Some aspects of contact line dynamics with applications to flow in porous materials

Stephane Zaleski, Institut Jean Le Rond ∂’Alembert, Sorbonne Université Cambridge Fluids Network - fluids-related seminars 23 May 2024 11:30am Open Plan Area, Institute for Energy and Environmental Flows, Madingley Rise CB3 0EZ Among the most difficult issues in CFD is the very wide range of scales involved in some problems. Attempts at investigating the dynamics contact line have been made coming from various theoretical and numerical frameworks, the closest to first principles being molecular dynamics, while diffuse interface methods and sharp interface methods with several variants have also been put forward. Experiments are obviously difficult. Efforts made on a number of typical cases, including plunging and withdrawing plates, a sheared droplet, sessile droplets on oscillating or accelerating substrates, menisci in nanopores and the hydrodynamics assist problem. The issues involved in nucleate boiling and accelerated sessile droplets will be addressed both from the point of view of experiments (performed by various colleagues from MIT and Tokyo University) and from the point of view of simulations. I will also show recent developments in the Basilisk code allowing to simulate contact lines on complex curved boundaries, using the immersed boundary method and an appropriate contact angle boundary condition, and inside porous media.