Simulation of sound generated by large-scale vortices in a shear layer by hybrid DVM/APE approach

Jing, Xiaodong, Wu, Long, Dai, Xiwen, Song, Minna and Sun, Xiaofeng (2014) Simulation of sound generated by large-scale vortices in a shear layer by hybrid DVM/APE approach. In 20th AIAA/CEAS Aeroacoustics Conference. American Institute of Aeronautics and Astronautics.. (doi:10.2514/6.2014-3293).

Abstract

In this paper, sound generated by large-scale votices in a two-dimensional low-Mach number turbulent shear layer is investigated. A hybrid DVM/APE (Discrete-Vortex Model and Acoustic Perturbation Equations) approach is proposed to study this vortex sound phenomenon. A discrete-vortex model is used to simulate unsteady fluid motions of the trailing edge shear layer. A conformal mapping is applied to solve the 2D inviscid flow near the half plane, which is originally used for the problem of a slit geometry. At the trailing edge of the plane, the effect of fluid's viscosity is imposed by a vortex shedding model and Kutta condition. The unsteady flow field is obtained after DVM simulation. The background mean flow field is acquired by a time-average algorithm. Then, acoustic perturbation equations are solved to obtain the acoustic field by CAA approaches with both acoustic sources and the background mean flow field determined from the results of DVM. Results demonstrate that this hybrid DVM/APE method is a feasible approach to simulate sound generated by the motions of vortices.

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Contributors

Author: Long Wu

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