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 D01: Nonlinear Dynamics: Coherent Structures I
2:30 PM–4:27 PM,
Sunday, November 18, 2018
Georgia World Congress Center
Room: B201
Chair: Rich Kerswell, University of Cambridge
Abstract ID: BAPS.2018.DFD.D01.3
Abstract: D01.00003 : Multiresolution Optimized Dynamic Mode Decomposition
2:56 PM–3:09 PM
Presenter:
Nasser Heydari
(Lehigh University)
Authors:
Nasser Heydari
(Lehigh University)
Nathan Kutz
(University of Washington)
Panayiotis Diplas
(Lehigh University)
The performance of exact-DMD, optimized-DMD, and Multiresolution optimized-DMD are examined for an intricate flow around a vertical retaining wall structure embedded in a gravel bed. The experimental configuration is of paramount interests for the practitioners dealing with sediment erosion around the base of instream structures. The measurements were obtained employing a stereo particle image velocimetry (SPIV) in a plane perpendicular to the approach flow direction at the leading edge of the protrusion. The results indicate that optimized-DMD outperforms exact-DMD as it pulls out the stable modes. However, the flow under consideration is too complex, consist of multi-temporal and spatial scales, that it requires a large number of modes to approximate the coherent structures present in the flow. Thus, multiresolution optimized-DMD capable of separating slow and fast moving modes in a recursive manner is employed. Two criteria are considered for the selection of modes at each level: 1) a frequency cut-off, and 2) energy content. This is a robust approach to separate complex systems into a hierarchy of important multiresolution time-scale components.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.D01.3
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700