多重円形プローブによる球後流の三次元渦構造の解明(乱流渦構造(3),一般講演)

概要

論文の詳細を見る
Three-dimensional vortical structure was investigated behind a sphere through circular multiple probe measurement. In the range of Re_d≒800〜7000, the low mode St number was kept constant around St_L≈0.2 while the high mode St number increased discontinuously with Re_d. The fact means that an integral number of the small-scale high mode vortices make one large-scale low mode structure. The high mode vortex has a hairpin-shaped sculpture and the low mode structure possesses either a helical or a staggered arrangement. The high mode vortices included in the low mode structure of helical arrangement circulate on the multiple probe surface once every period of the low mode rotation, whereas the rotational direction changes at random. In the low mode structure of the staggered arrangement, a pair of the hairpin vortices alternately appears on the opposite side of the multiple probe every half period of the low mode.
日本流体力学会の論文
2007-08-06