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Computation of mixing layer noise using large eddy simulation

Christophe Bogey, Christophe Bailly, Daniel Juve
1999 5th AIAA/CEAS Aeroacoustics Conference and Exhibit   unpublished
An LES code (ALESIA for Appropriate Large Eddy Simulation for Aeroecoustics) is developed using special techniques of Computational AeroAcoustics (CAA). This approach allows a direct determination of the compressible field by solving the filtered Navier-Stokes equations. A 2-D subsonic mixing layer between two flows at 40 and 160 m.s-' is simulated in a computational domain, including the acoustic far field. The sound generated by vortex pairing is then investigated. The radiation pattern has a
more » ... ation pattern has a characteristic double spiral structure with a wavelength given by the frequency of pairings. Generation noise mechanisms correspond to those proposed by Powell' and Mitchell' in their studies on two co-rotative vortices. The directly computed farfield sound is compared to the prediction of Lighthill's acoustic analogy3 based on LES aerodynamic data. Results agree both with direct simulation and Colonius's works.4
doi:10.2514/6.1999-1871 fatcat:rstmgdhwlfdh7o4bhshdrml33e