Abstract
The flow past a surface-piercing circular cylinder near a moving wall at Re=100 and Fr=0.6 has been investigated using direct numerical simulation. The gap distance between the cylinder and the wall is G/D=∞, 1.5, and 0.6, where G/D=∞represents the isolated cylinder without the wall. The periodic shedding of organized vortices from the cylinder is observed in the deep flow which is far from the free surface. However, the vortex shedding is attenuated beneath the free surface, showing the flow past the cylinder is almost steady. Suppression of vortical development causes the decreases in the temporal fluctuations of the drag and lift coefficients beneath the free surface. The decreases in the coefficient fluctuations for G/D=0.6 are more dominant than those for G/D=1.5. The transition of hydrodynamic forces beneath free surface depends on the gap distance between the cylinder and the moving wall.
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