年間 6 号発行
ISSN 印刷: 2152-5102
ISSN オンライン: 2152-5110
Indexed in
Development of Streamwise Vortices in Unsteady Circular Couette Flow
要約
The results of numerical simulation of the development of streamwise Gortler vortices formed in unsteady circular Couette flow are represented. The vortices are initialized by injection of artificial vortical disturbances at given place of flow and at given instant of time. The problem of receptivity of the boundary layer in respect to the external disturbances is considered. The influence of the initial energy of disturbances, their wavelength, the location of input point and time of injection on the vortex characteristics are analyzed. A "cascade" mechanism of transport of disturbances from stability zone to the boundary layer has been identified. The features of formation and development of mushroom-shaped structures, in particular their uneven growth in transversal direction and subsequent increase of wavelength (Eckhaus instability) are explored.