much ...
Geometric pumping in autophoretic channels
(Royal Society of ChemistrySoft Matter, 2015-05-07)
Many microfluidic devices use macroscopic pressure differentials to overcome viscous friction and generate flows in microchannels.
In this work, we investigate how the chemical and geometric properties of the channel walls ...
Light Sparticles from a Light Singlet in Gauge Mediation
(APSPhysics Review D, 2015-07-10)
We revisit a simple model that combines minimal gauge mediation and the next-to-minimal supersymmetric standard model. We show that one can obtain a 125 GeV Standard Model-likeHiggs boson with stops as light as 1.1 TeV, ...
Dependence on aspect ratio of symmetry breaking for oscillating foils: implications for flapping flight
(Cambridge University PressJournal of Fluid Mechanics, 2015-12-07)
Using two-dimensional direct numerical simulations, we investigate the flow in a fluid of kinematic viscosity ν and density ρ around elliptical foils of density ρ_s with major axis c and minor axis b for three different ...
Estimating the location and size of retinal injections from orthogonal images of an intact retina
(BioMed CentralBMC Neuroscience, 2015-11-21)
Background :
To study the mapping from the retina to the brain, typically a small region of the retina is injected with a dye, which then propagates to the retina's target structures. To determine the location of the ...
Coupled ππ, KK̅ scattering in P-wave and the ρ resonance from lattice QCD
(APSPhysical Review D, 2015-11-02)
We determine elastic and coupled-channel amplitudes for isospin-1 meson-meson scattering in P-wave, by calculating correlation functions using lattice QCD with light quark masses such that m_π = 236 MeV in a cubic volume ...
Graviton time delay and a speed limit for small black holes in Einstein-Gauss-Bonnet theory
(SpringerJournal of High Energy Physics, 2015-11-17)
Camanho, Edelstein, Maldacena and Zhiboedov have shown that gravitons can experience a negative Shapiro time delay, i.e. a time advance, in Einstein-Gauss-Bonnet theory. They studied gravitons propagating in singular ...