Determination of the eulerian longitudinal integral length scale in a turbulent boundary layer

1975 ◽  
Vol 31 (5) ◽  
pp. 397-399 ◽  
Author(s):  
P. J. H. Builtjes
Keyword(s):  
Boundary Layer ◽  
Turbulent Boundary Layer ◽  
Integral Length Scale ◽  
Length Scale

scholarly journals Wind and turbulence profiles in a simulated wind tunnel boundary layer

MAUSAM ◽  
2021 ◽  
Vol 43 (3) ◽  
pp. 283-290
Author(s):  
S. SIVARAMAKRISHNAN
Keyword(s):  
Boundary Layer ◽  
Surface Layer ◽  
Wind Tunnel ◽  
Turbulent Boundary Layer ◽  
Atmospheric Surface Layer ◽  
Length Scale ◽  
Laboratory Modeling ◽  
Tunnel Floor ◽  
Short Test ◽  
Simulated Wind

A system of Honeycomb Flat Plate (HFP) grid and cylindrical rods has been developed to accelerate the growth of a thick (32 cm) turbulent boundary layer, artificially, over rough floor of a low speed short test-section (0.61 m x 0.61 m) wind tunnel. Simulated profiles of wind velocity, longitudinal turbulence intensity and Reynolds stress are shown to have similarity to those of a neutral atmospheric boundary layer over a typical rural terrain. Longitudinal spectrum of turbulence measured at 10,30 and 100 mm above tunnel floor is shown to compare well with atmospheric spectrum and agree closely with the Kolmogoroff's -2/3 law in the inertial sub-range of the spectrum. Based on the length scale of longitudinal turbulence estimated from the spectrum, a scale of 1 :900 has been proposed for laboratory modeling of environmental problems wherein the transport of mass in a neutral atmospheric surface layer IS solely due to eddies of mechanical origin.

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