0.8
CEDVAL
x/H
0.6
0.4
50
Dimensionless concentration K
100
150
0
200
y/H=−0.32
1
0.8
x/H
0.6
0.4
50
Dimensionless concentration K
100
150
0
200
y/H=−0.16
1
0.8
x/H
0.6
0.4
50
Dimensionless concentration K
100
150
0
200
y/H=0
1
winward
2
1.5
x [H]
2d flow measurements, y = 0H
2 m/s
0.5
−0.5
0
0.5
side wall of the tunnel
b
a
d
c
source building
all dimensions in mm (model scale)
wind direction
top view
850
100
750
100
325
z [H]
1.5
1
1
0
middle
leeward
10
Dimensionless concentration K
0
y/H
−0.6
−0.5
−0.4
−0.3
−0.2
−0.1
0
20
10
Dimensionless concentration K
0
y/H
−0.6
−0.5
−0.4
−0.3
−0.2
−0.1
0
20
200
Dimensionless concentration K
0
y/H
−0.6
−0.5
−0.4
−0.3
−0.2
−0.1
0
400
CFD Sc
t
=0.7
CFD Sc
t =0.4
Urban Air Quality: Meteorological Processes, Fig. 6
(a) Sketch of the regular
building array with indication of the source building. (b) Velocity vectors obtained from
wind tunnel experiments showing the vortex inside the canyon downwind of the source
building. (c) Velocity vectors obtained from CFD simulations. (d) Concentration profiles at different positions within the same street canyon with a sensitivity to the Schmidt
number value
184
Urban Air Quality: Meteorological Processes