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Trias, F.X. (author), Soria, M. (author), Oliva, A. (author), Verstappen, R.W.C.P. (author)Since direct numerical simulations (DNS) of natural convection in a differentially heated cavity can not be performed at high Ra-numbers, a dynamically less complex mathematical formulation is sought. In the quest for such a formulation, we consider regularizations (smooth approximations) of the nonlinearity. The regularization method basically...conference paper 2006