Turbulence radiation interaction in channel flow with various optical depths

摘要: The present work consists of an investigation the turbulence radiation interaction (TRI) in a radiative turbulent channel flow grey gas bounded by isothermal hot and cold walls. optical thickness is varied from 0.1 to 10 observe different regimes TRI. A high-resolution finite volume method for heat transfer employed coupled with direct numerical simulation (DNS) flow. resulting effects TRI on temperature statistics are strongly dependent considered depth. In particular, contrasting role emission absorption highlighted. For low effect fluctuations causes reduction variance through dissipating action emission. On other hand, while increasing relatively high levels, dissipation balanced, at wavenumbers spectrum, preferential absorption, which increases large-scale fluctuations. significant rise can be observed as consequence length scales.