Large- and Very Large-scale Structures - Transport and Coherent Structures in Wall Turbulence - page 420

( )

and uu + ,

2

+ +

Figure 6.30. The ratios of the intensities of

∂∂ v y

expressed in terms of their respective values at

Re

τ =

180

The inner sublayer is also subject to the influence of a
second category of structures, which are both long and wide,
according to Jimenez et al. [JIM 04]. Their length scales

are linked to the outer scale. They are
correlated from the wall up to

and

L

∝Λ

L

∝Λ

0 0

. Their role in the
transport of the near-wall Reynolds shear stress is not
predominant.

y =Λ

0

In summary, there are two opposing points of view
regarding the effect of large- and very large-scale structures
on the turbulent structure of the inner sublayer. According
to certain authors, such as Hunt and Morrison [HUN 00], the
large-scale structures in the logarithmic sublayer directly
affect the inner sublayer and directly interact with the wall.
T he increase of the maximum of streamwise intensity
( )

( )

2

, which has been analyzed many times in

uu u ∝ ln Re

τ τ

max

this topic, is therefore a direct mirror effect of the large-scale
structures coming from the outer layer. The viewpoint of a
second group, including [JIM 04], is different: the effect of