Selected Statistical Properties in the Inner Region of a Transpired Turbulent Boundary Layer

AIAA Journal ◽  
1973 ◽  
Vol 11 (12) ◽  
pp. 1758-1760
Author(s):  
L. K. ISAACSON ◽  
R. L. PETERSON
Keyword(s):  
Boundary Layer ◽  
Turbulent Boundary Layer ◽  
Statistical Properties ◽  
Inner Region

Modification of Near-Wall Structure in a Shear-Driven 3-D Turbulent Boundary Layer

2001 ◽  
Vol 124 (1) ◽  
pp. 118-126 ◽  
Author(s):  
Robert O. Kiesow ◽  
Michael W. Plesniak
Keyword(s):  
Boundary Layer ◽  
Turbulent Boundary Layer ◽  
Reynolds Shear Stress ◽  
Power Spectra ◽  
Streamwise Velocity ◽  
Wall Structure ◽  
Reynolds Stresses ◽  
Planar Shear ◽  
Inner Region ◽  
Near Wall

The near-wall physics of a planar, shear-driven, 3-D turbulent boundary layer with varying strengths of crossflow are examined. Flow visualization data reveals a reduction of mean streak length by as much as 50% with increasing spanwise shear. Power spectra of velocity confirm this shift towards higher temporal frequencies, corresponding to decreased streamwise length scales. PIV measurements indicate a significant modification of the inner region of the boundary layer with increasing spanwise shear. Streamwise velocity profiles exhibit an increasing velocity deficit with increased crossflow. Increased levels of the normal Reynolds stresses u′2¯ and v′2¯ and an increase in the −u′v′¯ Reynolds shear stress are also observed. Modifications in the spanwise and transverse vorticity were also observed at higher shear rates.

Statistical properties of the atmospheric turbulent boundary layer over steep surface waves

2010 ◽  
Vol 433 (1) ◽  
pp. 922-926 ◽  
Author(s):  
Yu. I. Troitskaya ◽  
D. A. Sergeev ◽  
O. S. Ermakova ◽  
G. N. Balandina
Keyword(s):  
Boundary Layer ◽  
Turbulent Boundary Layer ◽  
Surface Waves ◽  
Statistical Properties

scholarly journals Effects of the Cylinder Wake in a Freestream on Statistical Properties of a Turbulent Boundary Layer

2013 ◽  
Vol 79 (799) ◽  
pp. 291-303 ◽  
Author(s):  
Kousuke HIRUTA ◽  
Kouji NAGATA ◽  
Yasuhiko SAKAI ◽  
Hiroki SUZUKI ◽  
Osamu TERASHIMA
Keyword(s):  
Boundary Layer ◽  
Turbulent Boundary Layer ◽  
Statistical Properties ◽  
Cylinder Wake

Effect of Upstream Shear on Flow and Heat (Mass) Transfer Over a Flat Plate

2008 ◽  
Author(s):  
Kalyanjit Ghosh ◽  
R. J. Goldstein
Keyword(s):  
Boundary Layer ◽  
Mass Transfer ◽  
Reynolds Number ◽  
Turbulent Boundary Layer ◽  
Flow Direction ◽  
Velocity Ratio ◽  
Leading Edge ◽  
Surface Velocity ◽  
Freestream Velocity ◽  
Inner Region

A parametric study is conducted to investigate the effect of wall shear on a two-dimensional turbulent boundary layer. The shear is imparted by a moving belt, flush with the wall, translating in the flow direction. Velocity and mass transfer experiments have been performed for four surface-to-freestream velocity ratios (0, 0.38, 0.52, 0.65) with a Reynolds number based on the momentum thickness between 770 and 1776. The velocity data indicate that the location of the ‘virtual origin’ of the turbulent boundary layer ‘moves’ downstream towards the trailing edge of the belt with increasing surface velocity. The highest velocity ratio represents a case which is responsible for the removal of the inner region of the boundary layer. Mass transfer measurements downstream of the belt show the presence of a local minimum in the variation of the Stanton vs. Reynolds number for the highest velocity ratio. Downstream of this minimum, approximately 1 cm from the leading edge of the mass transfer plate, the characteristics of the turbulent boundary layer are restored and the data fall back on the empirical variation of the Stanton number with Reynolds number.

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