Contribution of Lighthill tensor components to far-field acoustic pressure

Abstract

We numerically investigate the contribution of different components of the Lighthill tensor to the far-field acoustic pressure arising from laminar flow noise around a rigid cylinder. Computational fluid dynamics simulations were used to obtain the flow field, from which the time histories of the velocity components were stored to calculate the Lighthill tensor. The acoustic pressure was then calculated based on the Lighthill source distribution and free-field Green's function. The contribution and characteristics of the different components of the Lighthill tensor to the far-field pressure are described.