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Smooth rectabgular duct - Simulation vs. Literature correlations |
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July 7, 2011, 06:59 |
Smooth rectabgular duct - Simulation vs. Literature correlations
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#1 |
Member
Luca
Join Date: Mar 2011
Location: Italy
Posts: 62
Rep Power: 15 |
Hallo,
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 (Gnielinski) and I have foud 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 simulation and literature correlation for the friction factor (or pressure drop)? Thank you in advance, marluc |
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September 22, 2023, 08:07 |
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#2 |
New Member
Alex Lee
Join Date: Aug 2023
Posts: 7
Rep Power: 3 |
Hello, I'm sorry to bother you. Although this has been a post for many years, I have also encountered similar situations. Can you tell me how you resolved this issue in the end?
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September 25, 2023, 12:36 |
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#3 |
Senior Member
Erik
Join Date: Feb 2011
Location: Earth (Land portion)
Posts: 1,183
Rep Power: 23 |
You have to make sure you are comparing apples to apples.
Make sure your inlet or outlet effects are not influencing your results comparisons, and total pressure effects from changing cross sections or compressible flows are also considered correctly in the comparison. |
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Tags |
pressure drop, smooth duct, turbulent flow, validation |
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