Synthetic turbulence applied to broadband interaction noise

Dieste, Martin and Gabard, Gwenael (2009) Synthetic turbulence applied to broadband interaction noise. In Proceedings of the 15th AIAA/CEAS Aeroacoustics Conference (30th AIAA Aeroacoustics Conference). American Institute of Aeronautics and Astronautics. 14 pp .

Abstract

The aim of this paper is to investigate the use of synthetic turbulence and its application to broadband interaction noise by introducing it as a source in the linearized Euler equations. The turbulence generator model is able to synthetize two-dimensional incompressible, isotropic velocity fields by filtering white noise. The filter is expressed in terms of either the correlation function or the energy spectrum. In contrast with most filter-based models, non-Gaussian filters such as those derived from the Liepmann and von Karman spectra are considered. Another difference with previous work is that a fully Lagrangian approach is used. Random vortices are launched upstream of the flat plate and convected with the mean flow. The turbulent velocity field is computed and its normal velocity imposed along the airfoil. Simulation results are presented for a two-dimensional flat plate interacting with isotropic homogeneous turbulence. Results are compared with the analytical solution proposed by Amiet.

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