The interaction between a solid particle and a turbulent flow

Aurore Naso, Andrea Prosperetti

Research output: Contribution to journalArticleAcademicpeer-review

60 Citations (Scopus)
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Abstract

The interaction between a fixed solid spherical particle and stationary turbulence with zero mean flow is investigated numerically. The object diameter, D, lies in the inertial range (D≈0.6L≈0.9λ≈8η, where L, λ and η, respectively, denote the integral scale, the Taylor microscale and the Kolmogorov length) and the particle Reynolds number is close to 20. It is found that the turbulence statistics at different distances from the solid/fluid interface are modified by the presence of the object in a region that extends more than 10 times further than the viscous layer. This estimate is confirmed by the analysis of the correlation between the force and torque on the particle and the force and torque on spherical surfaces surrounding the particle, although the torque decorrelates somewhat faster with increasing distance from the object surface. The angular slip velocity of the particle, a quantity of crucial importance for the modeling of the turbulent transport of large objects, is also characterized.
Original languageEnglish
Article number033040
Number of pages21
JournalNew journal of physics
Volume12
Issue number3
DOIs
Publication statusPublished - 2010

Keywords

  • METIS-267634
  • IR-79276

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