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Applied Mathematics and Mechanics

, Volume 40, Issue 2, pp 293–304 | Cite as

Effects of finite-size neutrally buoyant particles on the turbulent channel flow at a Reynolds number of 395

  • Zhaosheng YuEmail author
  • Chenlin Zhu
  • Yu Wang
  • Xueming Shao
Article
  • 8 Downloads

Abstract

A direct-forcing fictitious domain (DFFD) method is used to perform fully resolved numerical simulations of turbulent channel flows laden with large neutrally buoyant particles. The effects of the particles on the turbulence (including the mean velocity, the root mean square (RMS) of the velocity fluctuation, the probability density function (PDF) of the velocity, and the vortex structures) at a friction Reynolds number of 395 are investigated. The results show that the drag-reduction effect caused by finite-size spherical particles at low particle volumes is negligibly small. The particle effects on the RMS velocities at Reτ = 395 are significantly smaller than those at Reτ = 180, despite qualitatively the same effects, i.e., the presence of particles decreases the maximum streamwise RMS velocity near the wall via weakening the large-scale streamwise vortices, and increases the transverse and spanwise RMS velocities in the vicinity of the wall by inducing smaller-scale vortices. The effects of the particles on the PDFs of the fluid fluctuating velocities normalized with the RMS velocities are small, regardless of the particle size, the particle volume fraction, and the Reynolds number.

Key words

turbulent channel flow finite-size particle direct numerical simulation (DNS) 

Chinese Library Classification

O359 

2010 Mathematics Subject Classification

76F65 

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Copyright information

© Shanghai University and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Zhaosheng Yu
    • 1
    Email author
  • Chenlin Zhu
    • 1
  • Yu Wang
    • 1
  • Xueming Shao
    • 1
  1. 1.State Key Laboratory of Fluid Power and Mechatronic System, Department of MechanicsZhejiang UniversityHangzhouChina

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