F133 森林キャノピー模型まわりの乱れ分布に及ぼす振動する流れの効果

概要

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In the wind tunnel with 99 fans, a uniform flow is produced as the oscillating flow with a steady component and a periodic oscillating component. A trunk and a crown of a tree are modeled as a circular cylinder and many thin aluminum plates with holes. Leaf area index of the tree model is 9. A forest canopy model is composed of the 194 tree models. The forest canopy model is placed in the oscillating flow. At downstream region of the forest canopy model, profiles of mean velocity, intensity of turbulence and Reynolds stress are measured with the CTA. Profiles of mean velocities and Reynolds stress in the oscillating flow are the same as those in the steady uniform flow. However, profiles of intensity of turbulence are different with those in the steady flow at the downstream region above and below the crown.
2000-07-25