Fluid-structure-acoustic coupling for a flat plate |
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| Affiliation: | 1. Faculty of Maritime and Transportation, Ningbo University, Ningbo 315000, PR China;2. Institute of Vibration and Noise Control, College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, PR China;1. Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore;2. DSO National Laboratories, 20 Science Park Drive, Singapore 118230, Singapore;1. Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Hong Kong SAR, China;2. College of Engineering, Peking University, Beijing, China |
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| Abstract: | The present work deals with the aeroacoustic sound radiated by a forward–backward facing step in combination with a flexible wall behind the step. A numerical flow computation with coupled aeroacoustic and vibroacoustic simulation was carried out. The structural deformations of the oscillating plate like structure in the wake of the forward–backward facing step were considered to be small and therefore not affecting the flow field. The presented approach enables a separate consideration for the aeroacoustic as well as the structural borne noise. The influence of the interactions of the acoustic medium with the flexible structure on the vibroacoustic sound radiation is investigated. One-sided and two-sided coupling approaches for the vibroacoustic analysis are introduced. The two-sided vibroacoustic computation allows for considering the damping influence of the ambient fluid on the flexible plate vibration and therefore on the sound radiation. Additional to the simulations, aeroacoustic measurements in an acoustic wind tunnel were performed for validation purposes. |
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