Civil Engineering Reference
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have a very different topology. The clusters wherein the
maximum distance between the structures is greater than
y
+
and which penetrate into the logarithmic sublayer
are called “large-scale attached structures” (LSAS).
4
The
streamwise and spanwise characteristic lengths of LSAS
vary with the distance
>
100
max
y
between the structures in a self-
similar manner, with
L
∝
6
y
L
∝
3
y
xGSA
(
)
c
zGSA
(
)
c
Figure 6.11, a
d
apted from [ALA 06b], shows the mean
spanwise length
L
+
of the packets of LSAS. We can see a
linear increase with the location of the center of the vortices
z GSA
(
)
y
+
. The length scales of these objects are close to the integral
scale
c
3*
K
.
u
ε
Figure 6.11.
Mean spanwise length of packets of attached structures. The
figure combines experimental and numerical data from various different
sources. This figure is adapted from [ALA 06b]
4 There is no direct link between these structures and the very large-scale
motions presented in section 6.6.
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