Direct Aeroacoustic Simulation of Flow Impingement Noise in an Exhaust Opening 2011-01-1517
Unusual noises during vehicle acceleration often reflect poorly on customer perception of product quality and must be removed in the product development process. Flow simulation can be a valuable tool in identifying root causes of exhaust noises created due to tailpipe openings surrounded by fascia structure. This paper describes a case study where an unsteady Computational Fluid Dynamics (CFD) simulation of the combined flow and acoustic radiation from an exhaust opening through fascia components provided valuable insight into the cause of an annoying flow noise. Simulation results from a coupled thermal/acoustic analysis of detailed tailpipe opening geometry were first validated with off-axis microphone spectra under wide open throttle acceleration. After studying the visualizations of unsteady flow velocity and pressure from the CFD, a problem that had proved difficult to solve by traditional “cut and try” methods was corrected rapidly.
Citation: Powell, R., Hendriana, D., Gutzeit, B., Golsch, K. et al., "Direct Aeroacoustic Simulation of Flow Impingement Noise in an Exhaust Opening," SAE Int. J. Passeng. Cars – Mech. Syst. 4(2):961-969, 2011, https://doi.org/10.4271/2011-01-1517. Download Citation
Robert E. Powell, Dena Hendriana, Brian Gutzeit, Kevin Golsch, Gregory Fadler
Exa Corporation, General Motors LLC
SAE 2011 Noise and Vibration Conference and Exhibition
SAE International Journal of Passenger Cars - Mechanical Systems-V120-6EJ, SAE International Journal of Passenger Cars - Mechanical Systems-V120-6