2D Hydrodynamics of a Plate: From Creeping Flow to Transient Vortex Regimesстатья
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Дата последнего поиска статьи во внешних источниках: 1 декабря 2021 г.
Аннотация:Based on the numerical and experimental visualization methods, the flow patterns arounda uniformly moving plate located at an arbitrary angle of attack are studied. The study is basedon the fundamental equations of continuity, momentum and stratifying substance transport forthe cases of strong and weak stratified fluids, as well as potential and actually homogeneous ones.The visualization technique and computation codes were compiled bearing in mind conditions ofinternal waves, vortices, upstream, and downstream wakes registration, as well as the resolutionof ligaments in the form of thin interfaces in schlieren flow images. The analysis was carried out ina unified mathematical formulation for a wide range of plate motion parameters, including slowdiffusion-induced flows and fast transient vortex flows. The patterns of formation and subsequentevolution of the basic structural components, such as upstream disturbances, downstream wake,internal waves, vortices, and ligaments, are described both at start of motion and subsequent uniformmovement of the plate. Calculations of forces acting on the obstacle in the flow were carried out tostudy effects of variations in fluid properties, flow conditions and plate parameters on the dynamiccharacteristics of the obstacle. The numerical and experimental results on the flow patterns around aplate are in a good agreement with each other for different flow regimes.