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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 ...
Two–dimensional viscoplastic dambreaks
(Journal of Non-Newtonian Fluid Mechanics, 2016-12-01)
We report the results of computations for two–dimensional dambreaks of viscoplastic fluid, focusing on the phenomenology of the collapse, the mode of initial failure, and the final shape of the slump. The volume-of-fluid ...
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 ...
The Modular Aerial Sensing System
(American Meteorological SocietyJournal of Atmospheric and Oceanic Technology, 2016-06-01)
Satellite remote sensing has enabled remarkable progress in the ocean, earth, atmospheric, and environmental sciences through its ability to provide global coverage with ever-increasing spatial resolution. While exceptions ...
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, ...
The effects of an opposing buoyancy force on the performance of an air curtain in the doorway of a building
(ElsevierEnergy and Buildings, 2015-06-01)
We investigate the effects of an opposing buoyancy force on the performance of an air curtain in the doorway which separates a warm indoor environment from the cold exterior. Such an opposing buoyancy force arises for ...
First integrals of affine connections and Hamiltonian systems of hydrodynamic type
(Oxford University PressJournal of Integrable Systems, 2016-12-23)
We find necessary and sufficient conditions for a local geodesic flow of an affine connection on a surface to admit a linear first integral. The conditions are expressed in terms of two scalar invariants of differential ...