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Lookup NU author(s): Dr Ali Bakhshandehrostami
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This paper is dedicated to the simulation of fluttering (oscillatory) and tumbling (rotational) phenomenon that may occur during the flow induced rotation in the water or air current. Fluttering is the oscillation of body about an axis and the tumbling, better called here as autorotation, is a name given to the case when the body turns continuously around the axis. This work describes the simulation of these phenomena by a nonlinear time domain code on freely rotating plate about a fixed vertical axis. The dimensional analysis proves that the rotational motion induced by flow is governed essentially by the dimensionless moment of inertia (I*) and Reynolds number. For Reynolds number less than 15000, plate experiences small amplitude fluttering motion that is independent of I*. It is shown that by increasing I* the fluttering bifurcates to autorotation, with a transition point that is approximately independent of Reynolds number and is such that I*=0.083.
Author(s): Bakhshandehrostami A, Fernandes AC
Publication type: Conference Proceedings (inc. Abstract)
Publication status: Published
Conference Name: International Conference on Ocean, Offshore and Arctic Engineering (OMAE 2015)
Year of Conference: 2015
Number of Volumes: OMAE2015-41244
Online publication date: 01/10/2015
Acceptance date: 30/01/2015
Date deposited: 12/07/2018
Publisher: The American Society of Mechanical Engineering (ASME)
Sponsor(s): Ocean, Offshore and Arctic Engineering Division