Linking dissipation, anisotropy, and intermittency in rotating stratified turbulence at the threshold of linear shear instabilities
Analyzing a large database of high-resolution three-dimensional direct numerical simulations of decaying rotating stratified flows, we show that anomalous mixing and dissipation, marked anisotropy, and strong intermittency are all observed simultaneously in an intermediate regime of parameters in which both waves and eddies interact nonlinearly. A critical behavior governed by the stratification occurs at Richardson numbers of order unity and with the flow close to being in a state of instability. This confirms the central dynamical role, in rotating stratified turbulence, of large-scale intermittency, which occurs in the vertical velocity and temperature fluctuations, as an adjustment mechanism of the energy transfer in the presence of strong waves.
document
https://n2t.org/ark:/85065/d73r0x0t
eng
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publication
2016-01-01T00:00:00Z
publication
2019-10-01T00:00:00Z
Copyright 2019 AIP Publishing.
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