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Turbulent flow in smooth rectangular duct - Numerical vs. Literature correlationsHallo,
I have done simulations of a turbulent air flow in a smooth rectangular duct. I compared my numerical results of pressure drop (friction factor) with literature correlations. Here follows a brief summary of my simulation (because of symmetry I have only simulated one-fourth of the duct): Fluid: air with costant properties Turb model: k-w standard y+: everywhere below 2.5 and above 0.8 Inlet B.C.: mass flow inlet Outlet B.C.: outflow Reynolds number: 7666 I compared my results for the pressure drop (or friction factor) with some literature correlations, e.g. f=(1.82*log_10 Re -1.64)^-2 and I have found a mean discrepancy of 12%. I have also performed a sensitivity analysis on the grid but the results do not change. Can anyone inform me if such a discrepancy is acceptable or if it is typically possible to obtain a better agreement between numerical simulations and literature correlations for the friction factor (or pressure drop)? Thank you in advance, marluc |

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