Interactions Between Large Solid Particles and Homogeneous Shear Turbulence
M. Tokuyama, M. Tanaka, K. Tajiri, H. Nishida & M. Yamakawa
Department of Mechanophysics, Kyoto Institute of Technology, Matsugasaki, Sakyo-Ku, Kyoto 606-8585, Japan
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Fully resolved simulations of homogeneous shear turbulence laden with a large spherical particle are performed in order to investigate the interaction between a large particle and surrounding turbulent shear flow. We focus on the particles, in zero gravity, whose diameter is about 40 times larger than the Kolmogorov length scale of turbulence with solid-to-fluid density ratios of 1 and 5. An immersed boundary method is adopted to represent the spherical particles. Numerical results show that the turbulence kinetic energy is increased around the particle in the case of the high-density ratio, while it is reduced in the case of the unity density ratio. It is also found that the generation of vortex tubes is activated around the particle in the case of the high-density ratio.