Title: Flow dynamics and forces associated with a cylinder rolling along a wall
Abstract: The wake flow structures and the drag force for a cylinder rolling along a wall without slipping were calculated for the Reynolds number range 20<Re<200, covering the two-dimensional shedding regime. Time-dependent numerical computations show the wake undergoes a steady to periodic shedding transition between 85<Re<90. The Strouhal number varies only weakly at higher Reynolds number, and is a factor of 3–4 lower than for an isolated rotating or nonrotating body. Also, within this shedding regime, the wake is characterized by counter-rotating vortex pairs, which propagate away from the wall via mutual induction. These pairs are formed as compact vortex structures from the top separating shear layer induce secondary vorticity at the wall, which is pulled up from the boundary to form the semidiscrete flow structures. Over both the steady and unsteady regimes, the (time-mean) recirculation length and drag are quantified.
Publication Year: 2006
Publication Date: 2006-11-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 26
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