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首页> 外文期刊>International Journal of Heat and Fluid Flow >Large eddy simulations of pore-scale turbulent flows in porous media by the lattice Boltzmann method
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Large eddy simulations of pore-scale turbulent flows in porous media by the lattice Boltzmann method

机译：格子玻尔兹曼方法对多孔介质中孔尺度湍流的大涡模拟

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To discuss turbulent transport processes inside porous media, high resolution large eddy simulations by the D3Q27 multiple relaxation time lattice Boltzmann method and their data analysis are performed. The focused porous medium structures are square rod arrays, staggered cube arrays, fractal cube arrays and open cell foam. Although the second moments appearing in the double averaged momentum equation in porous media are the macro-scale Reynolds stress, the micro-scale Reynolds stress and the dispersive covariance, it is found that the micro-scale Reynolds stress and the dispersive covariance become dominant in the present porous medium flows. It is also found that the turbulent anisotropy and the magnitudes of those second moments are totally different among the cases due to the porous structures. Their transport mechanisms are discussed through the budget terms of the transport equations. (C) 2015 Elsevier Inc. All rights reserved.
机译：为了讨论多孔介质内部的湍流传输过程，利用D3Q27多重弛豫时间格子Boltzmann方法进行了高分辨率大涡模拟及其数据分析。聚焦的多孔介质结构是方棒阵列，交错立方体阵列，分形立方体阵列和开孔泡沫。尽管出现在多孔介质双平均动量方程中的第二阶矩是宏观雷诺应力，微观雷诺应力和色散协方差，但发现微观雷诺应力和色散协方差成为主导当前的多孔介质流动。还发现由于多孔结构，湍流各向异性和第二矩的大小在情况之间完全不同。通过运输方程的预算项讨论了它们的运输机制。 （C）2015 Elsevier Inc.保留所有权利。

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