AbstractIn this paper some numerical predictions are presented for the buoyancy‐driven turbulent flow and heat transfer in a large cavity using both a prescribed eddy viscosity model and ak–ϵ model. The results from these models are in good agreement, although the calculations with the prescribed eddy viscosity model are considerably cheaper. The results also show the correct qualitative behaviour, but there are some differences between the predictions and the available experimental data. Possible reasons for these are discu