Professor Anastasios (Tasos) Lyrintzis, PhD,

Distinguished Professor and ChairAerospace Engineering Embry-Riddle Aeronautical University 600S

Clyde Morris Blvd Daytona Beach FL 32114-3900

E-mail: [email protected]

URL:http://daytonabeach.erau.edu/college-engineering/aerospace/index.html

Abstract: Jet noise is an important issue concerns for people living or working in the vicinity of airports, stringent noise regulations, and military operational requirements. Processing speeds and memory limitations of existing supercomputers limit the faithfulness of these simulations. Thus the simulations are not accurate enough to allow design and testing of noise reduction strategies. In order to simulate realistic situations very fine grids (e.g. on the order of tens of billions of points) are sometimes needed, requiring significant computational resources. Thus very efficient algorithms are needed. An efficient, petascalable code has been developed based on the large eddy simulation (LES) technique. The code is a high-order multi-block structured solver capable of simulating both subsonic jets and supersonic jets with shock waves. A digital filter-based approximate turbulent inflow boundary condition is used. A wall model is employed in the nozzle walls to save computational time. Finally, a ghost-point-based immersed boundary method is implemented to allow simulation of complex nozzle shapes that show promise of noise reduction. We will show validation efforts for various noise control strategies including chevrons, beveling and fluidic injections.

Brief Biography of the Speaker: Dr. Lyrintzis is a Distinguished Professor and Chair of Aerospace Engineering at Embry-Riddle Aeronautical University and has also served at Purdue, University of Minnesota, Syracuse and Cornell University. Dr. Lyrintzis’ primary research interests are in the area of aerodynamics with emphasis on numerical methods and applications in aeroacoustics. His research endeavors have been supported by NSF, NASA, ARO, the US Navy and other agencies and industries. He has co-authored 62 journal and 125 conference papers and he has advised 21 Ph.D. students. (It should be noted that 7 of Dr. Lyrintzis’ advisees are Professors at Universities and one has received the NSF CAREER award). Dr. Lyrintzis is an AIAA Associate Fellow, an ASME Fellow, and a Boeing Welliver Fellow. He has been a member of the AIAA Aeroacoustics Technical Committee (vice-chair 05-07, chair 07-09), the AHS Acoustics Committee, the ASME Coordinating Group for CFD and he is the current Chair of ADCA (Aerospace Department Chair Association). Dr. Lyrintzis has co-organized the 10th and the 23th AIAA/CEAS Aeroacoustics Conferences Manchester UK and Denver CO (2004 and 2017, respectively), as well as many Sessions and Forums in AIAA, ASME and AHS Conferences. Dr. Lyrintzis has been an Associate Editor for the AIAA Journal and is currently an Associate Editor of the International Journal of Aeroacoustics. Finally, Dr. Lyrintzis has participated in the development of award-winning (American Helicopter Society, Howard Hughes Award, NASA Group Achievement Award) TRAC (TiltRotor Aeroacoustic Codes) system of codes from NASA Langley.