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Article Dans Une Revue International Journal of Heat and Fluid Flow Année : 2008

Turbulence modeling of the Von Karman flow: viscous and inertial stirrings

Résumé

The present work considers the turbulent Von Karman flow generated by two counter-rotating smooth flat (viscous stirring) or bladed (inertial stirring) disks. Numerical predictions based on one-point statistical modeling using a low Reynolds number second-order full stress transport closure (RSM model) are compared to velocity measurements performed at CEA (Commissariat à l'Energie Atomique, France). The main and significant novelty of this paper is the use of a drag force in the momentum equations to reproduce the effects of inertial stirring instead of modelling the blades themselves. The influences of the rotational Reynolds number, the aspect ratio of the cavity, the rotating disk speed ratio and of the presence or not of impellers are investigated to get a precise knowledge of both the dynamics and the turbulence properties in the Von Karman configuration. In particular, we highlighted the transition between the merged and separated boundary layer regimes and the one between the Batchelor (1951) and the Stewartson (1953) flow structures in the smooth disk case. We determined also the transition between the one cell and the two cell regimes for both viscous and inertial stirrings.
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Dates et versions

hal-00202922 , version 1 (08-01-2008)

Identifiants

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Sébastien Poncet, Roland Schiestel, Romain Monchaux. Turbulence modeling of the Von Karman flow: viscous and inertial stirrings. International Journal of Heat and Fluid Flow, 2008, 29 (1), pp.62-74. ⟨10.1016/j.ijheatfluidflow.2007.07.005⟩. ⟨hal-00202922⟩
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