Abstract
Vortex shedding in the transitional wake of a circular cylinder in a shear flow has been investigated. The focus has been on the effect of a bidirectional shear, i.e., the oncoming unidirectional flow varied linearly both in the spanwise and cross-stream directions. The computer experiments showed that the bidirectional shear resulted in a wake with oblique and cellular vortex shedding similar to the cylinder wake resulting from spanwise shear alone. The presence of a planar shear, however, gave rise to longer cellular cells. Due to the bidirectional shear inflow, the pressure was higher along the high-velocity side of the cylinder surface than along the low-velocity surface and at the same time exhibited a spanwise variation, which gave rise to secondary motions along the stagnation line and in the base region. Even though the cross-stream shear component was four times larger than the spanwise shear, the latter tended to dominate the three-dimensional wake dynamics.
Published Version
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