Coherent Wall Structures: Dynamics and Contribution to Turbulent Activity - Transport and Coherent Structures in Wall Turbulence - page 215

for by the ejections and sweeps at y + >

30 is 0.35. Quadrant-
IV events are more numerous in the lower buffer and viscous
sublayers.

Figure 4.14. Distributions of the residence time of ejections
a) and sweeps b) in the inner sublayer at Re

τ =

500

4.5. Streaks

The high- and low-velocity streaks (Figure 4.15) are t he
kinematic consequence of the QSVs. Their mean spacing

λ

in the spanwise direction is a universal characteristic of wall
turbulence.