Sweeping Sound Generation in Jets Realized with a Random Particle-Mesh Method

Abstract

the sound spectrum in a manner that cannot be explained based on the classical Kolmogorov-theory of turbulence. But because of the lack of appropriate methods these findings could not be incorporated into the common statistical modeling approaches for realistic aeroacoustic problems using for example the acoustic analogy. In this article we develop an ecient Random Particle-Mesh method which enables us to model successfully the sweeping mechanism. We use it to simulate the noise radiation of a realistic subsonic jet. The results show that sweeping dynamics of turbulence is an important noise production mechanism in jets. Noise from the fine-scale turbulence can be predicted. There are furthermore indications that also Mach waves are generated.