Étude par simulation directe temporelle des effets de la température sur l'émission acoustique des couches de mélange

Abstract

Direct Numerical Simulations of isothermal and non-isothermal, temporal mixing layers are performed on a computational domain which is large enough to analyse acoustic data in terms of far field. Computation of sound emissions shows that the acoustic radiation is significantly modified by the temperature, according to experimental trends. Then DNS data are used to predict the noise emission from the Lighthill's acoustic analogy. By accounting for the two acoustic source terms, results from direct computations and predictions from acoustic analogy are in excellent agreement.