ON THE INSTABILITY OF A FULL NON-PARALLEL FLOW - KOVASZNAY FLOW

摘要: The local instability of a full non-parallel flow is investigated. basic horizontal uniform about vertical array periodic bound eddies. This was found by Kovasznay as an exact solution to the Navier–Stokes equations. problem formulated initial value with two sets complete orthogonal functions. A new approach semi-infinite domain given computationally modified rational Chebyshev function. linear stability analysis performed respect odd–rational mode and even–rational for evolution disturbances. While symmetrical vortex sheets appeared through process big eddies breaking into small in mode, von Karman street phenomena mode. corresponding antisymmetric velocity perturbation be far more unstable than symmetric disturbance. An organized structure developed after onset instability. Several general characteristics are discussed.