Experimental study on decay and energy transfer mechanism of turbulence generated by fractal structure.

2014 Fiscal Year Final Research Report

• Project/Area Number: 24560190
• 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): SUZUKI Hiroki 名古屋工業大学, 大学院工学研究科, 助教 (10626873)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 乱流

Outline of Final Research Achievements

Compact 8-sensor hot wire probe has been developed, in order to investigate the turbulence energy transfer mechanism. The probe has an ability to measure simultaneously all components of velocity tensor, which appears in the production term of vorticity equation.
According to the measurement in our small wind tunnel, turbulence generated by the fractal structure called Sierpinski tetrahedron has three stages of decay process. First and last stages follow the power law decay, while in-between stage follows the exponential law. It is found that this pattern can be scaled by the n-th power of number of multiplicity of fractal structure.

Free Research Field

流体工学