Interactions of a stationary finite-sized particle with wall turbulence

Lanying Zeng, S. Balachandar, Paul Fischer, Fady Najjar

Research output: Contribution to journalArticlepeer-review

Abstract

Reliable information on forces on a finite-sized particle in a turbulent boundary layer is lacking, so workers continue to use standard drag and lift correlations developed for a laminar flow to predict drag and lift forces. Here we consider direct numerical simulations of a turbulent channel flow over an isolated particle of finite size. The size of the particle and its location within the turbulent channel are systematically varied. All relevant length and time scales of turbulence, attached boundary layers on the particle, and particle wake are faithfully resolved, and thus we consider fully resolved direct numerical simulations. The results from the direct numerical simulation are compared with corresponding predictions based on the standard drag relation with and without the inclusion of added-mass and shear-induced lift forces. The influence of turbulent structures, such as streaks, quasi-streamwise vortices and hairpin packets, on particle force is explored. The effect of vortex shedding is also observed to be important for larger particles, whose Re exceeds a threshold.

Original languageEnglish (US)
Pages (from-to)271-305
Number of pages35
JournalJournal of Fluid Mechanics
Volume594
DOIs
StatePublished - Jan 10 2008
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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