1307 強安定成層流中における波動モードが乱流生成に及ぼす影響(OS13-2 大気海洋の流体現象と環境流体,オーガナイズドセッション)

概要

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Effects of the wave mode on turbulence generation were experimentally investigated in a strongly stably-stratified flow. Turbulence generation in the collapse process of the waves was clarified through implementing the analyses of the kinetic energy and the potential energy derived from the instantaneous temperature gradients determined by the vertically arranged multi-point sensors. The frequency range of the vertical heat flux against the local temperature gradient was expanded from the low-frequency region toward the higher frequency region through the energy cascade process induced by the non-linear wave-wave interactions. Counter-gradient heat flux was produced with the potential energy exceeding the kinetic energy around the wave-crest. The random components of velocity fluctuations were produced accompanied with the counter-gradient heat flux due to the production of the potential energy of the harmonics through the non-linear effects of the waves.
社団法人日本機械学会の論文
2009-11-06