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Modeling of transitional channel flow using balanced proper orthogonal decomposition

Phys. Fluids 20, 034103 (2008); doi:10.1063/1.2840197

Published 6 March 2008

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Miloš Ilak and Clarence W. Rowley
Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey 08544, USA
We study reduced-order models of three-dimensional perturbations in linearized channel flow using balanced proper orthogonal decomposition (BPOD). The models are obtained from three-dimensional simulations in physical space as opposed to the traditional single-wavenumber approach, and are therefore better able to capture the effects of localized disturbances or localized actuators. In order to assess the performance of the models, we consider the impulse response and frequency response, and variation of the Reynolds number as a model parameter. We show that the BPOD procedure yields models that capture the transient growth well at a low order, whereas standard POD does not capture the growth unless a considerably larger number of modes is included, and even then can be inaccurate. In the case of a localized actuator, we show that POD modes which are not energetically significant can be very important for capturing the energy growth. In addition, a comparison of the subspaces resulting from the two methods suggests that the use of a nonorthogonal projection with adjoint modes is most likely the main reason for the superior performance of BPOD. We also demonstrate that for single-wavenumber perturbations, low-order BPOD models reproduce the dominant eigenvalues of the full system better than POD models of the same order. These features indicate that the simple, yet accurate BPOD models are a good candidate for developing model-based controllers for channel flow. ©2008 American Institute of Physics
History: Received 26 July 2007; accepted 21 December 2007; published 6 March 2008
Permalink: http://link.aip.org/link/?PHFLE6/20/034103/1
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1070-6631 (print)   1089-7666 (online)
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