Abstract
The effects of particle inertia and drift velocity on the relative dispersion of particles in turbulent flows have been investigated using numerical simulations of isotropic homogeneous turbulence. Isotropic homogeneous turbulence was simulated kinematically using random Fourier modes. The modes were chosen so that the turbulent velocity field was incompressible and so that the wavenumber energy spectrum had the Kolmogorov form. Pairs of particles tended on average to drift apart. Particle drift velocity was found to reduce relative dispersion, unequally in directions parallel and normal to the drift direction. Increasing particle inertia was found to enhance ‘long time’ relative diffusivity. The implications of these results for the turbulent mixing of particles, concentration fluctuations and the evolution of particle clouds dispersing in turbulent flows is discussed.
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