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Networked-oscillator-based Modeling And Control Of Unsteady Wake Flows

Title: Networked-oscillator-based Modeling And Control Of Unsteady Wake Flows.
Name(s): Nair, Aditya G., author
Brunton, Steven L., author
Taira, Kunihiko, author
Type of Resource: text
Genre: Journal Article
Journal Article
Date Issued: 2018-06-18
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: A networked-oscillator-based analysis is performed to examine and control the transfer of kinetic energy for periodic bluff body flows. The dynamics of energy fluctuations in the flowfield are described by a set of oscillators defined by conjugate pairs of spatial proper orthogonal decomposition (POD) modes. To extract the network of interactions among oscillators, impulse responses of the oscillators to amplitude and phase perturbations are tracked. Tracking small energy inputs and using linear regression, a networked-oscillator model is constructed that reveals energy exchange among the modes. The model captures the nonlinear interactions among the modal oscillators through a linear approximation. A large collection of system responses is aggregated to capture the general network structure of oscillator interactions. The present networked-oscillator model describes the modal perturbation dynamics more accurately than the empirical Galerkin reduced-order model. The linear network model for nonlinear dynamics is subsequently utilized to design a model-based feedback controller. The controller suppresses the modal amplitudes that result in wake unsteadiness leading to drag reduction. The strength of the proposed approach is demonstrated for a canonical example of two-dimensional unsteady flow over a circular cylinder. The present formulation enables the characterization of modal interactions to control fundamental energy transfers in unsteady bluff body flows.
Identifier: FSU_libsubv1_wos_000435445900023 (IID), 10.1103/PhysRevE.97.063107 (DOI)
Keywords: fluid-flows, decomposition, coherent structures, spectral properties, circular-cylinder, immersed boundary method, dynamical-systems, galerkin models, spread, vortex-induced vibrations
Publication Note: The publisher’s version of record is available at
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Owner Institution: FSU
Is Part Of: Physical Review E.
Issue: iss. 6, vol. 97

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Nair, A. G., Brunton, S. L., & Taira, K. (2018). Networked-oscillator-based Modeling And Control Of Unsteady Wake Flows. Physical Review E. Retrieved from