Abstract
Experimental results are analyzed to develop an understanding of the flow physics causing flat spin of circular cylinders in the critical Reynolds number region. The analysis shows that the flow phenomenon playing the key role in producing flat spin is a three-dimensional moving wall effect, which becomes especially powerful in the critical flow region by controlling flow separation through its effect on boundary-layer transition. Three-dimensional flow phenomena appear to establish the spanwise venting needed to sustain the asymmetric flow separation. It is also found that three-dimensional nonuniform roughness as well as body microasymmetry play important roles in initiating the flat-spin motion.
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