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Aeroacoustics of an elastic element in unsteady flow of low reynolds numbers
KTH, School of Engineering Sciences (SCI), Mechanics.
KTH, School of Engineering Sciences (SCI), Mechanics.ORCID iD: 0000-0002-2906-9306
KTH, School of Engineering Sciences (SCI), Mechanics.ORCID iD: 0000-0001-7330-6965
2016 (English)In: 22nd AIAA/CEAS Aeroacoustics Conference, 2016, 2016Conference paper (Refereed)
Abstract [en]

Vibrations of elastic structures are a common occurrence in numerous fields of engineering such as aeronautics, aerodynamics, civil engineering, and biomechanics. Particular e ort is dedicated to aeroacoustics of elements that are excited to oscillatory behaviour due to fluid instabilities. The current study is concerned with the numerical investigation of the flow-induced vibrations of a flexible, beam-like element in crossflow at low Reynolds numbers of Re = 100 − 1000 by means of fluid-structure interaction simulations. The aeroa-coustics in the near field are assessed with direct computation of the compressible airflow. Additionally, an acoustic analogy is applied, characterising the acoustic sources and the corresponding sound propagation. At low Reynolds numbers and high elastic moduli the dipole source produces the highest pressure perturbation in the near field. At higher Reynolds numbers and low elastic moduli, however, the monopole source due to structural vibrations becomes the important sound generating mechanism. © 2016, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

Place, publisher, year, edition, pages
Keyword [en]
Acoustic wave propagation, Acoustics, Elastic moduli, Elasticity, Fluid structure interaction, Reynolds number, Structural dynamics, Flow induced vibrations, Generating mechanism, High elastic modulus, Low elastic modulus, Low Reynolds number, Numerical investigations, Pressure perturbation, Structural vibrations, Aeroacoustics
National Category
Mechanical Engineering
URN: urn:nbn:se:kth:diva-194604ScopusID: 2-s2.0-84982943380ISBN: 9781624103865OAI: diva2:1044100
22nd AIAA/CEAS Aeroacoustics Conference, 2016, 30 May 2016 through 1 June 2016

Conference Paper. QC 20161102

Available from: 2016-11-02 Created: 2016-10-31 Last updated: 2016-11-02Bibliographically approved

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