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Large-eddy simulations of co-annular turbulent jet using a Voronoi-based mesh generation framework

Brès, Guillaume A. and Bose, Sanjeeb T. and Emory, Michael and Ham, Frank E. and Schmidt, Oliver T. and Rigas, Georgios and Colonius, Tim (2018) Large-eddy simulations of co-annular turbulent jet using a Voronoi-based mesh generation framework. In: 2018 AIAA/CEAS Aeroacoustics Conference, 25-29 June 2018, Atlanta, GA.

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Large eddy simulations are performed for a cold ideally-expanded dual-stream jet issued from cylindrical co-axial nozzles, with supersonic primary stream (Mach number M_1 = 1.55) and subsonic secondary stream (M_2 = 0.9). The geometry includes the internal screw holes used to fasten the two nozzles together and to the plenum chamber. These slanted cylindrical holes over which the secondary stream flows were not covered in the experiment and were seamlessly captured in the computational mesh thanks to a novel grid generation paradigm based on the computation of Voronoi diagrams. A simulation with the screw holes covered is also performed and the preliminary results tends to indicate that these features have minimal impact on the flow and acoustic fields for the present operating conditions. As expected, the present dual-stream configuration with subsonic annular stream surrounding the primary supersonic stream features a reduced shear-layer growth, a longer potential core and a lack of strong Mach wave radiation. A long LES database is currently being collected for analysis and modeling of wavepackets and noise sources in such complex turbulent jets.

Item Type:Conference or Workshop Item (Paper)
Related URLs:
URLURL TypeDescription Paper Paper
Brès, Guillaume A.0000-0003-2507-8659
Schmidt, Oliver T.0000-0002-7097-0235
Rigas, Georgios0000-0001-6692-6437
Colonius, Tim0000-0003-0326-3909
Additional Information:© 2018 by The Authors. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission. Published Online: 24 Jun 2018. The LES studies are supported in part by NAVAIR SBIR projects, under the supervision of Dr. John T. Spyropoulos and by ONR grant N00014-16-1-2445. The main calculations were carried out at DoD HPCMP supercomputer system "Onyx" in ERDC DSRC. The authors would like to thanks Prof. Kris Ahuja, Aharon Karon & Nick Breen of Georgia Institute of Technology, for providing the nozzle geometry and experimental data for the co-annular jet.
Funding AgencyGrant Number
Office of Naval Research (ONR)N00014-16-1-2445
Subject Keywords:Aeroacoustics
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Other Numbering System NameOther Numbering System ID
AIAA Paper2018-3302
Record Number:CaltechAUTHORS:20190709-092059954
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:96962
Deposited By: Melissa Ray
Deposited On:10 Jul 2019 22:41
Last Modified:16 Nov 2021 17:25

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