AM06-04-008 内部重力波の遷移過程におけるエネルギー輸送(流体一般(2),一般講演)

概要

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A wind tunnel experiment was carried out to investigate the energy transfer mechanism in a strongly stably-stratified mixing layer with positive temperature gradient. Temperature and velocity fields were measured by using a rake of 7 cold- and hot-wires and a multi-channel thermo-anemometer system. Isothermal lines and instantaneous local temperature gradient were calculated from the results of spatial measurements of the temperature field. The time-averaged potential energy determined by the temperature fluctuation increased downstream in the mixing layer. Streamwise growth of the wave motion enhanced the increase in energy exchange between potential energy and kinetic energy and the kinetic energy increased downstream against a buoyancy effect. The contours of instantaneous potential energy and the isothermal lines showed that the driving force of the internal gravity waves was the potential energy transported from the local temperature gradient.
日本流体力学会の論文
2006-09-05