DOI: 10.1615/TSFP5
TEMPORAL DYNAMICS OF VORTICAL STRUCTURES IN TURBULENT CHANNEL FLOW
要約
The temporal dynamics of vortical structures in the wall
region of turbulent channel flow is investigated. The
Navier-Stokes equations are integrated numerically at
friction Reynolds number Reτ = 180, using a computational code that utilizes a mixed spectral-finite difference technique and following the DNS approach.
A turbulent-flow database representing the turbulent
statistically steady state of the velocity field through 10 viscous time units is computed and the method of the
"imaginary part of the complex eigenvalue pair of the
velocity-gradient tensor" is applied for vortex eduction.
Flow visualizations are provided that support a visual
description of the evolutionary process with time of single and multiple hairpin vortical structures in the wall layer.