NDLI: On the Characteristics of the Super-Critical Wake behind a Circular Cylinder

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On the Characteristics of the Super-Critical Wake behind a Circular Cylinder

Content Provider	MDPI
Author	Rodriguez, Ivette Lehmkuhl, Oriol
Copyright Year	2021
Description	The flow topology of the wake behind a circular cylinder at the super-critical Reynolds number of $Re=7.2\times105$ is investigated by means of large eddy simulations. In spite of the many research works on circular cylinders, there are no studies concerning the main characteristics and topology of the near wake in the super-critical regime. Thus, the present work attempts to fill the gap in the literature and contribute to the analysis of both the unsteady wake and the turbulent statistics of the flow. It is found that although the wake is symmetric and preserves similar traits to those observed in the sub-critical regime, such as the typical two-lobed configuration in the vortex formation zone, important differences are also observed. Owing to the delayed separation of the flow and the transition to turbulence in the attached boundary layer, Reynolds stresses peak in the detached shear layers close to the separation point. The unsteady mean flow is also investigated, and topological critical points are identified in the vortex formation zone and the near wake. Finally, time-frequency analysis is performed by means of wavelets. The study shows that in addition to the vortex shedding frequency, the inception of instabilities that trigger transition to turbulence occurs intermittently in the attached boundary layer and is registered as a phenomenon of variable intensity in time.
Starting Page	396
e-ISSN	23115521
DOI	10.3390/fluids6110396
Journal	Fluids
Issue Number	11
Volume Number	6
Language	English
Publisher	MDPI
Publisher Date	2021-11-03
Access Restriction	Open
Subject Keyword	Fluids Marine Engineering Les Circular Cylinder Super-critical Regime Wake Topology
Content Type	Text
Resource Type	Article

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