Numerical Methodology for the Computation of the Sound Generated by a Non-Isothermal Mixing Layer at Low Mach Number

摘要

The sound generated by an isothermal and a non-isothermal mixing layer is computed by two methods: an aeroacoustic direct computation and an aeroacoustic hybrid method composed of a quasi-incompressible simulation coupled with the linearized Euler's equations. A flow configuration that allows quantitative comparisons in the space-time domain is established. The good agreement found between the evolution of the computed flows allows comparisons of the radiated fields in terms of acoustic amplitude and directivity patterns, opening the analysis of incompressible acoustic source terms.