NDLI: A temporal proper decomposition (TPOD) for closed-loop flow control

Content Provider	Springer Nature Link
Author	Gordeyev, Stanislav V. Thomas, Flint O.
Copyright Year	2013
Abstract	Motivated by closed-loop flow control applications, a formulation of the proper orthogonal decomposition (POD) is demonstrated, which is capable of characterizing not only the controlled and natural states of a given flow, but also the transient behavior between these states. This approach, which is termed temporal POD (TPOD), extracts the optimum frame of reference and the temporal information regarding the dynamics of the flow in the natural, controlled and transient states. In this paper, the TPOD concept is developed and is subsequently demonstrated in two experiments using dielectric barrier discharge plasma flow control: (1) flow over a circular cylinder at subcritical Reynolds number and (2) flow over a NACA 0015 airfoil at a large post-stall angle of attack. Both flows exhibit well-defined and distinct natural and controlled flow states. For the cylinder flow, the TPOD technique is used to develop a low-order dynamical systems model that is shown to properly capture the dynamics of the first TPOD mode, including the natural, forced and transient regimes. In the airfoil experiment, the TPOD approach is shown to provide the unique ability to conditionally examine the families of flow trajectories between natural and controlled states for user-selected initial conditions. This can be extremely useful in order to understand the physical mechanisms of flow control in complex flows where there may be very little a priori knowledge regarding the system behavior.
Starting Page	1
Ending Page	16
Page Count	16
File Format	PDF
ISSN	07234864
Journal	Experiments in Fluids
Volume Number	54
Issue Number	3
e-ISSN	14321114
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-03-03
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Engineering Fluid Dynamics Fluid- and Aerodynamics Engineering Thermodynamics, Heat and Mass Transfer
Content Type	Text
Resource Type	Article
Subject	Fluid Flow and Transfer Processes Physics and Astronomy Mechanics of Materials Computational Mechanics

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