The near wall region poses numerical difficulties and current modellings are either expensive or lack universality. Using the recent DNS done on natural convection flow in an infinite channel differentially heated for (104 < Ra < 106) a scaling analysis is developed and a one-equation near-wall turbulence model is deduced. The model coupled with a Low Reynolds Number Model (LRN) in the outer region was applied to calculate natural flow for different Ra numbers. It yields good performance, computation time reduction and much better heat transfer prediction compared to the diffusive Jones Launder LRN model.

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