Flow around a confined cylinder
LES and PIV study
E. Palkin (Russian Academy of Sciences, Novosibirsk State University)
Mikhail Shestakov (Novosibirsk State University, Russian Academy of Sciences)
Dmitry Markovich (Russian Academy of Sciences, Novosibirsk State University)
K. Hanjalic (TU Delft - ChemE/Transport Phenomena, Novosibirsk State University)
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Abstract
We study the flow over a cylinder placed between two parallel rigid walls using Large-eddy simulations and Particle Image Velocimetry. The Reynolds number based on the inflow velocity and diameter of the cylinder is 3750 corresponding to the subcritical regime with laminar separation. Three-dimensional visualization shows the presence of the horseshoe vortex system prior to the cylinder. The comparison of time-averaged velocity fields and fluctuations shows good agreement between simulations and experiments. Spectral analysis suggests the presence of low-frequency modulations of the recirculating bubble.
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