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- W2555920102 abstract "Here, the mechanism behind the collapse of turbulence in the evening as a precursor to the onset of the very stable boundary layer, is investigated. To this end a cooled, pressure-driven flow is investigated by means of a local similarity model. This local similarity model is effectively a gradient-diffusion/eddy viscosity model, which was validated against atmospheric observational data and Direct Numerical Simulations in a previous study. Current simulations reveal a temporary collapse of turbulence whenever the surface heat extraction, expressed in its non-dimensional form h/L, exceeds a critical value. As any temporary reduction of turbulent friction is followed by flow acceleration, the long-term state is unconditionally turbulent. In contrast, the temporary cessation of turbulence, which may actually last for several hours in the nocturnal boundary layer, can be understood from the fact that the time scale for boundary layer diffusion is much smaller than the time-scale for flow acceleration. This limits the available momentum that can be used for downward heat transport. In case the surface heat extraction exceeds the so- called maximum sustainable heat flux (MSHF), the near-surface inversion rapidly increases. Finally, turbulent activity is largely suppressed by the intense density stratification which supports the emergence of a different, calmer boundary layer regime" @default.
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- W2555920102 date "2013-01-01" @default.
- W2555920102 modified "2023-09-23" @default.
- W2555920102 title "THE MAXIMUM SUSTAINABLE HEAT FLUX IN THE ATMOSPHERIC NOCTURNAL BOUNDARY LAYER" @default.
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