Shear layer vortices and longitudinal vortices in the near wake of a circular cylinder
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2012, Journal of Fluids and StructuresCitation Excerpt :Evolution of three dimensionality in the wake behind nominally two dimensional bluff bodies is a natural phenomenon and inherent characteristic of periodic flows dominated by the Karman vortices (also known as rollers having spanwise vorticity). Numerous early investigations of flow over circular cylinder, both experimental (Huang et al., 2006; Lin et al., 1995; Scarano and Poelma, 2009; Scarano et al., 2006; Williamson, 1992, 1996; Wu et al., 1994, 1995, 1996a,b) and numerical (Leweke and Williamson, 1998; Mittal and Balachandar, 1995, 1997; Thompson et al., 1996; Zhang et al., 1995) have confirmed emergence of longitudinal braids or ribs (streamwise vortices) due to spanwise instability of rollers in their formation phase even at the Reynolds numbers as low as a couple of hundred. The occurrence of these streamwise vortices along the span of the rollers is temporally and spatially random with their spanwise length scale (spacing) being strongly dependent on the Reynolds number.