In Taylor-Couette flow with sufficiently strong counter-rotating cylinders, the turbulence near the outer cylinder shows intermittent oscillations in form of turbulent bursts. We present this phenomenon in direct numerical simulations for radius ratios η = 0.5 and 0.71 and identify a critical value in the rotation ratio µ for its onset. We propose a physical model for this critical value that also rationalizes the observed agreement with the rotation ratio of the torque maximum. While this model conforms well with the observations for these radius ratios, it most likely has to be refined or replaced for η → 1, as further simulations for η ≥ 0.9 show.
|Title of host publication||Proceedings of the 14th European Turbulence Conference|
|Number of pages||2|
|Publication status||Published - 2013|
|Event||14th European Turbulence Conference, ETC 2013 - Lyon, France|
Duration: 1 Sep 2013 → 4 Sep 2013
|Conference||14th European Turbulence Conference, ETC 2013|
|Period||1/09/13 → 4/09/13|