三次元円柱からの斜め渦放出 : 流体工学,流体機械

概要

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When a circular cylinder is traveled in a towing tank, it has been observed that the wake vortices near the ends begin to be shed at oblique angles at the low Reynolds number. As the cylinder travels further, the oblique shedding region extends inwards and it covers the parallel shedding region gradually. The oblique vortex shedding mode in the circular cylinder wake is examined numerically with the three-dimensional Navier-Stokes simulations. Transition from a parallel shedding mode to an oblique shedding mode is observed for both a free-ended circular cylinder and a circular cylinder with end plates. The present study shows that the different end conditions such as the angle of the end plates result in a distinct oblique angle even if the Reynolds number is the same. The effects of the end conditions upon the mode tansitions and the final oblique angles will be discussed.
2001-08-25