Session: FSI-02-02 Acoustics

Paper Number: 123184

123184 - Influence of Resonant Acoustic Mode Shape on Source and Sink Patterns in the Wake of a Single Cylinder 

The interactions between the acoustic field and periodic flow structures in the wake of a cylinder can lead to the excitation of acoustic resonance, leading to excessive noise and vibrations in heat exchangers. The fundamental mechanism of energy exchange that controls the materialization of a resonant acoustic field relies on the coupling between the flow and acoustic parameters in space and time. Previous studies have shown that a net acoustic energy source over an entire coupled cycle is required to sustain the resonant conditions. However, the coupling mechanism was only studied for the excitation of the fundamental mode, and the fields were not fully coupled. In particular, the phasing between the resonant acoustic field and the fluid forces is a significant parameter that controls the intensity and location of the energy source. Ths parameter was typically imposed based on a non-coupled state, leading to largely qualitative results. In this work, Howe’s energy corollary is applied to estimate the acoustic energy generation and absorption induced by the flow downstream of a single cylinder in a rectangular duct. A resonant mode shape is imposed to calculate the acoustic and flow fields, acoustic energy generation, and phase delay between the acoustic field and the lift force to provide details of the coupling mechanism for the first three transverse acoustic mode shapes.

Presenting Author: Mahmoud Shaaban Nile University

Presenting Author Biography: Assistant Professor of Mechanical Engineering at Nile University and a Professional Engineer with extensive academic and industrial experience in Fluid-Structure Interaction, Structural Dynamics, and Vibration.

My Research focus on Experimental Aeroacoustics and Fluid-Structure Interaction. My objective is to contribute to the understanding of flow-induced vibration and energy transfer in systems that involve flow-induced vibration phenomena. Vibration, especially induced by fluid flow, is crucial to design devices for operation and safety purposes to avoid sudden catastrophic failures. Novel ideas in fluid-structure interaction can inspire devices with applications in renewable energy harvesting and storage and are part of the necessary efforts to fight Climate Change through development of low-carbon electricity generation technology.

Get in touch at emam.mahmoud@gmail.com

Authors:

Mahmoud Shaaban Nile University
Mostafa Rashed Modern University for Technology and Information
Atef Mohany Ontario Tech University