Abstract
This work presents an experimental study of the bistability phenomenon downstream of pairs of finite cylinders with aspect ratios h/d of 3 and 4. In finite cylinders, bistability is still poorly explored and understood. The wake flow around a single finite cylinder with Red = 2.00 × 104 was studied. After that, the flow around two finite cylinders with diameters of 25 and 32 mm and aspect ratios of 3 and 4 was studied (3.86 × 103 ≤ Red ≤ 4.81 × 104). Hot wire anemometry in an aerodynamic channel and flow visualization by ink injection in water in a hydraulic channel were employed. Analysis of hot wire data employed statistics, spectral, and wavelet tools. Video analysis was made with editing software and statistical tools. The flow visualization technique strengthens the interpretation of the results obtained through the hot wire anemometer technique. In this work three concomitant flows are considered: the upward flow, from the cylinder base; the downward flow, from the top; and the so-called main flow, by the vortex shedding at half height of the cylinders. The results show the existence of two different levels of mean velocity in time series, corresponding to two flow modes confirming the presence of the phenomenon of bistability for two finite cylinders placed side by side. Downward flow from the top of the cylinders with an aspect ratio of h/d = 4 studied also presents bistable characteristics.
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