This paper presents the evaluation of the turbulence radiation interaction (TRI), which is usually neglected in Reynolds averaged simulations (RAS) of computational fluid dynamics (CFD) problems. As a result of neglecting this interaction, it is obtained that the radiative heat loss in the flame and the radiative thermal load on the combustor is too low. The TRI is evaluated using the optically thin fluctuation approximation (OTFA) in coupled (radiation and CFD) calculations in a highly turbulent lean premixed methane flame. The validity of the OTFA is investigated in terms of the resulting change in temperature and reaction progress. Two common absorption-emission models are used in Monte-Carlo radiation calculations: the weighted-sum-of-grey-gases (WSGG) and the statistical narrow band correlated-absorption coefficient (SNB-CK). Both models show that the radiative thermal load on walls is increased up to 27 % due to TRI. In contrast, the flame shape is not affected since local temperatures changes are less than 25 K.

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