Computation of noise radiated by a subsonic jet using an implicit large-eddy simulation methodology

Abstract

In this work was developed an implicit Large-Eddy Simulation (LES) methodology for the computation of noise radiated by a subsonic jet. In contrast to traditional LES methods based on eddy-viscosity models, the present methodology is based on the approximate deconvolution model (ADM) and the nonconservative form of compressible Navier-Stokes equations. The large difference of scales between the flow and acoustic field was accurately captured by the use of sixth-order schemes for spacial discretization and implicit filtering, and the fourth-order Runge-Kutta scheme for time integration. Boundary conditions and buffer zone treatments were prescribed by a characteristic-based formulation and a conceptual model based on the characteristic analysis. Computations of a Mach 0.9 jet at Reynolds number 65,000 were carried out using an MPI (Message Passing Interface) parallel solver with multi-block interface communication of type overlap. Flow dynamic characteristics, such as shear layer momentum thickness, jet decaying and spreading were analised.
The results obtained from the aerodynamic and acoustic field presented good agreement with experimental data and numerical results from the literature at similar flow conditions.