Installed jet noise prediction with Jet3D

Abstract

Much of the aircraft noise reduction research in recent decades has been concentrated at the component level in understanding the physics of noise generation, formulating noise prediction methods, and developing noise reduction strategies. A new strategy in NASA’s noise reduction program is a focus on the noise effects specifically attributable to installation. This focus will also extend to developing noise reduction strategies that take advantage of installation effects. An essential requirement for an installed jet noise prediction method is that it must be able to predict noise from complex three-dimensional flows. Having this physics based capability is also desirable in order to develop a flexible noise prediction method applicable to the investigation of advanced concepts and revolutionary configurations. A jet noise prediction tool satisfying these objectives is currently under development at NASA Langley Research Center. The Jet3D methodology is based on Lighthills Acoustic Analogy and uses Reynolds-averaged Navier–Stokes (RANS) computational fluid dynamics (CFD) simulations from the PAB3D flow solver, with temperature-corrected two-equation turbulence closure and anisotropic Reynolds stress modeling. This talk describes development of the Jet3D noise prediction method and its application to installed jet configurations.