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Figure 4.38.
a): Instantaneous amplitude and phase (thick line) found by
the Haar wavelet decomposition of the streamwise fluctuating velocity at
k
+
0.24
and
y
+
10
. The measurements were performed in a turbulent
boundary layer at
Re
=
=
913
. The segment C-D shows a typical constant
phase zone; b): Constant phase zones found by DNS at
y
+
θ
=
=
20
,
k
+
0.044
=
and
Re
τ
=
180
. This figure is adapted from [TAR 10c]
Figure 4.39.
Mean duration of constant phase zones as a function of the
wavenumber. The measurements are performed in a turbulent boundary
layer at
Re
913
. We can see that the results obtained on the basis of u at
θ
=
y
+
10
and of the instantaneous wall friction are similar. The duration of
the constant phase zones reaches a maximum at
k
* +
. This figure is adapted
from [TAR 08b]
=
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