Direct numerical simulation of intermittent turbulence under stably stratified conditions

Direct numerical simulation of intermittent turbulence under stably stratified conditions

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In this paper, we simulate intermittent turbulence (also known as bursting events) in stably stratified open-channel flows using direct numerical simulation.Clear signatures of this intriguing phenomenon are observed for a range of stabilities.However, the spatiotemporal characteristics of intermittency are found to be strongly stability dependent.

In general, the bursting events are much more coastal clouds vanilla custard frequent near the bottom wall than in the upper-channel region.A steady coexistence of laminar and turbulent flows dodge dart radiator hose is detected at various horizontal planes in very stable cases.This spatially intermittent pattern is found to propagate downstream and strongly correlate with the temporal evolution of intermittency.

Lastly, a long standing hypothesis by Blackadar (1979), i.e., the strong connection between local stability and intermittent turbulence, is corroborated by this modeling study.