Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session F06: Aeroacoustics
8:00 AM–10:10 AM,
Monday, November 19, 2018
Georgia World Congress Center Room: B208
Chair: Yuji Hattori, Tohoku University
Abstract ID: BAPS.2018.DFD.F06.1
Abstract: F06.00001 : Resolvent analysis of a Mach 1.5 jet for noise source identification*
8:00 AM–8:13 AM
Ethan M Pickering
Ethan M Pickering
Oliver T Schmidt
Tim E Colonius
Acoustic sources for an isothermal Mach 1.5 round jet are determined through resolvent analysis and spectral proper orthogonal decomposition (SPOD). Both physics-based resolvent analysis and data-driven SPOD (using a high-fidelity, experimentally-verified, large-eddy simulation (LES) database) provide a basis for predicting the perturbation field. Singular value decomposition of the resolvent operator constructed using an LES baseflow identifies optimal volumetric forcing modes and their corresponding linear responses. In order to determine physically relevant modes, projections of the highest gain responses and highest energy SPOD modes from LES realizations are computed. To determine the occurrence of the associated resolvent forcings, projections are then computed upon the full LES nonlinear terms and the distribution of these values leveraged for jet noise modeling.
*This research was supported by a grant from the Office of Naval Research (grant No. N00014- 16-1-2445). Ethan Pickering was supported by the Department of Defense (DoD) through the National Defense Science & Engineering Graduate Fellowship (NDSEG) Program.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.F06.1
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