The effect of particle anisotropy on the modulation of turbulent flows

Abstract

We investigate the modulation of turbulence caused by the presence of finite-size dispersed particles. Bluff (isotropic) spheres vs slender (anisotropic) fibers are considered to understand the influence of the object shape on altering the carrier flow. While at a fixed mass fraction - but different Stokes number - both objects provide a similar bulk effect characterized by a large-scale energy depletion, a scale-by-scale analysis of the energy transfer reveals that the alteration of the whole spectrum is intrinsically different. For bluff objects, the classical energy cascade is shrinked in its extension but unaltered in the energy content and its typical features, while for slender ones we find an alternative energy flux which is essentially mediated by the fluid-solid coupling.

arXiv comment11 pages, 6 figures

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Cited by in corpus (4)

• Dynamics and fluid-structure interaction in turbulent flows within and above flexible canopies
• Finite-size inertial spherical particles in turbulence
• Particle chirality does not matter in the large-scale features of strong turbulence
• The effect of shear-thinning on the scalings and small-scale structures of turbulence