## Personne : Maciel, Yvan

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Maciel
Yvan
##### Affiliation
Université Laval. Département de génie mécanique
ncf11860329

## Résultats de recherche

Voici les éléments 1 - 4 sur 4
• Publication
Accès libre
(Cambridge University Press, 2018-02-22) Maciel, Yvan; Wei, Tie; Güngör, Ayşe Gül; Simens, Mark P.
A clear and consistent framework for the analysis of the outer region of adverse-pressure-gradient turbulent boundary layers is established in this paper based on basic principles and theory, and the help of six adverse-pressure-gradient turbulent boundary layer databases and a zero-pressure-gradient one. Outer velocity and length scales for the mean velocity defect and the Reynolds stresses are discussed first. The conditions of validity of four velocity scales are determined in terms of the shape factor, since one scale is restricted to small velocity-defect boundary layers (the friction velocity 𝜏 ), one to large-defect ones (the pressure-gradient velocity ), while the two others are proper scales for all velocity-defect conditions (the Zagarola–Smits velocity and the mixing-layer-type velocity ). The turbulent boundary layer equations are then used to bring out, in a consistent manner and without assuming any self-similar behaviour, a set of non-dimensional parameters characterizing the outer region of turbulent boundary layers with arbitrary pressure gradients. In terms of a generic outer length scale and velocity scale , these non-dimensional parameters are the pressure-gradient parameter 𝛽𝜌 , the Reynolds number 𝜈 and the inertial parameter 𝛼 , where and are respectively the streamwise and wall-normal components of mean velocity at the boundary layer edge. These parameters have a clear physical meaning: they are ratios of the order of magnitude of forces, with the Reynolds shear stress gradient (apparent turbulent force) as the reference force – inertial to apparent turbulent forces for 𝛼 , pressure to apparent turbulent forces for 𝛽 and apparent turbulent to viscous forces for . We discuss at length their significance and determine under what conditions they retain their meaning depending on the outer velocity scale that is considered. The seven boundary layer databases are analysed and compared using the established framework. An astonishing and impressive result is obtained: by choosing , the streamwise evolution of the three ratios of forces in the outer region can be accurately followed with 𝛽 , 𝛼 and in all these flows – not just the order of magnitude of these ratios. This cannot be achieved with 𝜏 and , and only imperfectly with . Consequently, 𝛽 , 𝛼 and can be used to follow – in a global sense – the streamwise evolution of the streamwise mean momentum balance in the outer region.
• Publication
Restreint
Secondary flow and roll cells interaction in high-aspect-ratio rotating turbulent duct flows
(Gordon and Breach Publishing Group, 2008-04-02) Julien, Steve; Dumas, Guy; Torriano, Federico; Maciel, Yvan
End-wall effects for high aspect ratio (AR) turbulent duct flows under moderate spanwise rotation are investigated using Reynolds-Averaged Navier–Stokes (RANS) calculations with a Reynolds stress turbulence closure model. It is shown that despite an important uniformisation of the mean streamwise flow compared to the non-rotating case, the channel flow solution (AR ¼ 1) is not recovered in practical high AR ducts used in experiments. The unavoidable end-wall generated secondary flow causes transverse advection which is capable of altering the mean velocity profile, even for AR as high as 22. In addition, for Re ¼ 40,000 and Ro ¼ 0.22, persistent longitudinal roll cells are found in the RANS solutions. The results suggest that their interaction with the secondary flow may challenge the prospect of formally reaching a steady, streamwise invariant regime in actual rotating duct experiments.
• Publication
Accès libre
Coherent structures in a non-equilibrium large-velocity-defect turbulent boundary layer
(Springer, 2016-04-25) Maciel, Yvan; Simens, Mark P.; Gungor, Ayse G.