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• W2521281682 abstract "Existence of non-turbulent flow patches in the vicinity of the wall of a turbulent flow is known as global intermittency. Global intermittency challenges the conventional statistics approach when describing turbulence in the inner layer and calls for the use of conditional statistics. We extend the vorticity-based conditioning of a flow to turbulent and non-turbulent sub-volumes by a high-pass filter operation. This modified method consistently detects non-turbulent flow patches in the outer and inner layers for stratifications ranging from the neutral limit to extreme stability, where the flow is close to a complete laminarization. When applying this conditioning method to direct numerical simulation data of stably stratified Ekman flow, we find the following. First, external intermittency has a strong effect on the logarithmic law for the mean velocity in Ekman flow under neutral stratification. If instead of the full field, only turbulent sub-volumes are considered, the data fit an idealized logarithmic velocity profile much better; in particular, a problematic dip in the von Kármán measure $unicode[STIX]{x1D705}$ in the surface layer is decreased by approximately 50 % and our data only support the reduced range $0.41lesssim unicode[STIX]{x1D705}lesssim 0.43$ . Second, order-one changes in turbulent quantities under strong stratification can be explained by a modulation of the turbulent volume fraction rather than by a structural change of individual turbulence events; within the turbulent fraction of the flow, the character of individual turbulence events measured in terms of turbulence dissipation rate or variance of velocity fluctuations is similar to that under neutral stratification." @default.
• W2521281682 created "2016-09-30" @default.
• W2521281682 creator A5084100846 @default.
• W2521281682 creator A5090917481 @default.
• W2521281682 date "2016-09-23" @default.
• W2521281682 modified "2023-09-25" @default.
• W2521281682 title "Analyses of external and global intermittency in the logarithmic layer of Ekman flow" @default.
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• W2521281682 doi "https://doi.org/10.1017/jfm.2016.534" @default.
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