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Turbulent laminar patterns in shear flows without walls

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Figure

Figure 1. Uniform and banded turbulence visualised by instantaneous streamwise velocity atthe midplane, with contours from negative (blue) to positive (red) velocity
Figure 2. Waleffe flow seen as an approximation to the interior of plane Couette flow. Shownsimulations of 2000 advective time units for [horizontals) with extrema of PCF deviation profile in (b)
Figure 3. Comparison of bands in (a) plane Couette flow, (b) Waleffe flow, and (c) model Waleffe
Figure 4. Comparison of turbulent fluctuations,[for turbulent bands plotted in figure 3
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