报告摘要：

Under certain conditions, a drop of oil deposited on the surface of a water layer can alternately expand and retract. I'll describe such a behavior observed with a drop of dichloromethane in the presence of a specific surface-active agent. I will explain the main hydrodynamic mechanisms that have been identified in this system, in particular those that contribute to the formation of successive rings of beads at the periphery of the droplet and the fragmentation of these remarkable structures, as well as the development of surface instabilities leading to the appearance of a star-like pattern around the drop.

报告人简介：

Jacques Magnaudet is a Senior Researcher at the French National Center for Scientific Research (CNRS), working at the Fluid Mechanics Institute of Toulouse (IMFT) in Toulouse, France. His research focuses on several aspects of hydrodynamics and turbulence in two-phase flows and inhomogeneous fluids. He has long been fascinated by the complex motion of rigid and deformable objects in fluids, be they particles, drops, bubbles or living organisms. Using or developing asymptotic models, numerical codes and simple experiments, he has contributed at a better understanding of the hydrodynamic loads acting on these bodies when they move in non-uniform or time-dependent flows, and at elucidating the entangled mechanisms leading to their path instability when their motion is gravity- or buoyancy-driven. He is an associate editor of the Journal of Fluid Mechanics and currently serves as President of International Union of Theoretical and Applied Mechanics (IUTAM).

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