DNS of Turbulent Round Jets Using Acoustically Lined Canonical Nozzles

Abstract

Direct Numerical Simulations (DNS) were conducted of fully turbulent flow exiting a long pipe into a laminar co-flow. The inclusion of the pipe in the simulations with a fully turbulent flow inside ensures that all possible noise generation mechanisms are represented. In response to earlier results obtained from this configuration showing contamination of the far field noise field by interior noise from the pipe, the internal pipe walls are acoustically lined using an impedance condition and the turbulent inflow generation technique is modified. In this paper it is shown that the combination of turbulent inflow generation changes and the application of an acoustic liner results in considerab..