Abstract
This study analyzes the effects of shocklets on sound source characteristics by analyzing source terms of the Lighthill equation, which is obtained from the results of direct numerical simulations. The results show that shocklets become main sound sources at high turbulent Mach numbers and the two main source terms of Reynolds stress and entropy cancel each other out across shocklets. The behavior is explained analytically by using a one-dimensional shock relation. This paper also provides a possible explanation for the link between shocklets and the generation mechanism of crackle noise as well as the applicability of the present findings to source modeling of a nonlinear acoustic analogy.
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