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MEAM Seminar: “Predicting and Reducing High-Speed Jet Noise”
October 25, 2022 at 10:00 AM - 11:30 AM
The intense noise radiated by supersonic jets leads to sound-induced structural vibration, fatigue and personnel-related operational difficulties. Experimental, theoretical, and computational investigations into the physics and control of jet noise have identified several important sound sources, including wavepackets, screech, Mach wave radiation, and broadband shock associated noise. Reducing the loudest sources of jet noise, without sacrificing propulsive performance, has relied on intuition, parametric survey, or optimal control techniques. With the aim of developing a more general and robust method of jet noise reduction, we present a physics-based approach that reveals jet dynamics/mechanisms, highlighted by a linear resolvent analysis, crucial to the the generation of jet noise in a biconical tactical jet nozzle. Our approach uses large-eddy simulation to predict the turbulent flow within and exhausted by the jet nozzle and then identifies optimal forcing/response modes of the compressible Navier-Stokes operator, linearized about a fully-resolved jet mean flow, to identify and manipulate coherent structures that are primarily responsible for the production of jet noise. The operating conditions of the jet and nozzle geometry are motivated by tactical Naval aircraft.
Daniel J. Bodony
Blue Waters Associate Professor of Aerospace Engineering, University of Illinois at Urbana-Champaign
Daniel J. Bodony is the Blue Waters Professor of Aerospace Engineering and Associate Dean for Graduate, Professional, and Online Programs in the Grainger College of Engineering at the University of Illinois at Urbana-Champaign. Professor Bodony is a Donald Biggar Willett Faculty Scholar and recipient of the Dean’s Award for Excellence Research (2016), the William L. Everitt Teaching Award (2018), the Campus Promotion with Distinction Award (2020), and most recently the Rose Award for Teaching Excellence (2022). He received his Ph.D. in Aeronautics & Astronautics from Stanford University in 2005 and joined UIUC in 2006 after working at the NASA Ames/Stanford Center for Turbulence Research. He received a National Science Foundation CAREER award in 2012 in Fluid Dynamics and is an Associate Fellow of the AIAA.