December 9, 2019: Fluid-Structure Interactions and Maritime Applications
- December 9, 2019
- 4:00 p.m.
- 210 Robeson Hall
- Dr. Julie Young, University of Michigan
- Faculty Host: Dr. Olivier Coutier-Delgosha
Abstract: In recent years, there has been an increased interest in the use of lighter and more advanced materials for air and sea vehicles. Compared to traditional metallic alloys, advanced polymer composites offer the advantage of significant weight savings, better fatigue performance, higher durability, and better resistance to seawater corrosion and other chemical agents. Moreover, active materials, sensors, and actuators can be embedded inside composites to develop multi-functional structures that can not only bare load, but also provide improved performance, enable in situ flow and structural health monitoring, control flow, as well as related noise and vibration issues. Although there exists many advantages, there are many challenges to the design, analysis, testing, and operation of lightweight marine structures, particularly ones that operate in complex multiphase flows. Any structure that is designed to interact with the surrounding flow are intrinsically more sensitive to changes in flow conditions and rapid body manoeuvres. Bodies oscillating between air-water interfaces or in cavitating or ventilated flows can experience hydrodynamic added mass, damping, and de-stiffening forces that changes with time, leading to parametric excitations. On the one hand, lock-in of one of the flow excitation frequencies with a body natural frequencies or their harmonics can lead to dynamic load amplifications, flow-induced vibrations, noise, and even material/structural failure. On the other hand, natural flow-induced vibrations can be used for renewable ocean energy harvesting or flow sensing. Hence, the focus of this talk is to illuminate the complex interplay between structural deformations and multiphase flows, and discuss the various maritime applications.
Bio: Prof. Young is a Professor at the Department of Naval Architecture and Marine Engineering and the Director of the Marine Hydrodynamics Laboratory at the University of Michigan. Prof. Young’s research focuses on the dynamic response and stability of smart marine structures in multiphase flows, with direct applications to marine vehicles, energy harvesting and energy saving devices. Prof. Young is a member of the Seakeeping Committee for the International Towing Tank Conference (ITTC), and a member of the joint ITTC-ISSC (International Ship and Offshore Structures Congress) Working Group. Prof. Young also served on the United States National Committee on Theoretical and Applied Mechanics (USNC/TAM). Prof. Young has written over 250 journal and conference papers. Her research has been supported by the Office of Naval Research (ONR), the Naval Surface Warfare Center (NSWC), and the National Science Foundation (NSF).