軸流のある渦構造の崩壊過程(乱流渦構造(3),一般講演)

概要

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The interaction between a columnar vortex and external turbulence is investigated numerically. The q-vortex is immersed in an initially isotropic homogeneous turbulence field, which itself is produced numerically by a direct numerical simulation of decaying turbulence. The formation of turbulent eddies around the columnar vortex and the vortex-core deformations are studied in detail by visualizing the flow field. In the less-stable case with q=-1.5, small thin spiral structure is formed inside the vortex core. In the unstable case with q=-0.45, the linear unstable modes grows until the columnar vortex make one turn. Its growth rate agrees with that of the linear analysis of Mayer and Powell. After the vortex made several turns, the secondary instability is excited. It caused that the columnar q-vortex collapses and many fine scale vortices appear abruptly.
日本流体力学会の論文
2007-08-06