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The transition to turbulence in a long, straight pipe is one of theoutstanding unresolved problems in classical Physics. It is well-established byexperiments that a finite amplitude disturbance is required to trigger thetransition to turbulence from laminar flow. Details of the processes involvedin the transition are mysterious and a full understanding of them remainsaloof. Here we take the novel approach of initiating the flow in a turbulentstate and then reducing the flow rate suddenly, a so-called quench, so that theflow decays from turbulence. We use two distinct methods of driving the flowand find that the dynamical processes involved in the decay, as well as thefraction of the flow that remains turbulent, are qualitatively distinct foreach driving protocol.

Driving determines the dynamics in transitional pipe flows