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首页> 外文期刊>International Journal of Heat and Mass Transfer >The influence of the non-resolved scales of thermal radiation in large eddy simulation of turbulent flows: A fundamental study
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The influence of the non-resolved scales of thermal radiation in large eddy simulation of turbulent flows: A fundamental study

机译：非解析尺度的热辐射在湍流大涡模拟中的影响：基础研究

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The filtered radiative transfer equation has been solved without subgrid-scale model and compared to a-priori estimations from direct numerical simulation of statistically stationary homogeneous isotropic turbulence. The importance of the large eddy simulation non-resolved scales on the thermal radiation is analysed in this academic case. The influence of the mean and variance of temperature of the system on the subgrid-scale correlations is studied. It is shown that the turbulence-radiation interaction (TRI) is greater for low-temperature flows, where the radiative transfer is lower. Moreover, the strongest subgrid-scale correlations, which are the temperature self-correlation and the absorption coefficient-temperature correlation, have opposite effects, which suggests that it is better to neglect both correlations, instead of modelling only one. Therefore, the assumption of neglecting the TRI in LES leads to good predictions. Three-dimensional filtering effects, as well as the grid influence on non-local quantities, such as the radiation intensity, are also analysed. These effects have a local influence, but are negligible in the tested cases.
机译：过滤后的辐射传递方程无需子网格比例模型即可求解，并与统计平稳的均质各向同性湍流的直接数值模拟得出的先验估计进行了比较。在此学术案例中，分析了大涡模拟未解析尺度对热辐射的重要性。研究了系统温度的均值和方差对子网格尺度相关性的影响。结果表明，对于低温流，湍流-辐射相互作用（TRI）较大，辐射传递较低。此外，最强的子网格尺度相关性，即温度自相关性和吸收系数-温度相关性，具有相反的效果，这表明最好忽略这两个相关性，而不是仅对它们进行建模。因此，忽略LES中TRI的假设可得出良好的预测。还分析了三维滤波效果以及网格对非本地量（例如辐射强度）的影响。这些影响具有局部影响，但在测试案例中可以忽略不计。

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