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Particle transport behavior in air channel flow with multi-group Lagrangian tracking

Chinese Physics B 2017年第1期26卷 267-277页

作者：卢浩赵文君张会强王兵王希麟 School of Aerospace Engineering Tsinghua University Beijing 100084 China Faculty of Architecture The University of Hong Kong Hong Kong China

The particle motions of dispersion and transport in air channel flow are investigated using a large eddy simulation（LES） and Lagrangian trajectory method. The mean and fluctuating velocities of the fluids and particles are obtained,and the results are in good agreement with the data in the literature. Particle clustering is observed in the near-wall and low-speed regions. To reveal the evolution process and mechanism of particle dispersion and transport in the turbulent boundary layer, a multi-group Lagrangian tracking is applied when the two-phase flow has become fully developed： the fluid fields are classified into four sub-regions based on the flow characteristics, and particles in the turbulent region are divided accordingly into four groups when the gas–particle flow is fully developed. The spatiotemporal transport of the four groups of particles is then tracked and analyzed. The detailed relationship between particle dispersion and turbulent motion is investigated and discussed.

关键词： particle-laden flows channel flow large-eddy simulations coherent structures

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Three-dimensional turbulent flow over cube-obstacles

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Chinese Physics B 2017年第1期26卷 278-284页

作者：卢浩赵文君张会强王兵王希麟 School of Aerospace Engineering Tsinghua University Faculty of Architecture The University of Hong Kong

In order to investigate the influence of surface roughness on turbulent flow and examine the wall-similarity hypothesis of Townsend, three-dimensional numerical study of turbulent channel flow over smooth and cube-rough walls with different roughness height has been carried out by using large eddy simulation（LES） coupled with immersed boundary method（IBM）. The effects of surface roughness array on mean and fluctuating velocity profiles, Reynolds shear stress, and typical coherent structures such as quasi-streamwise vortices（QSV） in turbulent channel flow are obtained. The significant influences on turbulent fluctuations and structures are observed in roughness sub-layer（five times of roughness height）.However, no dramatic modification of the log-law of the mean flow velocity and turbulence fluctuations can be found by surface cube roughness in the outer layer. Therefore, the results support the wall-similarity hypothesis. Moreover, the von Karman constant decreases with the increase of roughness height in the present simulation results. Besides, the larger size of QSV and more intense ejections are induced by the roughness elements, which is crucial for heat and mass transfer enhancement.

关键词： turbulent flow channel flow large-eddy simulations coherent structures

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