Dynamic behavior of flow velocity fluctuations in a H<sub>2</sub>/O<sub>2</sub> turbulent coaxial jet

ORAL

Abstract

We have numerically studied the dynamic behavior of flow velocity fluctuations in H2/O2 turbulent coaxial jet from a viewpoint of complex networks. The turbulence network proposed by Taira et al., [J. Fluid Mech. 795, R2 (2016).] in which weighted networks are constructed by connecting each fluid element to other fluid elements, is useful for identifying vortical interactions in a turbulent flow. The importance of the turbulence network has been shown in different physical settings by one of authors [S. Murayama et al., Phys. Rev. E. 97, 022223 (2018); K. Takagi et al., Chaos 28, 045116 (2018)]. Here we adopt the turbulent network for the vorticity field in H2/O2 turbulent coaxial jet. A clear power-low decay appears in the probability density function of vertex strength. In this presentation, we discuss a possible existence of scale-free structure in the network.

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Presenters

  • Wataru Kobayashi

    • Department of Mechanical Engineering, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo 125-8585, Japan

Authors

  • Wataru Kobayashi

    • Department of Mechanical Engineering, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo 125-8585, Japan

  • Hiroshi Gotoda

    • Department of Mechanical Engineering, Tokyo University of Science, 6-3-1, Niijuku, Katsushika-ku, Tokyo 125-8585, Japan
    • Department of Mechanical Engineering, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo 125-8585, Japan

  • Yuya Ohmichi

    • JAXA
    • Japan Aerospace Exploration Agency, 7-44-1, Jindaiji-higashimachi, Chofu, Tokyo 182-8522, Japan
    • Japan Aerospace Exploration Agency

  • Shingo Matsuyama

    • Japan Aerospace Exploration Agency, 7-44-1, Jindaiji-higashimachi, Chofu, Tokyo 182-8522, Japan