Non-asymptotic elastoinertial turbulence for asymptotic drag reduction
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Maximum drag reduction (MDR) by polymers is recently depicted as asymptotic
convergence to a state of elastointertial turbulence (EIT) where inertia-driven
turbulence (IDT) vanishes. This theory has difficulty explaining the
universality of MDR -- asymptotic convergence of drag reduction (DR) with
increasing elasticity. We confirm that EIT is indeed non-asymptotic in DR.
Asymptotic DR is only achieved when IDT is triggered and quenched
intermittently from EIT, in a manner similar to the earlier framework based on
active-hibernating-bursting (AHB) cycles.