turbulent coaxial jet

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.