Events Calendar

Title: Advanced Marine Structures in Multiphase Flows

Presented by: Dr. Yin Lu Young, Ph.D.

Director, The Aaron Friedman Marine Hydrodynamics Laboratory

Professor, Department of Naval Architecture & Marine Engineering

Professor, Department of Mechanical Engineering

University of Michigan

Abstract:

In recent years, there has been an increased interest in the use of advanced materials for maritime applications, including propellers, turbines, hydrofoils, control surfaces, energy saving and energy harvesting devices.  Compared to traditional metallic alloys, advanced polymer composites offer the advantage of higher strength-to-weight ratio, better fatigue characteristics, higher durability, and better resistance to sea water corrosion and other chemical agents.  Moreover, active materials, sensors, and actuators can be embedded inside composites to develop multi-functional marine structures that can not only bare load, but also provide improved functionality, including the ability to enable in situ flow and structural health monitoring, vibration and noise control, as well as renewable energy harvesting.  In particular, multi-functional marine structures can be designed to enable passive or active tailoring of the cavitation/ventilation inception speed, cavity size, and cavity shedding frequencies.  Although there exist many advantages, there are many challenges to the design, analysis, testing, and operation of multi-functional marine structures.  Any structure that is designed to interact with the surrounding multiphase flow are intrinsically more sensitive to changes in flow conditions and rapid body maneuvers. Moreover, the system natural frequencies and damping characteristics may vary with proximity to free surface, forward speed, waves, cavitation and ventilation.  Lock-in of the flow excitation frequency with one of the body natural frequencies or their harmonics can lead to dynamic load amplifications, flow-induced vibrations and noise, flutter and even parametric resonance.  Nonlinear feedback between the surrounding multiphase flow and body deformations, as well as hysteresis fluid-structure interaction behavior further complicate flow control methodologies.  Hence, the focus of this talk is to advance the fundamental understanding of the fluid-structure interaction response and stability of advanced marine structures in complex, multiphase flows, and to explore innovative methods to develop multi-functional marine structures to sense and control cavitation and/or ventilation.

Individuals with disabilities are encourages to attend all University of Iowa sponsored events.  If you have a disability which requires accommodation to participate, please contact the department prior to the event at 319-335-5939.