Forward and backward multi-particle dispersion in homogeneous isotropic turbulence

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  • 一様等方性乱流における前進および後退多粒子拡散

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<p>Turbulent diffusion in homogeneous isotropic turbulence is numerically investigated using the direct numerical simulation (DNS). The four-dimensional turbulence database allows us to track fluid particles not only in the forward direction of time but also in the backward direction. Two-particle dispersion has been studied in previous studies and it is known that backward diffusion is faster than forward diffusion. However, little is known about multi-particle dispersion due to the difficulty of observing it experimentally. Studies on backward diffusion are also limited. In this study, multi-particle dispersion is numerically investigated and its properties are discussed, e.g., direction of time and geometry of a tetrahedron. The results show that forward and backward diffusions of multi-particles behave differently at the beginning and evolve similarly after the transient time, but the coefficients of the backward direction are larger than those of the forward direction.</p>

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