Fluid-structure interaction and computational aeroacoustics of the flow past a thin flexible structure

Abstract

In many technical applications the interaction between a fluid flow and a thin flexible structure leads to the generation of acoustic noise which is caused by flow induced structural vibrations. Examples for such applications are coverings and panelings of cars and airplanes. In many cases the generated noise is unwanted so that noise reduction is a topic of major interest. In the present work we investigate the acoustic field resulting from the interaction of a thin flexible structure with a turbulent flow field by means of numerical simulation. Two different model configurations are considered: one is the flow over a flexible plate, in the second case the flexible plate is located in the wake of a square cylinder. The major aim of this work is to provide a better understanding of the noise generation processes in these flow cases. The numerical methodology applied is utilized for a decomposition of the acoustic field into one part generated by the structural vibrations and another part which is due to stream noise. Finally, comparisons to experimental data available at our institute are provided.

Numerical Simulation of Selected Two-Dimensional and Three-Dimensional Fluid-Structure Interaction Problems Using OpenFOAM Technology

“…The physical changes are evidenced from explosive structural loading, acoustics, liquid sloshing in open and closed vessels, 2 fluid-induced vibrations, building wind loads, bridge deck, and aerodynamic fluttering, etc. [2]. A review of FSI is important because it enhances knowledge in engineering design against wave stress effects on solids that may result in large deformations and damages [3].…”