My research is in interdisciplinary fluid dynamics, and I specialise in the interaction of fluids with solid bodies; in particular, those that lead to counter-intuitive flow phenomena and the formation of coherent flow structures. There are three overarching themes to my research: Interfacial and multiphase flows, biological flows, and wave-structure interaction. My research is characterised by my use of analytical, numerical, and physical modelling, and my award-winning research includes papers on liquid drops that climb uphill against gravity, bubbles in beer that sink, and the incredibly efficient flight mechanisms of small seeds.
Interfacial and multiphase flows
When two or more phases meet, the resulting interface forms a capillary surface such a bubble, drop, or liquid bridge. My research on drops and liquid bridges focuses on the effect of the contact line (the curve forming the triple fluid-gas-solid interface) on the dynamics of the capillary surface. My research on bubbles explores the dynamics of bubbles in buoyancy-driven flows.
Evolution finds ingenious ways to achieve locomotion through fluids at a wide range of Reynolds numbers (Re): from corkscrewing spermatozoa to the auto-rotation of maple seeds. My research focuses on the interplay between low- and intermediate-Re regimes, where I aim to uncover the convergent hydrodynamic strategies to propulsion that nature has evolved. My research on the flight of lightweight seeds uses analytical (boundary integral methods), numerical (direct numerical simulations), and physical modelling (wind tunnel tests) to uncover their incredibly efficient flight mechanism. My groundbreaking research revealed an entirely new class of vortex, which enhances the flight capacity of the seed.
Wave energy is one of the most promising technologies to tackle the energy ``grand challenges'' facing the planet. My research in wave energy focuses on the hydrodynamics of Wave Energy Converters (WECs). Simplified hydrodynamic models (Boundary Element Methods, BEMs) are currently used to model the dynamics of WECs. However, this approach neglects viscous effects, and overestimates the power capture of WECs, particularly in resonant conditions. By including the effects of viscosity in BEMs, my research leads the way forward for the modelling of WECs, giving realistic power prediction, without the need for CFD.