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Relaminarization of Re-tau=100 turbulence using gain scheduling and linear state-feedback control
KTH, Superseded Departments, Mechanics.ORCID iD: 0000-0001-7864-3071
2003 (English)In: Physics of fluids, ISSN 1070-6631, E-ISSN 1089-7666, Vol. 15, no 11, 3572-3575 p.Article in journal (Refereed) Published
Abstract [en]

The first successful application of linear full-state feedback optimal control theory to consistently relaminarize turbulent channel flow at Re-tau=100 with full state information and gain scheduling is reported. The actuation is zero-net mass-flux blowing and suction on the channel walls. Two key issues central to the success of this strategy are: (a) the choice of the mean-flow profile about which the equations are linearized for the computation of the linear feedback gains, and (b) the choice of an objective function which targets the control effort on the flow perturbations of interest. A range of mean-flow profiles between the laminar and fully turbulent profiles and a weighted energy measure which targets flow perturbations in the near-wall region were found to provide effective feedback gains. A gain-scheduling strategy to tune the feedback gains to the nonstationary mean-flow profile is introduced, resulting in consistent relaminarization of the turbulent flow in all realizations tested.

Place, publisher, year, edition, pages
2003. Vol. 15, no 11, 3572-3575 p.
Keyword [en]
poiseuille flow, drag reduction, active control, channel flow, transition, systems, wall
URN: urn:nbn:se:kth:diva-22881DOI: 10.1063/1.1608939ISI: 000185865700030OAI: diva2:341579
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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