Turbulent Von Kármán flow between two counter-rotating disks

Sébastien Poncet (1) , Roland Schiestel (2) , Romain Monchaux (3)

1 M2P2 - Modélisation et Simulation Numérique (en mécanique des fluides)
2 IRPHE - Institut de Recherche sur les Phénomènes Hors Equilibre
3 SPEC - UMR3680 - Service de physique de l'état condensé

The present work considers the turbulent Von Kármán flow generated by two coaxial counter-rotating smooth (viscous stirring) or bladed (inertial stirring) disks enclosed by a cylindrical vessel. Numerical predictions based on one-point statistical modeling using a low Reynolds number second-order full stress transport closure (RSM) are compared to velocity measurements performed at CEA. An efficient way to model the rule of straight blades is proposed. 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 the dynamics and the turbulence properties in the Von Kármán configuration. In particular, we highlighted the transition be-tween the Batchelor and the Stewartson flow structures and the one between the merged and separated boundary layer regimes 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.

Mots clés: Von Kármán flow; counter-rotating disks; turbulence modeling; Reynolds stress model

Domaines: Mécanique des fluides [physics.class-ph]; Mécanique des fluides [physics.class-ph]

Sébastien Poncet, Roland Schiestel, Romain Monchaux. Turbulent Von Kármán flow between two counter-rotating disks. 8th ISAIF, Jul 2007, Lyon, France. pp.141-150. ⟨hal-00170265⟩