Explanation of differences in experimental and computational results for the preferential concentration of inertial particles

Wittemeier, Thorsten and Shrimpton, John S. (2018) Explanation of differences in experimental and computational results for the preferential concentration of inertial particles. Computers and Fluids, 173, 37-41. (doi:10.1016/j.compfluid.2018.03.078).

Record type: Article

Abstract

Using one-way coupled direct numerical simulations of inertial particles in homogeneous isotropic turbulence we investigate the non-linear dependence of local particle concentrations in particle clusters on the number density of particles used in the simulation per volume. We show that the Reynolds-number dependence of local concentrations in clusters can be predicted for sufficiently high Reynolds numbers by a scaling relation that depends on the average particle number density and the Kolmogorov length. Depending on the average particle number density and gravity, a maximum of preferential concentration does not necessarily occur at Stokes numbers around unity. This explains the differences observed between recent experimental and computational results.

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Explanation of differences in experimental and computational results - Accepted Manuscript

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