Self-sustaining and propagating mechanism of localized wave packet in plane-Poiseuille flow
Self-sustaining and propagating mechanism of localized wave packet in plane-Poiseuille flow
In this Letter, it is revealed that the convection velocity of a localized wave packet in two-dimensional plane-Poiseuille flow is determined by the solitary wave at the centerline of a vortex dipole, which is evinced by subtracting the base flow from the mean flow. The fluctuation component propagates obeying the …