Direct Numerical Simulation And Mechanism Analysis Of Noise Generation For Vortex Dominated Flow

Vortex is an important structure of flow field, it not only has important influence on fluid dynamics, but also is the source of the aerodynamics noise. Through a series of derivation from the Navier-Stokes equation which describing the fluid movement, we established the general equation of aerodynamics noise in this paper, and two numerical integral methods for this equation have been established at the same time. A measurement tool is designed to quantitative analyse each item of the right hand side of the dilatation equation, so as to simplify the equation. The right hand side of the inviscid Phillips’equa-tion and inviscid Lilley’s equation are decomposed into the linear part and nonlinear part, with the use of the custom measurement tool, we obtain the magnitude varying pattern of the linear part and nonlinear part in the main noise field. We analyse the source of the noise and verifies the theoretical result obtained before by applying the direct numerical simulation method with high-order scheme to a series of problems, i.e., interaction of two co-rotating problem, shock-vortex interaction problem, temporal mixing layer problem.