Generation of quasi homogeneous isotropic turbulence with no mean flow using Megahertz ultrasonic tranceducers
| Project/Area Number |
15K13867
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Fluid engineering
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| Research Institution | Nagoya University |
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Principal Investigator |
Nagata Koji 名古屋大学, 工学研究科, 教授 (50274501)
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| Co-Investigator(Renkei-kenkyūsha) |
IWANO Koji 名古屋大学, 大学院工学研究科, 助教 (20750285)
ITO Yasumasa 名古屋大学, 大学院工学研究科, 准教授 (40346078)
SAKAI Yasuhiko 名古屋大学, 大学院工学研究科, 教授 (20162274)
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| Project Period (FY) |
2015-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2016: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2015: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
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| Keywords | 流体工学 / 乱流 / 超音波 / 格子乱流 / エネルギーカスケード |
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| Outline of Final Research Achievements |
A grid tank in which turbulence is generated by a grid and steady flow (i.e., acoustic streaming) when Megahertz (0.95 MHz) ultrasound is irradiated into a quiescent water is newly designed and manufactured. The characteristics of created turbulent flows are measured by using particle image velocimetry (PIV). The mesh length of the grid is M=20 mm and the thickness of the square bar is 4 mm, so that its solidity is 36%. In order to further elucidate the characteristics of the turbulent field, a numerical code for direct numerical simulation of temporally developing grid turbulence is newly developed based on the finite difference method. The calculations are conducted on a supercomputer for the mesh Reynolds numbers of 10,000 and 20,000. The characteristics of the turbulent flow are investigated by above-mentioned experiments and calculations.
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Report
(3 results)
Research Products
(1 results)
