Study on drag and wake of fractal object as crwon-tree model.

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K05792
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Fluid engineering
• Research Institution: Nagoya Institute of Technology
• Principal Investigator: USHIJIMA Tatsuo 名古屋工業大学, 工学(系)研究科(研究院), 准教授 (50314076)
• Co-Investigator(Kenkyū-buntansha): 鈴木 博貴 山口大学, 大学院創成科学研究科, 助教 (10626873)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 流体工学 / 乱流 / フラクタル / 森林学

Outline of Final Research Achievements

Trees play a role as wind break and street shade. Wind drag exerted on tree is mainly due to foliage pattern or crown-tree. In this study, Sierpinski tetrahedron, of which fractal dimensions are almost the same, is taken as a model of crown-tree. Drag on the Sierpinski tetrahedron and its wake profile are revealed. It is found that drag coefficient is constant and that properties of wake turbulence are determined by the size of smallest element (or size of leaf).

Free Research Field

流体工学