Boundary Layer Characterization during Impulsive Spin-up and Spin-down Motions of High-Reynolds Number Rotating Flow - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2017

Grenzschichtcharakterisierung während schneller Spin-up und Spin-down Vorgänge in rotierenden Strömungen bei großen Reynoldszahlen

Boundary Layer Characterization during Impulsive Spin-up and Spin-down Motions of High-Reynolds Number Rotating Flow

Résumé

Various planar and stereo PIV measurements have been conducted for high-Re in a rotating tank during spin-up and spin-down with the purpose to characterize the side-wall boundary-layer development and corresponding vorticity distributions. The effect of Ekman pumping was successfully suppressed with an additional saltwater layer. An algorithm was developed to identify distinct patterns such as Görtler vortices and transition. Despite a linearly stable character, the spin-up showed transition turbulent for high Reynolds numbers. It is hypothesized that shear-layer instabilities trigger the transition process for high velocities combined with extremely small wall curvature.
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Dates et versions

hal-01648233 , version 1 (25-11-2017)

Identifiants

  • HAL Id : hal-01648233 , version 1

Citer

Malte von Der Burg, Frieder Kaiser, Davide Gatti, B Schmidt, Joël Sommeria, et al.. Boundary Layer Characterization during Impulsive Spin-up and Spin-down Motions of High-Reynolds Number Rotating Flow. Fachtagung Experimentelle Strömungsmechanik, Sep 2017, Karlsruhe, Germany. ⟨hal-01648233⟩

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