Transition to turbulence in the rotating disk boundary layer of a rotor-stator cavity

Abstract : The transition to turbulence in the rotating disk boundary layer is investigated in a closed cylindrical rotor-stator cavity via direct numerical simulation using spectral vanishing vis-tocity method (DNS-SVV) and linear stability analysis (LSA). As shown in the Figure 1, Figure 1: Instantaneous flow pattern in the whole cavity for Re = 4 × 10 5. The stator is below. Iso-surfaces and iso-contours of the instantaneous axial velocity w. Three dimensional view. The rotor and stator boundary layers are shown for z = ±0.97H, respectively. The stator boundary layer (lower part) is already turbulent while the rotor boundary layer (upper part) remains stable until very high Reynolds number Re = U/νR then shows an organised behaviour followed by incipient turbulence. We focus on the global stability and the transition to turbulence of the rotor boundary layer. The mean flow in the rotor boundary layer is qualitatively similar to the von Kármán self-similarity solution [1].
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Eunok Yim, J.-M Chomaz, Denis Martinand, E. Serre. Transition to turbulence in the rotating disk boundary layer of a rotor-stator cavity. 20th International Couette Taylor Workshop, Jul 2018, Marseille, France. ⟨hal-02121897⟩

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