# Square duct, two roughened opposite walls
# 
#   U3/Us   x100
#
#     X3/B= 0    -0.1    -0.2    -0.3    -0.4    -0.5    -0.6    -0.7    -0.8    -0.9
# X2/B
  0      -0.15   -0.36   -0.91   -1.00   -1.24   -1.62   -1.58   -2.30   -3.08   -4.83
 -0.1    -0.11   -0.39   -0.87   -1.04   -1.35   -1.53   -1.74   -2.02   -3.11   -4.86
 -0.2    -0.22   -0.48   -0.94   -1.14   -1.39   -1.55   -1.81   -2.12   -2.99   -4.81
 -0.3    -0.35   -0.51   -1.09   -1.24   -1.52   -1.79   -1.87   -2.24   -2.99   -4.82
 -0.4    -0.44   -0.66   -1.28   -1.46   -1.76   -1.93   -2.02   -2.27   -2.92   -4.87
 -0.5    -0.58   -0.63   -1.35   -1.53   -1.93   -2.03   -2.03   -2.32   -3.08   -4.82
 -0.6    -0.60   -0.57   -1.32   -1.53   -1.99   -2.23   -2.31   -2.47   -3.12   -4.64
 -0.7    -0.61   -0.33   -0.91   -1.12   -1.55   -1.95   -2.17   -2.50   -3.25   -4.57
 -0.8    -0.51    0.36    0.29    0.13   -0.49   -1.02   -1.69   -2.38   -3.37   -4.74
 -0.9    -0.18    1.71    2.12    2.51    1.92    1.19    0.36   -0.89   -2.71   -5.13

# Us (m/sec)      26.37
# Ub (m/sec)      18.67