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Thermal-Hydraulics of Water Cooled Nuclear Reactors by Francesco D'Auria

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12.9.5 Turbulence

12.9.5.1 Steady RANS turbulence modeling

From the very early days of industrial CFD practice to the present time, the treatment of turbulence has been based on statistical closure models of the Reynolds-averaged Navier-Stokes (RANS) equations. The limitations of computing power available have rendered this the only feasible option, although the complexity and sophistication of the closure models employed have increased in line with advancing power. Although a large amount of research capability has been invested in steady RANS models over the past few decades, to date, no practicable model has emerged that is competent across a broad range of flows featuring diverse states of strain. Over one hundred RANS models or model variants ...

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