The Flow Generated in a Stratified Fluid by the Motion of a Flat Horizontal Disk
The response of a stratified fluid to the imposition of a surface stress has long been a topic of interest in geophysical fluid dynamics because of the relevance of the problem to mixing and overturning in large lakes, reservoirs and ocean basins. In the first definitive laboratory investigations (e.g Kato and Phillips, 1969; Kantha et al., 1977; Scranton and Lindberg, 1983) in this area, a linearly-stratified fluid contained in an annular tank was subjected to a constant surface stress imposed by the motion of a rotating screen and the process of entrainment was thereby initiated. As a result, a so-called mixed layer was generated, the thickness of which grew with time at a rate dependent upon the appropriate Richardson number of the established flow. In the annular geometry, the presence of secondary flows ensured that the development of the mixed layer was three-dimensional. Further experiments have been carried out by many authors since the above investigations and the reader is referred specifically to the recent article by Fernando (1991) for a comprehensive record and review of the resulting data
KeywordsMixed Layer Vortex Motion Vorticity Field Stratify Fluid Large Disk
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