A numerical investigation on supersonic twin-jet noise using optimized compact monotonicity-preserving scheme

Abstract

A numerical investigation into the noise characteristics of twin-jet is presented. We considered fully-expanded Mach number 1.358 two different distances (s/D=3.0 and s/D=2.5) of inter- nozzles. As proven by experiments in previous studies, these cases have opposite oscillating modes, and the results by present simulations coincident with them. In particular, the symmetric flapping mode generated very large amplitude of acoustic wave so that the dominant frequency reaches up to near 160dB. In addition, by virtue of high-resolution feature of the present scheme, the numerical simulations resolved broadband noise which represented similar level in both cases.