Vortex Patterns in a Cross Flow Past a Cylinder Near the Channel Wall at Moderate Reynolds Numbers

Physical experiment and direct numerical simulation are employed to study a transitional flow of viscous fluid past a spanwise circular cylinder mounted near the wall of a rectangular channel. The Reynolds number varies in the range of 60 to 480. Spiraling tornado-like motion of fluid directed from...

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Bibliographic Details
Published in:Lobachevskii journal of mathematics 2021-07, Vol.42 (7), p.1715-1727
Main Authors: Mazo, Alexander, Molochnikov, Valeriy, Kalinin, Evgeniy, Paereliy, Anton, Dushin, Nickolay, Dushina, Olga
Format: Article
Language:English
Subjects:
Algebra
Analysis
Circular cylinders
Computational fluid dynamics
Cross flow
Direct numerical simulation
Drag coefficients
Fluid flow
Geometry
Karman vortex street
Mathematical Logic and Foundations
Mathematics
Mathematics and Statistics
Probability Theory and Stochastic Processes
Reynolds number
Tornadoes
Turbulent flow
Viscous fluids
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Summary:Physical experiment and direct numerical simulation are employed to study a transitional flow of viscous fluid past a spanwise circular cylinder mounted near the wall of a rectangular channel. The Reynolds number varies in the range of 60 to 480. Spiraling tornado-like motion of fluid directed from the sidewalls toward the center of the channel behind the cylinder is discovered. The evolution of this motion with the Reynolds number is outlined. Formation of large-scale vortical structures (analogue of Karman vortex street) and their turbulent breakdown in the cylinder wake are described. The behavior of the drag coefficient of the cylinder and the nearest wall with the Reynolds number is revealed.
ISSN:1995-0802
1818-9962
DOI:10.1134/S1995080221070179