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Synoptic-to-planetary scale wind variability enhances phytoplankton biomass at ocean fronts
(American Geophysical UnionJournal of Geophysical Research: Oceans, 2017-06-01)
In nutrient-limited conditions, phytoplankton growth at fronts is enhanced by winds, which drive upward nutrient fluxes via enhanced turbulent mixing and upwelling. Hence, depth-integrated phytoplankton biomass can be 10 ...
Conditional sampling of a high Péclet number turbulent plume and the implications for entrainment
(Cambridge University PressJournal of Fluid Mechanics, 2017-07-25)
We present simultaneous two-dimensional velocity and scalar measurements on a central vertical plane in an axisymmetric pure turbulent plume. We use an edge-detection algorithm to determine the edge of the plume, and compare ...
Efficient boundary integral solution for acoustic wave scattering by irregular surfaces
(ElsevierEngineering Analysis with Boundary Elements, 2017-10-01)
The left–right operator splitting method is studied for the efficient calculation of acoustic fields scattered by arbitrary rough surfaces. Here, the governing boundary integral is written as a sum of left- and right-going ...
Stability of three-dimensional columnar convection in a porous medium
(Cambridge University PressJournal of Fluid Mechanics, 2017-10-25)
The stability of steady convective exchange flow with a rectangular planform in an unbounded three-dimensional porous medium is explored. The base flow comprises a balance between vertical advection with amplitude A in ...
Cosmological solutions with gravitational particle production and nonzero curvature
(American Physical SocietyPhysical Review D - Particles, Fields, Gravitation and Cosmology, 2017-05-26)
In a homogeneous and isotropic universe with nonzero spatial curvature we consider the effects of gravitational particle production in the dynamics of the universe. We show that the dynamics of the universe in such a ...
Taylor's swimming sheet in a yield-stress fluid
(Cambridge University PressJournal of Fluid Mechanics, 2017-10-10)
A yield stress is added to Taylor’s (1951, Proc. Royal Soc. A, 209, 447-461) model of a two-dimensional flexible sheet swimming through a viscous fluid. Both transverse waves along the sheet, as in Taylor’s original model, ...
Tricks and tips for faster small-scale swimming: Complex fluids and elasticity
(University of CambridgeMathematicsMagdalene College, 2017-09-28)
Many cells exploit the bending or rotation of flagellar filaments in order to self-propel in
viscous fluids. Often swimming occurs in complex, nonlinear fluids, e.g. mucus. Futhermore
even in simple Newtonian fluids, if ...
Irreversible mixing by unstable periodic orbits in buoyancy dominated stratified turbulence
(Cambridge University PressJournal of Fluid Mechanics, 2017-10-26)
We consider turbulence driven by a large-scale horizontal shear in Kolmogorov flow
(i.e. with sinusoidal body forcing) and a background linear stable strati cation with buoyancy frequency $N^2_B$ imposed in the third, ...
Analytical and experimental investigation into the effects of leading-edge radius on gust-aerofoil interaction noise
(Cambridge University PressJournal of Fluid Mechanics, 2017-10-25)
This paper investigates the effects of local leading-edge geometry on unsteady aerofoil interaction noise. Analytical results are obtained by extending previous work for parabolic leading edges to leading edges of the form ...
Layer formation in horizontally forced stratified turbulence: Connecting exact coherent structures to linear instabilities
(Journal of Fluid Mechanics, 2017-12-10)
© 2017 Cambridge University Press. We consider turbulence in a stratified 'Kolmogorov' flow, driven by horizontal shear in the form of sinusoidal body forcing in the presence of an imposed background linear stable ...