Achievement of unprecedented turbulent state in plane Couette system

- Enhancement of heat and momentum transfer -

Abstract

Direct numerical simulation has been performed for turbulent plane Couette flow to achieve the unprecedented state with stronger turbulence than a usual turbulent state found by Watanabe et al. (2015) by introducing spatiotemporally localized body force mimicking blowing and suction control in experiments. It is confirmed that the introduced body force leads to the unprecedented state sustaining even after forcing, significantly enhancing heat and momentum transfer. The present numerical simulation suggests the experimental achievement of the unprecedented turbulence for novel strategy of heat transfer enhancement.