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      Investigation of a Near-Field Cylinder Wake in the Subsonic, Transonic, and Supersonic Regimes

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          Abstract

          The near wake of a circular cylinder in a high-Reynolds-number regime is investigated using the particle image velocimetry technique for an inflow Mach number spanning 0.3 to 2. The mean flow and turbulent kinetic energy field for different Mach number cases are presented. Furthermore, the influence of the Reynolds and Mach number effects is examined based on the mean separation point along the cylinder surface, which is extracted from complementary schlieren visualization measurements, and the literature. The wake width for the supersonic inflow case is found to be an order of magnitude smaller physically than the subsonic case with an identical cylinder diameter. Additionally, the swirl strength criterion is used to identify the eddies present within the wake, and the eddy size and convection velocity are characterized based on the spatiotemporal correlations. The result suggests that the mean wake features for the subsonic and supersonic cases are very different. Moreover, the interaction of eddies generated at the cylinder’s top and bottom shear layers leads to the large-scale features present in the wake, and the differing paths followed by the eddies between the subsonic and supersonic cases are responsible for the variation in the observed wake width.

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          Mechanisms for generating coherent packets of hairpin vortices in channel flow

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            Universal outlier detection for PIV data

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              Analysis and interpretation of instantaneous turbulent velocity fields

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                Author and article information

                Contributors
                Journal
                aiaaj
                AIAA Journal
                AIAA Journal
                American Institute of Aeronautics and Astronautics
                1533-385X
                09 October 2023
                December 2023
                : 61
                : 12
                : 5415-5428
                Affiliations
                University of the Bundeswehr Munich , 85577 Neubiberg, Germany
                University of New South Wales , Sydney, New South Wales 2052, Australia
                University of the Bundeswehr Munich , 85577 Neubiberg, Germany
                Author notes
                [*]

                Postdoctoral Researcher, Department of Aerospace Engineering; rio.baidya@ 123456unibw.de (Corresponding Author).

                [†]

                Senior Researcher, Department of Aerospace Engineering.

                [‡]

                Senior Lecturer, School of Mechanical and Manufacturing Engineering.

                [§]

                Associate Lecturer, School of Mechanical and Manufacturing Engineering.

                [¶]

                Professor, Department of Aerospace Engineering.

                Author information
                https://orcid.org/0000-0002-6148-602X
                Article
                J063163 J063163
                10.2514/1.J063163
                101e7f1b-b3bf-4e72-9015-4e1650255571
                Copyright © 2023 by the authors. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission. All requests for copying and permission to reprint should be submitted to CCC at www.copyright.com; employ the eISSN 1533-385X to initiate your request. See also AIAA Rights and Permissions www.aiaa.org/randp.
                History
                : 08 May 2023
                : 22 July 2023
                : 29 July 2023
                Page count
                Figures: 20, Tables: 2
                Funding
                Funded by: Deutsche Forschungsgemeinschafthttp://dx.doi.org/10.13039/501100001659
                Award ID: Research Grant / 448354709
                Funded by: Deutscher Akademischer Austauschdiensthttp://dx.doi.org/10.13039/501100001655
                Award ID: 57509287
                Categories
                p2263, Fluid Dynamics
                p1804, Aerodynamics
                p1973, Vortex Dynamics
                p1976, Flow Regimes
                p3749, Turbulence
                p16684, Velocimetry
                p2228, Aerospace Sciences
                p2073, Aeronautics
                Regular Articles

                Engineering,Physics,Mechanical engineering,Space Physics
                Transonic Flow,Particle Image Velocimetry,Shear Flow,Turbulence Intensity,Outer Flow Velocity,Flow Conditions,Karman Vortex Street,Reynolds Number,Subsonic Flow,Supersonic Flow

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