scholarly journals Vortex Street from a Circular Cylinder in a Laminar Boundary Layer.

1994 ◽  
Vol 42 (490) ◽  
pp. 657-664
Author(s):  
Kazuo MURAOKA ◽  
Masaaki NISHIYAMA
Keyword(s):  
Boundary Layer ◽  
Circular Cylinder ◽  
Laminar Boundary Layer ◽  
Vortex Street

Formation of Vortex Street in Laminar Boundary Layer

1980 ◽  
Vol 47 (2) ◽  
pp. 227-233 ◽  
Author(s):  
M. Kiya ◽  
M. Arie
Keyword(s):  
Boundary Layer ◽  
Shear Flow ◽  
Laminar Boundary Layer ◽  
Solid Wall ◽  
Vortex Sheet ◽  
Vortex Street ◽  
Bluff Bodies ◽  
Uniform Shear ◽  
Uniform Shear Flow ◽  
Vortex Patterns

Main features of the formation of vortex street from free shear layers emanating from two-dimensional bluff bodies placed in uniform shear flow which is a model of a laminar boundary layer along a solid wall. This problem is concerned with the mechanism governing transition induced by small bluff bodies suspended in a laminar boundary layer. Calculations show that the background vorticity of shear flow promotes the rolling up of the vortex sheet of the same sign whereas it decelerates that of the vortex sheet of the opposite sign. The steady configuration of the conventional Karman vortex street is not possible in shear flow. Theoretical vortex patterns are experimentally examined by a flow-visualization technique.

scholarly journals Reducing Drag of Body by Adding a Plate

2018 ◽  
Vol 220 ◽  
pp. 07002 ◽  
Author(s):  
A. Frolov Vladimir ◽  
S. Kozlova Anna
Keyword(s):  
Boundary Layer ◽  
Circular Cylinder ◽  
Flat Plate ◽  
Laminar Boundary Layer ◽  
Separation Point ◽  
Theoretical Investigations

This paper focuses on theoretical investigations of the location of a separation point laminar boundary layer on the surface of a circular cylinder. The investigations were carried out by CFD software FlowSimulation. The displacement of the separation point on the surface of the circular cylinder is achieved by installing a flat plate in front of the cylinder parallel to the flow. It was found that the greatest displacement of the separation point to the back of the cylinder is possible when the chord of the plate equals to a quarter of the diameter of the circular cylinder. The flat plate allows not only to change the position of the separation point but also to reduce the drag by about 25%.

B13 Junction Flow of Circular Cylinder and Flat Wall with Laminar Boundary Layer

2009 ◽  
Vol 2009.62 (0) ◽  
pp. 47-48
Author(s):  
Hidemi YAMADA ◽  
Eigo HAYASHI ◽  
Akio SATOH ◽  
Syunji YOSHINO
Keyword(s):  
Boundary Layer ◽  
Circular Cylinder ◽  
Laminar Boundary Layer ◽  
Flat Wall ◽  
Junction Flow
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