十字交差二円柱からの縦渦流出に及ぼす上流円柱の振動の影響(流体工学, 流体機械)

概要

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The two types of longitudinal vortices, the trailing vortex and the necklace vortex, shed periodically near the intersection part of the criss-cross circular cylinders located in uniform flow. The influence of the oscillation of upstream cylinder on longitudinal vortex excitation caused by their vortices was investigated. In the case where the trailing vortex is shedding, the lock-in phenomenon occurs on the wide condition for the free stream velocity and the frequency and the amplitude of the upstream cylinder oscillation, compared with the lock-in condition of Karman vortex. On the other hand, the lock-in region of the necklace vortex is narrower than that of Karman vortex. In either case, the phase difference between the oscillation of the upstream cylinder and the vortex shedding decreases with increasing non-dimensional oscillation frequency.
2002-05-25