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国际流体力学研究期刊
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.5

ISSN 打印: 2152-5102
ISSN 在线: 2152-5110

国际流体力学研究期刊

DOI: 10.1615/InterJFluidMechRes.v42.i4.10
pages 281-300

Development of Streamwise Vortices in Unsteady Circular Couette Flow

L. V. Tkachenko
Institute of Hydromechanics of National Academy of Sciences of Ukraine 8/4, Zhelyabov St., 03680, Kyiv-180, MSP, Ukraine
N. S. Gorodetska
Institute of Hydromechanics of National Academy of Sciences of Ukraine, 8/4, Zhelyabov St., Kyiv, 03057, Ukraine
V. I. Nikishov
Institute of Hydromechanics of National Academy of Sciences of Ukraine, 8/4, Zhelyabov St., Kyiv, 03057, Ukraine

ABSTRACT

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.