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• W2883206812 abstract "The complex flow features resulting from the laminar-turbulent transition (LTT) in a sudden expansion pipe flow, with expansion ratio of 1:2 subjected to an inlet vortex perturbation is investigated by means of direct numerical simulations (DNS). It is shown that the threshold for LTT described by a power law scaling with -3 exponent that links the perturbation intensity to the subcritical transitional Reynolds number. Additionally, a new type of instability is found within a narrow range of flow parameters. This instability originates from the region of intense shear rate which is a result of the flow symmetry breakdown. Unlike the fast transition, usually reported in the literature, the new instability emerges gradually from a laminar state and appears to be chaotic and strongly unsteady. Additionally, the simulations show a hysteresis mode transition due to the reestablishment of the recirculation zone in a certain range of Reynolds numbers. The latter depends on (i) the initial and final quasi-steady states, (ii) the observation time and (iii) the number of intermediate steps taken when increasing and decreasing the Reynolds number." @default.
• W2883206812 created "2018-08-03" @default.
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• W2883206812 date "2019-04-01" @default.
• W2883206812 modified "2023-10-15" @default.
• W2883206812 title "Perturbation threshold and hysteresis associated with the transition to turbulence in sudden expansion pipe flow" @default.
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• W2883206812 doi "https://doi.org/10.1016/j.ijheatfluidflow.2019.01.018" @default.
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