Turbulent flow computation with considering inter-partic collisions of different particle groups

Neng Tsung Chang, Keh Chin Chang

Research output: Contribution to journalArticle

Abstract

Particle-laden turbulent channel flow at Reτ=644, loaded with binary mixture of particles, is numerically studied using the Lagrangian particle tracking method coupled with large eddy simulation. Turbulence statistics of different particle groups are analyzed. Two particle-wall models are applied to this study with (Sommerfeld and coworkers, 1999-2003) and without considering wall roughness. Taking into considerations of rough wall model, the effect of wall roughness in the computations strengthens the wall-normal particle velocity fluctuations. As a result, particles tend to move from the near-wall region to the central core region. It leads to decrement of particle accumulation in the near-wall region as compared to the case considering the smooth wall model. The wall-normal particle mixing capability is enhanced which results in the redistribution of particles in the channel. The behavior of particle motion in the turbulent channel flow should be, thus, dependent on not only the value of Stokes number but also the wall roughness level.

Original languageEnglish
Pages (from-to)1-10
Number of pages10
JournalHangkong Taikong ji Minhang Xuekan/Journal of Aeronautics, Astronautics and Aviation
Volume40 B
Issue number1
Publication statusPublished - 2008 Apr 1

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Space and Planetary Science

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