On large streamwise structures in a wall jet flowing over a circular cylinder

2004 ◽  
Vol 16 (7) ◽  
pp. 2158-2169 ◽  
Author(s):  
R. Neuendorf ◽  
L. Lourenco ◽  
I. Wygnanski
Keyword(s):  
Circular Cylinder ◽  
Wall Jet ◽  
Streamwise Structures

scholarly journals The Wall Jet on a Circular Cylinder Immersed in Uniform Flow

1973 ◽  
Vol 39 (328) ◽  
pp. 3669-3677
Author(s):  
Takefumi IKUI ◽  
Masahiro INOUE ◽  
Kazuaki SHIRAMOTO ◽  
Yukitoshi NAKASHIMA ◽  
Hideki OHBA
Keyword(s):  
Circular Cylinder ◽  
Uniform Flow ◽  
Wall Jet

scholarly journals Turbulent structure of a plane wall jet disturbed by a circular cylinder.

1989 ◽  
Vol 55 (517) ◽  
pp. 2694-2701
Author(s):  
Hideo OSAKA ◽  
Shinsuke MOCHIZUKI ◽  
Tsunenori SATO
Keyword(s):  
Circular Cylinder ◽  
Turbulent Structure ◽  
Plane Wall ◽  
Wall Jet

On a turbulent wall jet flowing over a circular cylinder

1999 ◽  
Vol 381 ◽  
pp. 1-25 ◽  
Author(s):  
R. NEUENDORF ◽  
I. WYGNANSKI
Keyword(s):  
Circular Cylinder ◽  
Surface Pressure ◽  
Angular Position ◽  
Adverse Pressure Gradient ◽  
Radius Of Curvature ◽  
Wall Jet ◽  
Mean Flow ◽  
Potential Core ◽  
Rate Of Spread ◽  
Turbulent Wall

The effect of surface curvature on the development of a two-dimensional wall jet was investigated experimentally. A comparison was made between a wall jet flowing around a circular cylinder and its plane equivalent. Velocity surveys and surface pressure measurements in the curved wall jet suggest the existence of two primary regions of interest. The first region, ranging from the end of the potential core to an approximate angular position of θ=120°, is characterized by a constant surface pressure and a self similarity of the mean flow. The second region is marked by an adverse pressure gradient leading to separation around θ=230°. The rate of spread of this flow, even in the initial region, is much higher than in the plane wall jet and so are the levels of turbulence and Reynolds stress. The dominant lengthscale in this flow is the radius of curvature R and the dominant velocity scale is the square root of the kinematic jet momentum divided by the radius of curvature. Entrainment of ambient fluid which causes the jet to adhere to the curved surface is also the main reason for its separation which is preceded by a rapid rate of spread of the flow leading to the failure of the boundary-layer approximation.

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