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Abstract
A comparison is made between the numerical results obtained by 10 groups for a standard test case, which was defined for turbulent natural-convection flow in enclosures. The standard case considers air at a Rayleigh number of 5 × 1010in a square, differentially heated enclosure with adiabatic horizontal walls. The turbulence is modeled by a standard k-ϵ model. Some contributions find a strong grid dependence of the transition point in the vertical boundary layers, which prevents finding the grid-independent solution. In some contributions the boundary condition for e on the wall leads to convergence problems. The solution that shows the best agreement with half of the contributions is taken as the numerical reference solution.