scholarly journals Effect of Aspect Ratio on Vortices Shedding from Circular Cylinder of Finite Length Placed on la Ground Plane.

1991 ◽  
Vol 57 (537) ◽  
pp. 1586-1591
Author(s):  
Shiki OKAMOTO ◽  
Yukisada SUNABASHIRI ◽  
Masato INOUE
Keyword(s):  
Aspect Ratio ◽  
Circular Cylinder ◽  
Finite Length ◽  
Ground Plane

scholarly journals Near Wake behind Circular Cylinder of Finite Length on Ground Plane.

1997 ◽  
Vol 63 (613) ◽  
pp. 2923-2929
Author(s):  
Shiki OKAMOTO ◽  
Kazumi TSUNODA ◽  
Eiji OKADA ◽  
Junichi FUJITA
Keyword(s):  
Circular Cylinder ◽  
Finite Length ◽  
Ground Plane ◽  
Near Wake

scholarly journals Dynamics of the Tip Vortices in the Wake Behind a Circular Cylinder of Finite Length

2020 ◽  
Vol 328 ◽  
pp. 05008
Author(s):  
Václav Uruba ◽  
Pavel Procházka
Keyword(s):  
Circular Cylinder ◽  
Finite Length ◽  
Ground Plane ◽  
Cross Flow ◽  
Cylinder Axis ◽  
Thin Boundary Layer ◽  
Time Resolved ◽  
Vortical Structures ◽  
Tip Vortices ◽  
Piv Technique

The dynamics of the tip vortices in the wake behind a wall-mounted finite-length circular cylinder of the aspect ratio 2 was studied experimentally using time resolved stereo PIV technique. The cylinder was mounted normal to a ground plane and it was subjected to a cross-flow with thin boundary layer developed on the wall, the Reynolds number based on inflow velocity and cylinder diameter was 9.7 thousands. The dynamics of tip vortices were analysed using the POD method applied to the plane perpendicular to the flow close to the cylinder. Besides the decaying power spectrum, slower that the Kolmogorov-type one, the two distinct frequencies were detected on Strouhal numbers 0.09 and 0.15. These frequencies could be linked to the vortical structures dynamics in the wake. The frequency Sh = 0.15 corresponds to predominantly spanwise vortices dynamics with anti-symmetrical patterns with respect to the cylinder axis, while the frequency Sh = 0.09 corresponds to mainly streamwise vortical structures dynamics with symmetrical patterns respectively. Thus, the von Kármán vortex street was detected on Strouhal frequency 0.15.

Vortex Shedding From a Circular Cylinder of Finite Length Placed on a Ground Plane

1992 ◽  
Vol 114 (4) ◽  
pp. 512-521 ◽  
Author(s):  
Shiki Okamoto ◽  
Yukisada Sunabashiri
Keyword(s):  
Aspect Ratio ◽  
Circular Cylinder ◽  
Vortex Shedding ◽  
Ground Plane ◽  
Vortex Formation ◽  
Turbulent Wake ◽  
Blow Down ◽  
Space Correlation ◽  
Pressure Distributions ◽  
Correlation Space

This paper describes a study of changes in the vortex formation and the turbulent wake from a circular cylinder with a finite aspect ratio, placed on a ground plane. The experiment was carried out in an N.P.L. blow down type wind-tunnel, with a working section of 500 mm × 500 mm × 2,000 mm, and between the Reynolds number 2.5 × 104 and 4.7 × 104. The surface-pressure distributions on the circular cylinder were measured and the drag coefficient was determined from these measurements. Vortices of two kinds generated in the flow-field around the cylinder were observed. The power spectrum, auto-correlation, space-correlation, velocity defects, and turbulent intensities in the turbulent wake behind a circular cylinder were also measured. It was found that the flow pattern changed rapidly above aspect ratio H/D = 4, with vortex shedding changing from symmetric “arch” type to antisymmetric “Karman” type.

scholarly journals Aerodynamics of a Circular Cylinder of Finite Length

1988 ◽  
Vol 1988 (36) ◽  
pp. 27-43
Author(s):  
Yasushi UEMATSU ◽  
Motohiko YAMADA ◽  
Kaoru ISHII
Keyword(s):  
Circular Cylinder ◽  
Finite Length

The Circular Cylinder With a Band of Uniform Pressure on a Finite Length of the Surface

1941 ◽  
Vol 8 (3) ◽  
pp. A97-A104 ◽  
Author(s):  
M. V. Barton
Keyword(s):  
Circular Cylinder ◽  
Finite Length ◽  
Infinite Series ◽  
Fundamental Problem ◽  
The Other ◽  
Complete Picture ◽  
Uniform Pressure ◽  
Uniform Tension ◽  
Special Cases ◽  
Stress And Deformation

Abstract The solution to the fundamental problem of a cylinder with a uniform pressure over one half its length and a uniform tension on the other half is found by using the Papcovitch-Neuber solution to the general equations. In this paper, the results, given analytically in terms of infinite-series expressions, are exhibited as curves giving a complete picture of the stress and deformation. The case of a cylinder with a band of uniform pressure of any length, with the exception of very small ones, is then solved by the method of superposition. The stresses and displacements are evaluated for the special cases of a cylinder with a uniform pressure load of 1 diam and 1/2 diam in length. The problem of a cylinder heated over one half its length is solved by the same means.

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