The effect of pulsation frequency on transition in pulsatile pipe flow

  title={The effect of pulsation frequency on transition in pulsatile pipe flow},
  author={Duo Xu and Marc Avila},
  journal={Journal of Fluid Mechanics},
  pages={937 - 951}
  • Duo XuM. Avila
  • Published 25 March 2018
  • Physics
  • Journal of Fluid Mechanics
Pulsatile flows are common in nature and in applications, but their stability and transition to turbulence are still poorly understood. Even in the simple case of pipe flow subject to harmonic pulsation, there is no consensus among experimental studies on whether pulsation delays or enhances transition. We here report direct numerical simulations of pulsatile pipe flow at low pulsation amplitude $A\leqslant 0.4$ . We use a spatially localized impulsive disturbance to generate a single turbulent… 

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  • Physics
    Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
  • 2008
It is not clear whether a critical point exists where turbulence becomes sustained or if it remains transient, so it is here aimed to clarify if conflicting results may have been caused by the different experimental and numerical protocols used to trigger turbulence in these studies.

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Experimental data and numerical calculations covering more than two decades of lifetimes are presented, showing that the lifetime does not in fact diverge but rather increases exponentially with the Reynolds number, implying that turbulence in pipes is only a transient event, and that the turbulent and laminar states remain dynamically connected, suggesting avenues for turbulence control.