讲座时间：2026年3月28日 16:00-17:30
讲座地点：雁栖湖校区西区 教3-207
讲座题目：Flows and forces induced by the translation of a particle in a rotating or linearly stratified flow
讲座嘉宾：
Jacques Magnaudet is a Senior Researcher at CNRS, working at 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 IUTAM (International Union of Theoretical and Applied Mechanics).
讲座内容：
Physical situations involving particles moving within a fluid subjected to non-conservative forcings are commonly encountered in geophysical flows. Nevertheless, the prediction, or even the simple estimate, of the hydrodynamic forces induced on these objects by such forcings is far from being a solved problem in flow regimes of practical interest. I will present some results on this topic, based on numerical simulations addressing the case of spherical particles settling along the rotation axis of a large container or through a linear stratification. I will show how these simulations, combined with analyses of the dominant balances in the governing equations, make it possible to confirm or establish scaling laws for the forces experienced by the particles, and to specify their domains of validity.
