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Published on May 27, 2014 by Aaron Dubrow

Air pushed through vocal folds causes them to vibrate, creating an unsteady air stream that generates sound. The sound is modified as it travels through the throat, nose, tongue, and, eventually leaves the speaker's mouth. Credit: Daniel J. Bodony, Department of Aerospace Engineering, University of Illinois at Urbana-Champaign

Reducing the Intensity of Jet Noise

Aerospace engineers from the University of Illinois, Urbana-Champaign are using Stampede to explore the aeroacoustics of jets on modern aircraft. Their aim is to understand how jets in general, and those with significant levels of turbulence, generate noise.

Jet engines generate intense sound waves that bother people who live near active airports. The noise can be so bothersome that often limits are placed on how loud aircraft can be and how many aircraft can fly over residential communities. Making jet aircraft quieter requires new engine designs; however, no simple explanation of how jets generate noise is available.

Daniel Bodony and his colleagues are trying to solve this problem. They are using Stampede to simulate the turbulent motion generated by air moving through the jet engines and then virtually testing the shape and location of actuators and acoustic liners that can reduce jet noise. This research has been published in the Journal of Fluid Mechanics and Physics of Fluids.

In related research, Bodony is seeking to understand how your voice is created, which also relies on the research around the aeroacoustics of jets; however, this time, the unsteady jet of air is created by your vocal folds, or vocal chords, when you speak. Once speech production is understood, Bodony and his team will use Stampede to determine how to design synthetic vocal chords to restore speech when it is lost due to strokes or other pathologies.

"Stampede has been a very easy platform on which to run our production simulations, and its more-than-two-times speed advantage over Ranger quickly made it a favorite," Bodony said. "It is our workhorse platform and enables our fundamental research that supports science and engineering objectives, including jet noise reduction, human voice prediction and control, and analysis of future high-speed aircraft systems.

"Further, the Stampede software stack has made profiling and optimizing our simulation code productive so that we are getting ‘more science' out of each hour of Stampede usage."

This research was published in the Journal of Fluid Mechanics and Physics of Fluids.

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