D-213 内部重力波の崩壊と逆勾配熱拡散の発生

概要

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This study aims to clarify the relation between the occurrence of counter-gradient heat flux and the spatial structure of internal gravity waves in a strongly stably-stratified mixing layer. Multi-point simultaneous measurement of the spatial structure of the waves was conducted by using a multi-channel high precision thermo-anemometer. Fundamental frequency components of the internal gravity waves of 1.2,1.8,3.0Hz were spontaneously generated in the mixing layer. Energy density level of temperature fluctuation increased remarkably below the Brunt-Vaisala frequency, as the internal gravity waves developed. At the same time, the spatial correlation among the temperature fluctuations became stronger, which shows the growth of vertical structure of the waves. The counter-gradient heat flux occurred through the break down of the wave front of the internal gravity waves by the nonlinear interaction between the fundamental frequencies and their higher harmonics.
日本流体力学会の論文
2003-07-28