Large-eddy simulation of a supersonic channel flow between isothermal walls at different temperatures is performed to study radiation effects using a fictitious gray gas model. The simulations are carried out at two different resolutions to ascertain the effects of subgrid scales on radiation. Effects of radiation on the mean temperature, on RMS temperature fluctuations as well as on the turbulence structure are presented. For the moderate optical thickness of the flow considered here, the effects of subgrid scales on the radiative heat transfer are found to be small.
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