Conference Publications

[176571]
Title: Robust transition control in non-periodic channels.
Written by: Chughtai, Saulat S. and Werner, Herbert
in: <em>48th IEEE Conference on Decision and Control</em>. (2009).
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on pages: 8278--8283
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Abstract: This paper presents the controller synthesis of a network of local robust controllers for the purpose of controlling the transition from laminar to turbulent ow in non-periodic channels, using a recently proposed spatially interconnected model of plane Poiseuille ow for Re = 2000. Measured feedback signals used by the controllers are the local changes in wall shear force, and the generated control action is a local change in uid wall normal velocities. Thus, in contrast to most previously proposed control schemes which operate in Fourier domain, this approach works in physical domain. In order to synthesize this controller, rst uncertainties are estimated by nding the relative error between the measurements obtained from linearized and non-linear models. For this purpose a non-linear simulation environment is developed in FLUENT software. Once these uncertainties are estimated in frequency domain, a low order spatially interconnected weighting function is found. The closed loop response shows that the controller attenuates oscillations generated by an impulsive disturbance.

[176571]
Title: Robust transition control in non-periodic channels.
Written by: Chughtai, Saulat S. and Werner, Herbert
in: <em>48th IEEE Conference on Decision and Control</em>. (2009).
Volume: Number:
on pages: 8278--8283
Chapter:
Editor:
Publisher:
Series:
Address:
Edition:
ISBN:
how published:
Organization:
School:
Institution:
Type:
DOI:
URL:
ARXIVID:
PMID:

Note:

Abstract: This paper presents the controller synthesis of a network of local robust controllers for the purpose of controlling the transition from laminar to turbulent ow in non-periodic channels, using a recently proposed spatially interconnected model of plane Poiseuille ow for Re = 2000. Measured feedback signals used by the controllers are the local changes in wall shear force, and the generated control action is a local change in uid wall normal velocities. Thus, in contrast to most previously proposed control schemes which operate in Fourier domain, this approach works in physical domain. In order to synthesize this controller, rst uncertainties are estimated by nding the relative error between the measurements obtained from linearized and non-linear models. For this purpose a non-linear simulation environment is developed in FLUENT software. Once these uncertainties are estimated in frequency domain, a low order spatially interconnected weighting function is found. The closed loop response shows that the controller attenuates oscillations generated by an impulsive disturbance.