Session: FSI-02-09 FSI Applications III

Paper Number: 154876

154876 - Vortex-Induced Vibration of a Rectangular Cross Section With Combined Torsional and Plunging Modes 

Abstract: 

Periodic vortex shedding downstream of a rectangular cross-section can result in excessive vibration, reducing fatigue life. Accurate characterization of fluid-structural interaction is important to avoid the excitation of significant vibration, thus extending the structural integrity and preventing structural failure. Therefore, reliable modeling of the expected amplitude and frequency of the coupled modes can provide valuable information necessary to implement adequate countermeasures. This study numerically investigates the vibration response of a rod with a rectangular cross-section susceptible to both cross-flow and rotational vibration modes. A coupled two-dimensional fluid-structural model, based on a general Eulerian-Lagrangian formulation, is used to solve the equations of structural vibration and fluid flow. The model provides predictions of fluid forces and the motion of the rectangular cross section under forces induced by vortex shedding. The amplitude, frequency, and phase characteristics of the coupled cross-flow and rotational modes are presented and compared to vortex-induced vibration in a single-degree-of-freedom system. The effect of the coupling between modes at different flow velocities on frequency lock-in is identified by exploring the spectral characteristics of the vibration response for different mode natural frequencies. Moreover, the effects of flow conditions and the cross-flow and rotational natural frequencies on motion amplitude and frequency are analyzed and presented.

Presenting Author: Mahmoud Shaaban Mechanical Engineering Program, School of Engineering and Applied Sciences, Nile University

Presenting Author Biography: Mahmoud is an Assistant Professor of Mechanical Engineering at Nile University, Egypt. He is an alumnus
of Cairo University and has a PhD from Ontario Tech University in Canada. He is a Professional Engineer
with extensive academic and industrial experience in Fluid-Structure Interaction, Structural Dynamics, and
Vibration. He worked as a consultant for projects of academic and industrial scopes in the fields of Fluid-
Structure Interaction, Noise, Vibration, and Aeroacoustics, and Thermal-hydraulic Analysis. Mahmoud
teaches undergraduate engineering courses in Thermal Sciences, Solid Mechanics, and Vibration.

Authors:

Mahmoud Shaaban Mechanical Engineering Program, School of Engineering and Applied Sciences, Nile University
Mostafa R. Rashed Mechanical Engineering Department, Faculty of Engineering, Modern University for Technology and Information
Atef Mohany Fluid-Structure Interactions and Noise Control Lab, Ontario Tech University