Computation of Noise From Fully-Expanded Supersonic Jet Using Low-Dispersion Methodology

A novel mathematical model and its solution are presented to simulate the generation and the propagation of supersonic jet noise. An objective in developing this model was to seek an approach that would be feasible in a design environment, where a number of consecutive simulations would be needed. Hence, a judicious compromise was afforded between the computational efficiency and the overall accuracy of the methodology in representing the underlying physics. The noise generation was modeled as axisymmetric or helical instabilities introduced in the upstream boundary. The propagation was simulated by solving the three-dimensional and linearized Euler equations in a very efficient way by a dispersion-relation-preserving scheme. The predicted relative values of the sound pressure level contours have successfully been compared with the experimental data and other computational approaches.