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Experimental verification of an Oseen flow slender body theory

  • E. CHADWICK (a1), H. M. KHAN (a1), M. MOATAMEDI (a2), M. MAPPIN (a1) and M. PENNEY (a1)...
Abstract

Consider uniform flow past four slender bodies with elliptical cross-section of constant ellipticity along the length of 0, 0.125, 0.25 and 0.375, respectively, for each body. Here, ellipticity is defined as the ratio of the semiminor axis of the ellipse to the semimajor axis. The bodies have a pointed nose which gradually increases in cross-section with a radius of curvature 419 mm to a mid-section which then remains constant up to a blunt end section with semimajor axis diameter 160 mm, the total length of all bodies being 800 mm. The bodies are side-mounted within a low-speed wind tunnel with an operational wind speed of the order 30 m s−1. The side force (or lift) is measured within an angle of attack range of −3° to 3° such that the body is rotated about the major axis of the ellipse cross-section. The lift slope is determined for each body, and how it varies with ellipticity. It is found that this variance follows a straight line which steadily increases with increasing ellipticity. It is shown that this result is predicted by a recently developed Oseen flow slender body theory, and cannot be predicted by either inviscid flow slender body theory or viscous crossflow theories based upon the Allen and Perkins method.

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Corresponding author
Email address for correspondence: e.a.chadwick@salford.ac.uk
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H. M. Khan is also a permanent faculty member at College of Aeronautical Engineering, National University of Sciences and Technology (NUST), Pakistan

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References
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E. Chadwick 1998 The far field Oseen velocity expansion. Proc. R. Soc. A 454, 20592082.

E. Chadwick 2002 A slender-body theory in Oseen flow. Proc. R. Soc. A 458, 20072016.

E. Chadwick 2005 A slender wing theory in potential flow. Proc. R. Soc. A 461, 415432.

E. Chadwick 2009 A slender body theory in Oseen flow obtained by expanding the Oseenlets in the Green's integral representation. Fluid Dyn. Res. 41, 045508.

E. Chadwick & N. Fishwick 2007 Lift on slender bodies with elliptical cross-section evaluated by using an Oseen flow model. SIAM. J. Appl. Math 67 (5), 14651478.

M. J. Lighthill 1960 Note on the swimming of slender fish. J. Fluid Mech. 9, 305317.

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Journal of Fluid Mechanics
  • ISSN: 0022-1120
  • EISSN: 1469-7645
  • URL: /core/journals/journal-of-fluid-mechanics
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