Visualization and modal decomposition of vortex street behind circular cylinder
CTU in Prague, FME, Department of Fluid Dynamics and Thermodynamics, Technická 4, 166 07, Prague
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Time resolved particle image velocimetry measurement of vortex street behind circular cylinder was carried out. Vorex street was measured for Reynolds numbers up to few thousands. Obtained results were processed by visualizations of moving particles and by standard evaluation of vector fields from the set of images. Modal decomposition of measured flow field was done using propper orthogonal decomposition where the structure of energetically most important modes was identified for several Reynolds numbers. The values of Strouhal number was analyzed from temporal evolution of dominant modes obtained using proper orthogonal decomposition.
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