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Strouhal number universality in high-speed cylinder wake flows

Thasu, PS and Duvvuri, S (2022) Strouhal number universality in high-speed cylinder wake flows. In: Physical Review Fluids, 7 (8).

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Official URL: https://doi.org/10.1103/PhysRevFluids.7.L081401


Flow oscillations in the near-wake region of a two-dimensional circular cylinder are experimentally investigated at Mach 6 over the Reynolds number range 2.3×105 to 5×105. The oscillation frequency is obtained by spectral proper orthogonal decomposition of high-speed schlieren data. The Strouhal number based on the length of the near-wake shear layers is found to exhibit universal behavior. This corroborates experimental findings at Mach 4 from recent literature, and furthermore, the universal behavior is also seen to hold with respect to Mach number. Time-resolved pressure measurements at the flow separation points on the cylinder aft surface show that coherent oscillatory activity occurs with a phase difference of π radians between the two statistically symmetric halves of the flow. This aspect of the flow dynamics at high speeds is in common with its low-speed counterpart, i.e., the canonical problem of the cylinder wake in an incompressible flow.

Item Type: Journal Article
Publication: Physical Review Fluids
Publisher: American Physical Society
Additional Information: The copyright for this article belongs to American Physical Society.
Keywords: Circular cylinders; Flow separation; Incompressible flow; Principal component analysis; Reynolds number; Wakes, Cylinder wake; Flow oscillations; High Speed; High-speed cylinder; Near wake; Reynold number; Two-dimensional; Universal behaviors; Wake flows; Wake region, Strouhal number
Department/Centre: Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited: 12 Oct 2022 10:13
Last Modified: 12 Oct 2022 10:13
URI: https://eprints.iisc.ac.in/id/eprint/77299

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