高レイノルズ数Taylor-Couette乱流における壁面近傍の微細渦構造(乱流(4),一般講演)

概要

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Direct numerical simulation (DNS) of turbulent Taylor-Couette flow at high Reynolds number has been conducted to investigate dynamics of fine vortical structures near inner and outer walls. Reynolds number based on rotating speed of inner cylinder, u_<in>, and gap width, d=r_<out>-r_<in>, is 12000 and the axial length of the computational domain, h, is set to be 5d. In high-Reynolds-numbers Taylor-Couette flow, many fine scale eddies elongated in the azimuthal direction appear in whole flow fields and fine scale eddies parallel to the axial direction are also formed in sweep regions between large scale Taylor vortices. The generation mechanisms of these fine scale vortices, especially parallel to the axial direction, are discussed.
日本流体力学会の論文
2010-09-09