Abstract
An analysis of the turbulence-radiation interaction in the framework of large eddy simulation (LES) is presented. Direct numerical simulation (DNS) of statistical steady forced homogeneous isotropic turbulence is used to evaluate the relevance of the unclosed terms of the filtered radiative transfer equation (RTE) and to study the influence of parameters like the optical thickness and the turbulence intensity. LES without subgrid-scale models of the filtered RTE has also been investigated. Neglecting the subgrid-scale fluctuations of radiation has proved to be an accurate assumption in various cases, especially for the absorption terms of radiation. However, turbulence-radiation interaction effects increase significantly with the optical thickness based on the size of the filter or with the turbulence intensity, and consequently subgrid-scale modelling should be developed in cases where the optical thickness is not thin and the turbulence intensity higher than 20%.
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