A numerical study on the entropy noise generated in sudden cross-sectional area changes
Résumé
In this work, we investigate numerically the sound gen-erated when incoming entropy waves are decelerated in a sudden area expansion. To this end, we linearise the compressible Navier-Stokes equations around a turbulent meanflow. The mean flow is obtained as a solution of the RANS equations. The linearised equations are then solved in thefrequency domain to determine the acoustic variables. Fi-nally, the transmission and reflection coefficients are obtained and compared with the predictions of two different quasi-steady models
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