To deal with a number of solid bodies moving in fluid flow, we proposed an immersed-boundary method, in which the fortified Navier-Stokes equation was applied (Kajishima, et al., 2001). The fluid forces on the bodies are obtained by resolving flow around them. In this paper, some improvement for wider variety of flow conditions is introduced. Then a result of direct numerical simulation (DNS) of turbulence caused by over 1024 particles falling by gravity is demonstrated with particular interest on the influence of particle rotation.

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