Large-eddy simulation for supersonic rectangular jet noise prediction: effects of chevrons

Fully unstructured large-eddy simulation coupled with a Ffowcs Williams–Hawkings solver was used to predict the noise from underexpanded supersonic jets issuing from rectangular nozzles. The effect of the chevrons was considered by comparing simulations with and without the addition of chevrons around the nozzle lip. The entire flow in and around the nozzle is simulated using the CharLES solver, on unstructured meshes containing up to 528 million control volumes. The massively parallel code was scaled up to as many as 163,840 processors. A mesh sensitivity study was performed, and the far-field noise predictions were compared with measurements conducted at the NASA Glenn Research Center. For the underexpanded isothermal operating conditions considered, chevrons are observed to produce a substantial noise reduction.

[1]  Christopher K. W. Tam,et al.  SUPERSONIC JET NOISE , 1995 .

[2]  Anjaneyulu Krothapalli,et al.  The effect of streamwise vortices on the aeroacoustics of a Mach 0.9 jet , 2007, Journal of Fluid Mechanics.

[3]  Sanjiva K. Lele,et al.  High-fidelity large-eddy simulation for supersonic rectangular jet noise prediction , 2011 .

[4]  Philippe R. Spalart,et al.  LES-Based Noise Prediction for Shocked Jets in Static and Flight Conditions , 2010 .

[5]  H. Xia,et al.  Large-eddy simulations of chevron jet flows with noise predictions , 2009 .

[6]  P. Spalart,et al.  Noise Prediction for Increasingly Complex Jets. Part I: Methods and Tests , 2005 .

[7]  C. Tam,et al.  Subsonic Jet Noise from Nonaxisymmetric and Tabbed Nozzles , 2000 .

[8]  P. Moin,et al.  Unstructured Large Eddy Simulation for Prediction of Noise Issued from Turbulent Jets in Various Configurations , 2011 .

[9]  Ugo Piomelli,et al.  Large eddy simulations , 2010, Advanced Approaches in Turbulence.

[10]  James Bridges,et al.  Extensible Rectangular Nozzle Model System , 2011 .

[11]  Philippe R. Spalart,et al.  Variants of the Ffowcs Williams - Hawkings Equation and Their Coupling with Simulations of Hot Jets , 2009 .

[12]  Philippe R. Spalart,et al.  Flow and Noise Predictions for Single and Dual-Stream Beveled Nozzles , 2008 .

[13]  Ali Mani,et al.  Analysis and optimization of numerical sponge layers as a nonreflective boundary treatment , 2012, J. Comput. Phys..

[14]  Rainald Löhner,et al.  Large-Eddy Simulations of a Supersonic Jet and Its Near-Field Acoustic Properties , 2009 .

[15]  A. W. Vreman.  An eddy-viscosity subgrid-scale model for turbulent shear flow: Algebraic theory and applications , 2004 .

[16]  Christopher K. W. Tam,et al.  Influence of Nozzle Geometry on the Noise of High-Speed Jets , 1998 .

[17]  P. Morris,et al.  Noise simulations of supersonic hot jets for chevron nozzles , 2011 .