E-115 ラフネスブロック上に発達する安定・不安定温度成層乱流境界層に関する実験的研究

概要

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Turbulent structures of stable/unstable stratified boundary layers developing on roughness blocks are investigated experimentally. Thermal stratified wind tunnel with facilities to control the floor and inflow temperatures are used. Stratified boundary layers developing on smooth wall are also investigated to make clear the roughness effects. For the weak stable stratified boundary layer, the effect of the stratification is enhanced by the roughness blocks. For the weak unstable stratified boundary layer, the plume shows similar structures like the strong unstable boundary layer and brings large entrainment due the existence of roughness blocks. Large entrainment is proved from the power spectrum of velocity fluctuation. The developing process of the unstable stratified boundary layer is also investigated with consideration of the variation of wall conditions. The developing process is enhanced by the roughness blocks.
日本流体力学会の論文
2003-07-28