Feedback flow control of a three-dimensional wake behind a circular cylinder at a Reynolds number of Re = 100 was investigated. A combination of numerical simulations, experiments, and control theory was used to understand the flow field and to develop a sensor configuration, a flow state estimator, and a controller. The flow field was analysed by using proper orthogonal decomposition (POD) in two dimensions, and two-dimensional and three-dimensional sensor placements were investigated. The controller input was computed from the POD time coefficients, and actuation was performed by using rigid cylinder motion normal to the free stream. In the two-dimensional computations, feedback was shown to effectively reduce the drag and the fluctuating lift force. When feedback forcing was applied in the three-dimensional wake, both simulations and experiments showed that the vortex shedding could be controlled initially and the amplitude of the fluctuations decreased. However, span wise phase variations eventually appeared and rendered the controller ineffective.


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    Title :

    Feedback control of a circular cylinder wake


    Additional title:

    Rückkopplungskontrolle einer Wirbelstraße hinter einem Kreiszylinder


    Contributors:
    Seidel, J. (author) / Siegel, S. (author) / Fagley, C. (author) / Cohen, K. (author) / McLaughlin, T. (author)


    Publication date :

    2009


    Size :

    14 Seiten, 14 Bilder, 35 Quellen




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Feedback control of a circular cylinder wake

    Seidel, J. | Online Contents | 2009


    Feedback control of a circular cylinder wake

    Seidel, J / Siegel, S / Fagley, C et al. | SAGE Publications | 2009


    Eperimental Variable Gain Feedback Control of a Circular Cylinder Wake

    Siegel, Stefan / Cohen, Kelly / McLaughlin, Tom | AIAA | 2004


    Numerical Simulations of a Feedback-Controlled Circular Cylinder Wake

    Stefan Siegel / Kelly Cohen / Thomas McLaughlin | AIAA | 2006


    Simulations of three dimensional feedback control of a circular cylinder wake

    Seidel, Jurgen / Siegel, Stefan / Cohen, Kelly et al. | AIAA | 2006