A PARALLEL 3-DIMENSIONAL COMPUTATIONAL AEROACOUSTICS METHOD USING NONLINEAR DISTURBANCE EQUATIONS

This paper describes the application of a three-dimensional computatio nal aeroacoustics (CAA) methodology to the prediction of jet noise. Th e technique has been implemented using parallel computers. In this app roach the nonlinear disturbance equations are solved in a conservative form using a finite-difference based technique. A fourth-order optimi zed dispersion relation preserving scheme is used for spatial discreti zation and a fourth-order classical Runge-Kutta scheme is employed for temporal discretization. The three-dimensional CAA code has been para llelized using a domain decomposition strategy in the streamwise direc tion. The calculations are carried out on both IBM-SP2 and SGI Power-C hallenge parallel computers using message passing interface routines t o facilitate exchange of boundary data between adjacent nodes (process ors). Excellent parallel performance has been obtained using the prese nt code. Acoustic results are presented for a perfectly expanded super sonic axisymmetric jet under harmonic and random inlet conditions. Res ults are given for both the instantaneous and averaged flow and acoust ic variables. Comparisons are made between the predictions and experim ental data. (C) 1997 Academic Press.