The effect of particle anisotropy on the modulation of turbulent flows Articles uri icon

authors

  • OLIVIERI, STEFANO
  • CANNON, IANTO
  • ROSTI, MARCO E.

publication date

  • November 2022

start page

  • R2-1

end page

  • R2-12

volume

  • 950

International Standard Serial Number (ISSN)

  • 0022-1120

Electronic International Standard Serial Number (EISSN)

  • 1469-7645

abstract

  • We investigate the modulation of turbulence caused by the presence of finite-size dispersed particles. Bluff (isotropic) spheres versus slender (anisotropic) fibres are considered to understand the influence of the shape of the objects 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 shrinks in its extension but is 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.

subjects

  • Aeronautics
  • Biology and Biomedicine

keywords

  • complex fluids; multiphase and particle-laden flows; turbulent flows