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 F21: Boundary Layers: Modeling and Analysis
8:00 AM–9:57 AM,
Monday, November 19, 2018
Georgia World Congress Center
Room: B309
Chair: George Park, University of Pennsylvania
Abstract ID: BAPS.2018.DFD.F21.1
Abstract: F21.00001 : Resolvent and Spectral POD Analyses of a Laminar Separation Bubble*
8:00 AM–8:13 AM
Presenter:
Alberto Padovan
(Princeton University)
Authors:
Hao Zhang
(Princeton University)
Alberto Padovan
(Princeton University)
Clarence Rowley
(Princeton University)
Wen Wu
(Johns Hopkins University)
Charles Meneveau
(Johns Hopkins University)
Rajat Mittal
(Johns Hopkins University)
Resolvent analysis is an increasingly popular technique capable of providing insight about the input-output characteristics of a given fluid flow at a specified frequency and wavenumber. Moreover, the resolvent of the linearized Navier-Stokes operator can be used to compute the pseudospectrum, which can be important for non-normal operators as often arise in shear flows.
Direct numerical simulations are performed for three-dimensional laminar boundary layer flow in which suction and blowing are imposed at the top of the computational domain to generate a separation bubble at the bottom surface. The linear input-output (resolvent) operator is computed relative to the spanwise- and time-averaged mean flow, and the optimal forcing and response modes are obtained via a randomized singular value decomposition. The resulting forcing modes illustrate regions where the flow is most sensitive to perturbations. The corresponding response modes are compared with spectral (frequency-domain) POD modes obtained from snapshots of the direct numerical simulations, and the two sets of modes show similar features.
*This material is based upon work supported by the Air Force Office of Scientific Research under award number FA9550-17-1-0084.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.F21.1
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