内部重力波の遷移過程の制御とエネルギー輸送機構の解明(流体工学,流体機械)

概要

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Energy transfer mechanism of internal gravity waves in their transition process was experimentally investigated. Thermal regulation was conducted by giving small sinusoidal thermal disturbance satisfying the three-wave resonance condition at the initial stage of their streamwise development. For the excited case, the frequencies of their irregular eigen-modes became fixed and the phase difference between vertical velocity and temperature fluctuation components was locked up around-π. Increase in correlation between the velocity and the temperature fluctuations strengthened down-gradient heat flux and the energy of mean temperature gradient was efficiently transferred to encourage the wave motion. The internal gravity waves became to have larger potential energy as they developed downstream. The excited internal gravity waves produced stronger random velocity fluctuations through the cascade process and induced larger counter-gradient heat flux at their collapse.
社団法人日本機械学会の論文
2005-04-25