強安定成層流中における内部重力波の崩壊と乱流生成(対流・拡散・渦・波動成層,一般講演)

概要

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Effects of internal gravity waves on turbulence generation were experimentally investigated in a strongly stably-stratified flow. The spatial structure of the waves in the collapse process was illustrated in the contour maps of potential energy derived from the instantaneous temperature gradients determined by the multi-point simultaneous measurement. In the streamwise development of the internal gravity waves which involved the accumulation of the potential energy, the temperature fluctuations obtained by the vertically arranged sensors became to be synchronized. Potential energy transported from the mean temperature fields was concentrated around the distorted wave-crests due to the non-linear effects of well-developed internal gravity waves. High frequency random components were produced through the energy cascade process induced at the collapse of the waves. Non-linear effects generated the counter-gradient heat flux with converting the potential energy of the harmonics irreversibly to the turbulent kinetic energy, then the turbulence components were produced against the buoyancy effects.
日本流体力学会の論文
2009-09-02