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Seminar: Understanding the Fundamentals of Vortex-induced Vibrations: Research Past, Present and Future

24 February 2021 @ 3:30 pm - 4:30 pm

Deniz Gedikli, PhD
Assistant Professor
Ocean and Resources Engineering Department, University of Hawaii at Manoa

Figure 1: Example offshore platforms that undergo VIV

The canonical problem of fluid flow across an elastically mounted circular cylinder has been a widely studied problem in fluid mechanics due to the ubiquitous nature of the simple geometry in engineering applications and the resulting complexity of the fluid-structure interaction. In many engineering design and operation applications, it is advantageous to be able to predict fluid-structure interactions such as self-limiting vortex-induced vibrations, since these vibrations can strongly affect fatigue life or operational downtime in a variety of systems (e.g. motion of offshore structures, vibration of towed cables, loading on mooring systems, vibration of ship appendages, operation of heat exchangers, operation of drilling  risers, operation of sub-sea pipelines, etc.). While the vibration of physical continuous systems is complex, where many modes of the system may interact with the surrounding fluid wake, simplifications are often made to understand the relevant physics of the canonical problem. In the case of vortex-induced vibrations, one often considers a cylinder that moves perpendicular relative to the direction of the current, shedding a vortex street wake that in turn affects the forces exerted on the cylinder.

In this seminar talk, I will cover the fundamentals of flow-induced vibrations, in particular, vortex-induced vibrations and talk about our current research on combined in-line and cross-flow motions with some unique wake observations. I will also discuss the potential of these new findings on the prediction methods.

Figure 2: Vorticity Field

Speaker Bio:
Deniz Gedikli is an Assistant Professor in the Department of Ocean and Resources Engineering and the director of “Laboratory for Fluid-Structure Interactions and Nonlinear Dynamics Studies” at the University of Hawaii at Manoa. Before joining UH-Manoa, he was a postdoctoral fellow at the Norwegian University of Science and Technology (NTNU). He has received his PhD from the Department of Ocean Engineering at the University of Rhode Island. His research focuses on experimental fluid-structure interactions, and his interests include flow induced vibrations, Arctic offshore structures, aquaculture technology and offshore renewable energy systems, where he combines fluid dynamics research with ideas on advanced nonlinear dynamics.

***Please join us ten minutes early for a virtual coffee hour hosted by Dr. Ellen Briggs.***

Zoom Meeting Link
Meeting ID: 960 2310 3649
Passcode: ORE792

Seminar: Understanding the Fundamentals of Vortex-induced Vibrations: Research Past, Present and Future


24 February 2021
3:30 pm - 4:30 pm
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