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- W2328506521 abstract "The work presents comparative results between wall friction coe cient predictions from Large Eddy Simulation (LES) and Reynolds-averaged Navier-Stokes (RANS) computations in channel ows with an adverse pressure gradient created by a two-dimensional bump. LES results are obtained using the semi-spectral code, MFLOPS3D, developed at Laboratoire de M ecanique de Lille (LML), while RANS solutions are computed using a commercial code based on 2nd-order nite volume discretization with typical two-equation turbulence models and one seven-equation Reynolds stresses transport model. Computations are performed in two bump pro les installed in a channel. Reynolds numbers range from Re = 617 to 950 based on the friction velocity at the channel inlet. It is found that LES produces very consistent results when compared to DNS or other highly resolved LES. On the other hand, RANS models are found to predict an incorrect evolution of the friction coe cient in regions of adverse pressure gradient, even if separation or re-attachment locations are correctly predicted. This limitation of RANS models is observed both in separated and attached ow situations and it seems to be related to the fact that these models do not correctly describe the evolution of the turbulent kinetic energy close to the walls in adverse pressure gradient regions." @default.
- W2328506521 created "2016-06-24" @default.
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- W2328506521 date "2013-01-05" @default.
- W2328506521 modified "2023-10-02" @default.
- W2328506521 title "Large Eddy Simulations and RANS Computations of Adverse Pressure Gradient Flows" @default.
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- W2328506521 doi "https://doi.org/10.2514/6.2013-267" @default.
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