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Generation and Characterization of Homogeneous Isotropic Turbulence

균질한 등방향성 난류 생성 및 특성 변화 분석

  • Lee, HoonSang (Department of Mechanical & Aerospace Engineering, Seoul National University) ;
  • Han, KyuHo (Department of Mechanical & Aerospace Engineering, Seoul National University) ;
  • Park, Han June (Department of Mechanical & Aerospace Engineering, Seoul National University) ;
  • Jung, HyunKyun (Department of Mechanical & Aerospace Engineering, Seoul National University) ;
  • Hwang, Wontae (Department of Mechanical & Aerospace Engineering, Seoul National University Institute of Advanced Machines and Design, Seoul National University)
  • Received : 2018.03.26
  • Accepted : 2018.04.09
  • Published : 2018.04.30

Abstract

Homogeneous and isotropic turbulence (HIT) with no mean flow is a very useful type of flow for basic turbulence research. However, it is difficult to generate HIT in the lab. In this study, we implemented HIT in a confined box through synthetic jet actuators using sub-woofer speakers. Characteristics of HIT are varied depending on the strength of the jets. We used 2D PIV to measure the velocity field. Turbulence statistics such as homogeneity, isotropy ratio, turbulence kinetic energy, dissipation rate, Taylor microscale, Kolmogorov scale, and velocity correlation coefficient were calculated. Most of the turbulence statistics increased exponentially according to the strength of the jets, and the Taylor Reynolds number reached up to 185.

Acknowledgement

Supported by : 한국연구재단

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