Turbulent puffs in strongly pulsatile pipe flow survive by exploiting transient instabilities in the laminar Sexl-Womersley profile, in addition to mean-shear production, as shown by causal DNS and an extended Barkley model.
See an example of this behavior in figure 1b
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Turbulent puffs in transitional pulsatile pipe flow at moderate pulsation amplitudes
Turbulent puffs in strongly pulsatile pipe flow survive by exploiting transient instabilities in the laminar Sexl-Womersley profile, in addition to mean-shear production, as shown by causal DNS and an extended Barkley model.