Numerical simulation of trailing-edge acoustic/vortical interaction

Abstract

The objective or the present research is twofold. The first part concerns the construction or a high-resolution aeroacoustic flow solver, and the remaining emphasizes the wave/vortex interaction around a sharp trailing edge. Euler equations and the Osher-Chakravarthy MUSCL-type high-resolution upwind TVD scheme were used, respectively, as the flow model and the numerical algorithm to analyze the acoustically excited flow. Modification on the reconstruction of the cell interface values was first made to improve the scheme fidelity so that a wave propagationproblem can be solved on nonuniform mesh systems. An acoustic source modeling was also devised to simulate the generation of sound emitted from a monopole located on the solid boundary. The numerical algorithm was first evaluated by checking the computed results with several test problems that have analytic solutions. Results show that the currently proposed computational aeroacoustic scheme is accurate and reliable. An acoustically excited incompressible and low-Mach-number flow over a finite plate was then simulated. The results show that the unsteady airloads induced by acoustic/vortical interaction around a sharp trailing edge can be satisfactorily resolved by the currently developed inviscid Euler flow solver