Numerical study on turbulent mixed convection in plane channel is carried out with low-Reynolds number k-ε model coupled with radiation model. Results are compared with experimental data in open literatures. Traditional LS low-Reynolds model and advanced low-Reynolds model SZS low-Reynolds model have been used to compare with experimental data. Results show that there is no general privilege of SZS model over LS model. Although SZS gives better results of mean velocity, it gives too large Nusselt number due to the too larger budget of turbulent shear stress. It is also shown from numerical study that radiation plays a great part especially under the great buoyancy influenced condition.

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