Effect of rotation on turbulence structure and diffusion in oscillating grid turbulence

2016 Fiscal Year Final Research Report

• Project/Area Number: 26289034
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Fluid engineering
• Research Institution: Nagoya Institute of Technology
• Principal Investigator: Morinishi Yohei 名古屋工業大学, 工学(系)研究科(研究院), 教授 (40222351)
• Co-Investigator(Kenkyū-buntansha): 玉野 真司 名古屋工業大学, 工学(系)研究科(研究院), 准教授 (40345947)
• Research Collaborator: Takahashi Shunsuke ; Kimura Mitsuhiro ; Tashiro Hideyuki ; Mizuochi Masaki
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 乱流

Outline of Final Research Achievements

Oscillating grid turbulence subjected to system rotation was investigated experimentally and numerically. The experiment was carried out in a rectangular tank on a rotating table. For the experimental apparatus, some devices were introduced to inhibit the secondary circulation which is inherent in the system. In the numerical simulation, the Navier-Stokes equations were solved with the secondary conservative finite difference scheme on an ALE type moving grid.
The quasi-two-dimensional vortex structure was visualized for the region distant from the oscillating grid for the rotating flow, while three-dimensional vortex structure was dominant close to the oscillating grid for both stationary and rotating systems. The turbulence decay and its inhabitation by rotation were also indicated in addition to standard turbulence statistics. In the developing stage of the quasi-two-dimensional vortex structure in the rotating system, the inertial wave propagation was specified.

Free Research Field

流体工学