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Further studies of adverse pressure gradient effects in turbulent channel flows

type de publication      communication internationale avec actes publiés
date de publication 2015
auteur(s) De Jesus A.B.; Schiavo L.A.C.A.; Azevedo Luis Fernando; Laval Jean-Philippe
conférence 22nd AIAA Computational Fluid Dynamics Conference
     dates de 22-06-2015 à 26-06-2015
     lieu Dallas, United States
     nom des actes Proceedings of the 22nd AIAA Computational Fluid Dynamics Conferenc
ISBN / ISSN 978-162410366-7
résumé Large eddy simulation (LES) results are presented for the flow around different bump profiles installed in a channel. Three bump geometries are considered in order to investigate the effects of adverse pressure gradients and changes in curvature on the mean flow profiles and Reynolds stresses. The first bump geometry studied corresponds to a configuration for which direct numerical simulation (DNS) results are available at the Reynolds number Ret = 617, based on the channel inlet friction velocity. The other two geometries are generated by modifying the rear portion of the initial bump configuration. The bump geometry is elongated in order to produce a longer adverse pressure gradient (APG) region and promote smoother curvature changes as compared to the original profile. LES computations are performed at the same Reynolds number from previous DNS, which is also used to validate LES results in the original bump. Finally, RANS results are presented for the three bump configurations. RANS computations are performed using the two-equation eddy-viscosity SST model and one Reynolds stress transport model. Moreover, further RANS computations are performed with the addition of transition models, which have improved the correlation of the RANS data with reference DNS and current LES results
mots clés Boundary layer flow; Channel flow; Computational fluid dynamics; Fluid dynamics; Geometry; Navier Stokes equations; Pressure gradient; Reynolds equation; Reynolds number
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