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首页> 外文期刊>International Journal of Heat and Fluid Flow >Modelling turbulent and dispersion heat fluxes in turbulent porous medium flows using the resolved LES data
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Modelling turbulent and dispersion heat fluxes in turbulent porous medium flows using the resolved LES data

机译:使用已解析的LES数据模拟湍流和多孔介质中的湍流和分散热通量

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摘要

Resolved large eddy simulations (LESs) of turbulent conjugate heat transfer in porous media are performed by the lattice Boltzmann method (LBM) for modelling turbulent and dispersion heat flux terms of the double-averaged energy equation. The considered porous structures are square rod arrays, staggered cube arrays and body centred cubic foam. In the LBM, the double-distribution function method which solves the distribution functions for the velocity and the internal energy is used. For the velocity and thermal fields, the D3Q27 multiple-relaxation-time method and the regularized D3Q19 single-relaxation time method are applied, respectively. A priori tests using the LES data suggest that the trends of the sum of the dispersion and volume-averaged turbulent heat fluxes can be well captured by the second order gradient diffusion model. (C) 2017 Elsevier Inc. All rights reserved.
机译:解析的大涡模拟(LESs)在多孔介质中的湍流共轭传热是通过格子Boltzmann方法(LBM)进行的,用于模拟双平均能量方程的湍流和分散热通量项。所考虑的多孔结构为方杆阵列,交错的立方阵列和体心立方泡沫。在LBM中,使用了双重分布函数方法,该函数解决了速度和内部能量的分布函数。对于速度场和热场,分别应用了D3Q27多重松弛时间方法和正则化D3Q19单一松弛时间方法。利用LES数据进行的先验测试表明,二阶梯度扩散模型可以很好地捕获色散和体积平均湍流通量之和的趋势。 (C)2017 Elsevier Inc.保留所有权利。

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