Further Development of CAA Simulation for Isolated and Installed Nozzle Configurations

Abstract

A hybrid RANS/CAA approach with stochastic source modeling is used in this work for noise prediction. Previously, this methodology has been successfully applied to isolated configurations of jet and airframe with different source models. For the prediction of jet noise, the source model as proposed by Tam and Auriault has been used for isolated nozzle configurations. A modeling approach for isolated airframe noise configurations is relying on the vorticity based Lamb vector source model. The CAA simulation of installed configurations with the combination of jet and airframe requires however consideration of both noise generation mechanisms simultaneously. Thus, a vorticity based ‘Eddy Relaxation’ source model has been recently proposed as further development of this methodology, which is expected to capture the installation effect.