Evolution of turbulence in an oscillatory flow in a smooth-walled channel: a viscous secondary instability mechanism.
In this paper, a comparison is made of the evolution of turbulence in oscillatory channel flows with a zero-mean velocity in two and three dimensions, using the numerical technique of the lattice Boltzmann method. The results confirm a primary two-dimensional instability. Evidence is shown of a secondary, viscous three-dimensional instability mechanism acting in the oscillatory boundary layer, which is consistent with experimental observations.
Cosgrove
J A
JA
School of Physics, The University of Edinburgh, Edinburgh EH9 3JZ, Scotland, United Kingdom.
Buick
J M
JM
Tonge
S J
SJ