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BBVIV5a - Konstantinidis

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Numerical study of the effect of velocity perturbations on the mechanics of vortex shedding in synchronized bluff-body wakes
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  Numerical study of the effect of velocity perturbations on the mechanics of vortex shedding in synchronized bluff-body wakes S. BALABANI 1 E.KONSTANTINIDIS 1,2 C. LIANG 3 G. PAPADAKIS 1 1 Department of Mechanical Engineering, King’s College London, WC2R 2LS, UK 2 Department of Engineering and Management of Energy Resources, University of Western Macedonia, Kozani50100, Greece 3 Department of Mathematics, University of Glasgow, Glasgow G12 8QW, UK   Outline  Background and motivation  Computational details  Comparison with experiments  Observations from a typical simulation  Effect of excitation frequency  Summary and remarks  Wake and vortex shedding control by periodic excitations  Rectilinear cylinder oscillations  Rotational cylinder oscillations  Flow pulsation   Acoustic forcing   Vibration of control rod in wake  Surface suction/blowing  Surface modulation/deformationQuestion: are there any universal features among the different methods?  Flow configuration 0.21/ om  fUd  ≅ ⋅ Inflow with superimposed periodic velocity oscillationsCircular cylinder perpendicular to the oncoming flow ()sin(2 π ) me UtUUft  = +∆ Main parameters: 2 π em U  Dfd U U  ∆=∆ *0 ee U U  fd  f  f  = UD Re  ρ µ  =
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