せん断流中における丘陵背後の非対称流れと熱伝達に関する数値シミュレーション(熱工学,内燃機関,動力など)

概要

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The present study performed three-dimensional numerical simulations of asymmetrical flows and heat transfer around a hill in shear flows. When shear velocity distributions are given at the inlet, a vortex pair is formed asymmetrically to the spanwise direction behind the hill. Further, an asymmetrical hairpin vortex is periodically generated downstream. The leg of the asymmetrical hairpin vortex precedently collapses at the high speed side. Further downstream, the asymmetrical hairpin vortex breaks down more early than the symmetrical hairpin vortex, and the streamwise vortices appear at the high speed side. These streamwise vortices increase the heat transfer downstream. In contrast, the hairpin vortex does not appear for the case of the strong shear velocity distribution, but a streamwise vortex appears. The heat transfer decreases downstream since the turbulence generated by the streamwise vortices is weak.
一般社団法人日本機械学会の論文
2008-03-25