D225 内部重力波の位相速度計測(D-22 流体一般(6),一般講演)

概要

論文の詳細を見る
Simultaneous measurement was conducted on temperature and velocity fluctuations of internal gravity waves in a strongly stably-stratified mixing layer with stepwise temperature distribution. The phase velocities of the resonant frequency components of the internal gravity waves were determined based on the phase difference analysis on the temperature fluctuation. They were smaller than the mean velocity in the upstream region but approached it as the waves developed downstream. Wavelength was estimated from the phase velocity. The streamwise scale of the waves was far larger than the vertical one. These results suggest that the waves propagate almost horizontally in the mixing layer. The phase velocity of the higher harmonic component increased rapidly just before the collapse of the waves, suggesting the occurrence of wave-front deformation through nonlinear wave-wave interaction.
日本流体力学会の論文
2004-08-09