Simulation of a Nozzle-Jet Configuration Including the Acoustic Near-Field



A numerical simulation setup is presented which allows to study a circular jet flow configuration in which the nozzle is included in the simulation domain. Direct Numerical Simulations (DNS) are performed using up to 10th order compact finite-difference schemes which are stabilized by applying a mild low-pass filter. A parallelization approach has been implemented which shows good weak and strong scaling behavior. At the inflow the Synthetic Eddy Method is employed to generate turbulent fluctuations in the nozzle boundary layer with prescribed statistics, which are imposed by a sponge (forcing) layer technique. Simulation results for the jet flow field obtained at Reynolds number ReD = 19000 and a Mach number Ma = 0.9 as well as for the acoustic near-field are found to be in good agreement with recent nozzle-jet simulation results as well as experimental findings. (© 2012 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim)