Journal article

Direct numerical simulation of turbulent flow with an impedance condition

S Olivetti, RD Sandberg, BJ Tester

Journal of Sound and Vibration | Academic Press | Published : 2015

Abstract

DNS solutions for a pipe/jet configuration are re-computed with the pipe alone to investigate suppression of previously identified internal noise source(s) with an acoustic liner, using a time domain acoustic liner model developed by Tam and Auriault (AIAA Journal, 34 (1996) 913-917). Liner design parameters are chosen to achieve up to 30 dB attenuation of the broadband pressure field over the pipe length without affecting the velocity field statistics. To understand the effect of the liner on the acoustic and turbulent components of the unsteady wall pressure, an azimuthal/axial Fourier transform is applied and the acoustic and turbulent wavenumber regimes clearly identified. It is found th..

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University of Melbourne Researchers

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Funding Acknowledgements

The first author acknowledges financial support from the Faculty of Engineering and the Environment. We are grateful to Patrick Bechlars for providing us with the tools to obtain probability density functions.