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.
Highlights
Flows over obstacles in a duct are common in many engineering applications such as cooling systems, bridge piers, heat exchangers, building sections, junctions in wing-body and turbine blade-rotor systems, among others
In such configurations a horseshoe vortex system appears prior to a bluff body increasing the local shear stress and heat transfer [1] while the flow is characterized by periodic shedding of large-scale vortices behind the body that form the Kármán vortex street
Low-frequency modulations of the recirculating zone are detected for various configurations such as a cylinder [2, 3], disk and sphere [4], prism [5], bullet [6], among others
Summary
Flows over obstacles in a duct are common in many engineering applications such as cooling systems, bridge piers, heat exchangers, building sections, junctions in wing-body and turbine blade-rotor systems, among others. In such configurations a horseshoe vortex system appears prior to a bluff body increasing the local shear stress and heat transfer [1] while the flow is characterized by periodic shedding of large-scale vortices behind the body that form the Kármán vortex street. Low-frequency modulations of the recirculating zone are detected for various configurations such as a cylinder [2, 3], disk and sphere [4], prism [5], bullet [6], among others. In the present work we consider a flow over confined cylinder in a narrow rectangular duct to investigate the effect of walls on the dynamics of the recirculation bubble
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