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|Type:||Artigo de evento|
|Title:||Large Eddy Simulations Of Turbulent Flows With Adverse Pressure Gradients|
|Abstract:||The work presents comparative results between wall friction and pressure coefficient predictions from Large Eddy Simulation (LES) and Reynolds-averaged Navier-Stokes (RANS) computations in channel flows with an adverse pressure gradient created by a 2-D bump. Reynolds numbers range from Reτ = 617 to 2000, based on the friction velocity at the channel inlet. LES produces very consistent results when compared to DNS or other highly resolved LES. Twoequation and seven-equation RANS models are found to correctly predict friction coefficients in zero and favorable pressure gradient regions, but they fail in regions of adverse pressure gradients. The Reynolds stress transport model shows a better performance when compared to two-equation eddy-viscosity models, particularly in the higher Reynolds number cases. However, none of the RANS models is able to capture the full physics of turbulence related with adverse pressure gradients. Such limitations seem 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.|
|Editor:||International Council of the Aeronautical Sciences|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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