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Generation of quasi homogeneous isotropic turbulence with no mean flow using Megahertz ultrasonic tranceducers

Research Project

Project/Area Number 15K13867
Research Category

Grant-in-Aid for Challenging Exploratory Research

Allocation TypeMulti-year Fund
Research Field Fluid engineering
Research InstitutionNagoya University

Principal Investigator

Nagata Koji  名古屋大学, 工学研究科, 教授 (50274501)

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)
Project Period (FY) 2015-04-01 – 2017-03-31
Project Status Completed (Fiscal Year 2016)
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)
Keywords流体工学 / 乱流 / 超音波 / 格子乱流 / エネルギーカスケード
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.

Report

(3 results)
  • 2016 Annual Research Report   Final Research Report ( PDF )
  • 2015 Research-status Report
  • Research Products

    (1 results)

All 2017

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Acknowledgement Compliant: 1 results)

  • [Journal Article] Effects of Grid Geometry on Non-Equilibrium Dissipation in Grid Turbulence2017

    • Author(s)
      K. Nagata, T. Saiki, Y. Sakai, Y. Ito, K. Iwano
    • Journal Title

      Physics of Fluids

      Volume: 29 Issue: 1 Pages: 15102-15102

    • DOI

      10.1063/1.4973416

    • NAID

      120006305602

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant

URL: 

Published: 2015-04-16   Modified: 2018-03-22  

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