Boundary Layer Profile - Wind tunnel No. 4 - Laboratory of Building- and Environmental Aerodynamics (see photographs)

 

The wind tunnel has a cross section of 2 m width and 1 m height, confined by smooth vertical walls and ceiling. 
In the test section, the ceiling is adjusted for zero pressure gradient in streamwise direction (dp/dx = 0).

 

Profile data of approaching flow
 
height velocity standard deviation   turbulence intensity I
z u σu σv σw tke Iu Iv Iw Iuvw
[m] [m/s] [m/s] [m/s] [m/s] [m2/s2] [%] [%] [%] [%]
0.005 1.79 1.07 0.63 0.61 0.96 60.0 35.2 34.1 44.7
0.010 2.20 1.09 0.77 0.76 1.17 49.3 35.0 34.5 40.2
0.015 2.49 1.15 0.83 0.81 1.34 46.2 33.4 32.5 37.9
0.020 2.71 1.18 0.79 0.75 1.29 43.5 29.2 27.9 34.3
0.025 2.90 1.16 0.75 0.71 1.20 40.0 25.7 24.4 30.9
0.030 3.05 1.13 0.71 0.66 1.10 36.9 23.2 21.6 28.1
0.040 3.35 1.04 0.69 0.58 0.94 31.0 20.7 17.2 23.7
0.050 3.57 1.00 0.66 0.60 0.90 28.0 18.5 16.7 21.6
0.080 4.11 0.99 0.63 0.60 0.87 24.1 15.3 14.6 18.5
0.100 4.39 0.98 0.65 0.59 0.86 22.4 14.7 13.4 17.3
0.130 4.75 0.90 0.61 0.57 0.75 18.9 12.8 12.1 14.9
0.160 5.06 0.85 0.59 0.54 0.68 16.7 11.6 10.7 13.3
0.190 5.33 0.82 0.58 0.54 0.65 15.4 10.8 10.2 12.4
0.230 5.64 0.75 0.55 0.50 0.56 13.2 9.7 8.9 10.8
0.270 5.92 0.68 0.51 0.48 0.47 11.5 8.5 8.2 9.5
0.320 6.23 0.62 0.51 0.44 0.42 10.0 8.1 7.1 8.5
0.370 6.51 0.56 0.48 0.41 0.36 8.6 7.3 6.3 7.5
0.420 6.76 0.50 0.45 0.39 0.30 7.4 6.7 5.7 6.6
0.470 6.99 0.50 0.39 0.37 0.27 7.2 5.6 5.3 6.1
0.520 7.02 0.42 0.36 0.37 0.22 6.0 5.1 5.3 5.5