Fluid Structure Acoustics Interaction of the Flow Past a Thin Flexible Structure

摘要

The acoustic field resulting from the interaction of a thin flexible structure with a turbulent flow was investigatednboth numerically and experimentally. Two different model configurations were considered: in one a flexible platenacted as a moving wall in a turbulent boundary layer, and in the other the flexible plate was located in the wake of ansquare cylinder. The fully coupled simulation of the fluid–structure–acoustics interactionwas based on a partitionednapproach employing two different simulation codes: a finite-volume flow solver of second-order accuracy in spacenand time and a finite-element structural-mechanics and acoustics solver. A code coupling interface was used for thenexchange of data between the different discretizations. The experiments were performed in an acoustic wind tunnelnemploying microphone measurements of the sound pressure level. Detailed flow measurements were carried outnusing laser Doppler anemometry and three-component hot-wire anemometry. The flow-induced vibration of thenflexible structure was measured with a laser-scanning vibrometer. Experimental and numerical results charac-nterizing the flow field, the structural vibration, and the generated sound are presented.