平面クエット流の乱流遷移域に生じる乱流ストライプ構造の熱伝達特性

抄録

Direct numerical simulations of a spectral method were performed in order to study turbulent structure and heat transfer in Couette flows at transitional region with/without stable system rotation in spanwise direction. The Prandtl number is 0.71 to assume air. Our objectives in the study were turbulent stripes observed at low Reynolds number without the system rotation and at high Reynolds number with the system rotation. We confirmed that the thermal fields well corresponded to the velocity fields. Appearance of the stripe makes the turbulent Prandtl number lower. As the turbulent region enhances friction and heat transfer, the temporal and spatial oscillations were occurred.