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A two-fluid model for locomotion under self-confinement
(American Physical SocietyPhysical Review Fluids, 2017-09-01)
The bacterium Helicobacter pylori causes ulcers in the stomach of humans by invading mucus layers protecting epithelial cells. It does so by chemically changing the rheological properties of the mucus from a high-viscosity ...
A Yellow Polariton Condensate in a Dye Filled Microcavity
(WileyAdvanced Optical Materials, 2017-09-18)
Polariton condensation in the yellow part of the visible spectrum from a planar organic semiconductor microcavity containing the molecular dye bromine-substituted boron-dipyrromethene is observed. This study provides ...
Light-induced self-assembly of active rectification devices.
(Science advances, 2016-04)
Phoretic Interactions Generically Induce Dynamic Clusters and Wave Patterns in Active Colloids.
(Physical review letters, 2017-06-28)
We introduce a representative minimal model for phoretically interacting active colloids. Combining kinetic theory, linear stability analyses, and a general relation between self-propulsion and phoretic interactions in ...
Scattering of biflagellate micro-swimmers from surfaces
(American Physics SocietyPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics, 2017-08-10)
We use a three-bead-spring model to investigate the dynamics of bi-flagellate micro-swimmers near a surface. While the primary dynamics and scattering are governed by geometric-dependent direct contact, the fluid flows ...
Aspects of fluid dynamics and the fluid/gravity correspondence
(University of CambridgeDAMTPTrinity, 2017-09-01)
This thesis considers various extensions to the fluid/gravity correspondence as well as problems fundamental to the study of fluid dynamics. The fluid/gravity correspondence is a map between the solutions of the Navier-Stokes ...
Adjoint-based optimization of displacement ventilation flow
(ElsevierBuilding and Environment, 2017-11-01)
We demonstrate the use of the ‘Direct-Adjoint-Looping method’ for the identification of optimal buoyancy-driven ventilation flows governed by Boussinesq equations. We use the incompressible Reynolds-averaged Navier-Stokes ...
A two-zone model for natural cross-ventilation
(ElsevierBuilding and Environment, 2015-07-01)
Cross-ventilation flows (CV) are characterized by significant inflow momentum conservation as fluid flows across an enclosed rectangular volume as a confined jet. When the inflow area is smaller than the volume cross-sectional ...
Gravity current propagation up a valley
(Cambridge University PressJournal of Fluid Mechanics, 2015-01-10)
The advance of the front of a dense gravity current propagating in a rectangular channel and V-shaped valley both horizontally and up a low slope is examined through theory, full-depth lock-release laboratory experiments ...
Sea-ice thermodynamics and brine drainage
(Royal Society PublishingPhilosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2015-07-13)
Significant changes in the state of the Arctic ice cover are occurring. As the summertime extent of sea ice diminishes, the Arctic is increasingly characterized by first-year rather than multi-year ice. It is during the ...