3rd French conference on acoustics
J. Phys. IV France 04 (1994) C5-935-C5-938
Une approche stochastique pour la modélisation du bruit des écoulements turbulentsC. BAILLY1, Ph. LAFON1 and S. CANDEL2
1 Direction des Etudes et Recherches d'Electricité de France, Département Acoustique et Mécanique Vibratoire, 1 avenue du Général de Gaulle, 92141 Clamart cedex, France
2 Ecole Centrale Paris, 92295 Châtenay-Malabry cedex, France
A new approach to noise modeling for free turbulent flows is presented. A set of equations is derived from the acoustic variables. In the left-hand side of this system, one finds the linearized Euler equations, whereas the right-hand side exibits source terms. These source terms are modeled in using a stochastic space-time description of the three-dimensionnal turbulent motion. The linearized Euler equations including a stochastic description of noise sources are solved numerically. The Stochastic and Noise Generation (SNGR) model is applied to a subsonic free jet. The weak interaction between the stationnary mean flow and the acoustic field is taken account. The limitations of the SNGR model lie in the statistical properties of the synthetic turbulent field and in the use of an axisymmetric modeling of the acoustic propagation.
© EDP Sciences 1994