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ISSN オンライン: 2642-0554

STUDY OF VORTICAL SEPARATION FROM AN AXISYMMETRIC HILL

Roger L . Simpson
Department of Aerospace and Ocean Engineering Virginia Polytechnic Institute and State University Blacksburg, VA 24061-0203 USA

Cheri H. Long
Department of Aerospace Engineering Virginia Tech, Blacksburg, VA 24061-0203

要約

Surface mean pressures, oil flow visualizations, and 3-velocity-component laser-Doppler velocimeter measurements are presented for a turbulent boundary layer of thickness δ over an axisymmetric hill of height H = 2δ. Complex vortical separations occur on the leeside and merge into 2 large streamwise mean vortices downstream. At x/H = 3.69, the near-wall flow (y+ < 90) is dominated by the wall, while the vortices in the outer region produce large turbulence levels near the centerline and appear to have low frequency motions that contribute to turbulent diffusion.