内部重力波の遷移過程における熱輸送と乱流生成(成層(1),一般講演)

概要

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Effects of a transition process of internal gravity waves on heat transfer and turbulence generation were experimentally investigated in a strongly stably-stratified mixing layer. Temperature and velocity fields were measured by multi-channel thermo-anemometer systems. Streamwise change in isothermal lines and temperature spectra showed the internal gravity waves developed with strong vertical correlation and collapsed through their nonlinear wave-wave interaction. Real part of wavelet coefficient illustrated the time-dependence of kinetic energy and vertical heat flux at the transition process of the internal gravity waves. Counter-gradient heat flux with high-frequency components was apparently observed when the random components were produced by the break-down of the internal gravity waves. These results mean that the production of random components against the buoyancy effects is induced through the mechanism of the negative turbulence generation formed by the occurrence of the counter-gradient heat flux.
日本流体力学会の論文
2008-09-04