Vorticity POD Modes for Low-Order Modeling of Synthetic-Jet Actuated Flow Past a NACA 4415 Airfoil Undergoing Time-Periodic Pitching Motion

ORAL

Abstract

We describe construction of two-dimensional modes by proper orthogonal decomposition (POD) of velocity and vorticity data obtained by two-component PIV measurements in turbulent flow past a NACA 4415 airfoil undergoing time-periodic pitching motion due to synthetic-jet actuation near the trailing edge. We show how modes constructed using nonsimultaneous data on adjacent spatial windows can be ``stitched together'' to produce nonoptimal (i.e., not POD) modes, that can be used to reconstruct phase-averaged data taken nonsimultaneously in the two windows. The use of ``globalized'' vorticity modes stitched together from nonsimultaneous data in low-order modeling for feedback control is also discussed.

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Authors

  • Guy Ben-Dov

    Department of Mechanical Science \& Engineering, University of Illinois at Urbana-Champaign

  • Arne J. Pearlstein

    Department of Mechanical Science \& Engineering, University of Illinois at Urbana-Champaign

  • Daniel Brzozowski

    School of Mechanical Engineering, Georgia Institute of Technology, Georgia Institute of Technology

  • Ari Glezer

    School of Mechanical Engineering, Georgia Institute of Technology