乱流境界層中の大規模馬蹄形渦

概要

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Vorticity fields were experimentally given with respect to a large-scale coherent vortex in a fully developed turbulent boundary layer. Three vorticity components, vorticity vectors, and enstrophy were obtained from the ensemble-averaged velocity components measured through conditional samplings. The vorticity vector maps showed that the large-scale vortex had a horseshoe like structure inclining downstream at an angle of about 50 deg. with respect to the wall. The normal and spanwise scales of the coherent vortex were about 1.0δ. At the legs of the large-scale vortex composed of a pair of vortex tubes, the contribution of the longitudinal and normal vorticity components exceeded that of the spanwise component. The enstrophy had the maximum value of Y/δ≒0.1 at the bottom of its legs.
社団法人日本機械学会の論文
1991-01-25