抄録
This study has been conducted to investigate the development of large-scale turbulent structures behind a backward-facing step. Two-dimensional velocity field was measured by a flying hot-wire technique with X-type multiple probe rake, and distributions of the mean and fluctuating velocity, Reynolds shear stress and forward flow fraction were obtained over x/H = 0.15 to 10. Proper orthogonal decomposition was employed to analyze the large scale structures in the separated shear layer. POD coefficients of the u- and v-component at the first mode were found to have a negative correlation with each other, and flow structures reconstructed with this POD mode contribute largely to the generation of the Reynolds shear stress.
