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We study the evolution of the Knudsen and Reynolds numbers in(0+1)-dimensionally expanding fluids with Bjorken symmetry for systems whosemicroscopic mean free path rises more quickly with time than usually assumed.This allows us to explore within a simple 1-dimensional model the transitionfrom initially thermalizing to ultimately decoupling dynamics. In all casesstudied the dynamics is found to be controlled by hydrodynamic attractors forboth the Knudsen and Reynolds numbers whose trajectories undergo characteristicchanges as the dynamics changes from thermalizing to decoupling.

Hydrodynamics from free-streaming to thermalization and back again