Applied Mathematics and Mechanics >
Investigation of turbulence and skin friction modification in particle-laden channel flow using lattice Boltzmann method
Received date: 2017-06-06
Revised date: 2017-10-09
Online published: 2018-04-01
Supported by
Project supported by the National Natural Science Foundation of China (Nos. 11572183 and 11272198)
Interaction between turbulence and particles is investigated in a channel flow. The fluid motion is calculated using direct numerical simulation (DNS) with a lattice Boltzmann (LB) method, and particles are tracked in a Lagrangian framework through the action of force imposed by the fluid. The particle diameter is smaller than the Kolmogorov length scale, and the point force is used to represent the feedback force of particles on the turbulence. The effects of particles on the turbulence and skin friction coefficient are examined with different particle inertias and mass loadings. Inertial particles suppress intensities of the spanwise and wall-normal components of velocity, and the Reynolds shear stress. It is also found that, relative to the reference particle-free flow, the overall mean skin-friction coefficient is reduced by particles. Changes of near wall turbulent structures such as longer and more regular streamwise low-speed streaks and less ejections and sweeps are the manifestation of drag reduction.
Ming PAN, Qingxiang LI, Shuai TANG, Yuhong DONG . Investigation of turbulence and skin friction modification in particle-laden channel flow using lattice Boltzmann method[J]. Applied Mathematics and Mechanics, 2018 , 39(4) : 477 -488 . DOI: 10.1007/s10483-018-2316-8
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