The present work reports the comparison of different k-eps turbulence models for two-dimensional, differentially heated, rectangular enclosures. The comparison is related to the proiposed Benchmark excercise for the 22o Eurotherm/Ercoftac Workshop, i.e. a side-heated square cavity with a fluid with a Prandtl number of 0.71 and a Rayleigh number of 5x10^10, but further results are reported for enclosures with different aspect ratios and different Pr and Ra numbers, when experimental data are available. From the comparison, it is concluded that the standard k-eps turbulence model leads to severe errors in the prediction of mean quantities very close to the wall, like the heat transfer rate, while better agreement with the experiments is obtained with selected low-Reynolds-Number k-eps models.
