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Subgrid Particle-Fluid Coupling Evaluation in Large-Eddy Simulations of Particle-Laden Flows

[+] Author Affiliations
Luís M. Portela, René V. A. Oliemans

Delft University of Technology, Delft, The Netherlands

Paper No. IMECE2002-33113, pp. 621-628; 8 pages
doi:10.1115/IMECE2002-33113
From:
  • ASME 2002 International Mechanical Engineering Congress and Exposition
  • Fluids Engineering
  • New Orleans, Louisiana, USA, November 17–22, 2002
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 0-7918-3657-6 | eISBN: 0-7918-1691-5, 0-7918-1692-3, 0-7918-1693-1
  • Copyright © 2002 by ASME

abstract

Point-particle Eulerian-Lagrangian DNS/LES simulations allow us to deal with a large number of small particles, using relatively modest computer resources. When doing LES, one can consider the subgrid particle-fluid coupling, using a subgrid model, or simply ignore it. We present a criterion to evaluate the importance of the subgrid particle-fluid coupling on: (i) the particle motion, and (ii) the resolved fluid-motion. The criterion assumes that the particles can be treated as point-particles, from the perspective of both the resolved and subgrid motions, and it is based on simple “local equilibrium” models for the interaction between the particles and the subgrid fluid-motion. The criterion was applied to a high-resolution channel flow LES, with a moderate particle-loading. The results indicate that: (i) for heavy particles, the common practice of ignoring the subgrid particle-fluid coupling is adequate, (ii) for very-light particles a model for the subgrid-driven particle-velocity fluctuations might be important.

Copyright © 2002 by ASME

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