Author:
KRANE M. H.,GREGA L. M.,WEI T.
Abstract
Measurements of the near-wall velocity field of the flow over cylinders aligned with a uniform flow are presented. The broader objective of this investigation was to quantify and understand the role of transverse curvature in the limit as cylinder diameter approaches zero. The specific goal was to begin with a turbulent boundary layer over a larger radius cylinder and see what happens as the radius is reduced. Spatially and temporally resolved digital particle image velocimetry (DPIV) measurements were made on three different radius cylinders, 0.14 cm ≤ a ≤ 3.05 cm, extending along the length of a large free-surface water tunnel. Mean and fluctuating profiles are presented at a fixed streamwise location and free-stream speed. For the first time, spatially resolved measurements were made very close to the wall, permitting direct determination of wall shear stress, i.e. uτ, from near-wall velocity profiles. The measurements revealed a region close to the wall for small radii where the mean streamwise velocity profile is inflectional. This has significant implications on assumptions regarding what happens in the limit of a vanishing cylinder radius.
Publisher
Cambridge University Press (CUP)
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics
Cited by
7 articles.
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1. Universal law of skin-friction coefficient in a fully developed zero pressure gradient axisymmetric turbulent boundary layer flow;Journal of Fluid Mechanics;2023-10-31
2. Static Pressure Distribution on Long Cylinders as a Function of the Yaw Angle and Reynolds Number;Fluids;2021-04-22
3. A review of transverse curvature effect on friction force and leading-edge flow;Ocean Engineering;2020-12
4. Analysis of axisymmetric boundary layers;Journal of Fluid Mechanics;2018-06-26
5. Discussions: (1) “On the Axisymmetric Turbulent Boundary Layer Growth Along Long Thin Circular Cylinders,” (Jordan, S. A., 2014, ASME J. Fluids Eng., 136(5), p. 051202) and (2) “Understanding Tow Tank Measurements of Total Drag for Long Thin Circular Cylinders,” (Jordan, S. A., 2014, ASME J. Fluids Eng., 136(3), p. 031205);Journal of Fluids Engineering;2015-03-01