A Note on Spatial Zero Crossings of Fluctuating Velocity Field in Wall Bounded Turbulent Flows
Spatial zero-crossings of fluctuating velocity and shear stress fields are investigated in a turbulent channel flow, through direct numerical simulations. It is confirmed that the Liepmann and Taylor scales resulting from spatial zero crossings coincide more or less as in experimental time-series. A simple relationship is provided for the zero-crossing frequency of shear stress signals. It is further shown that the spanwise zero-crossings of the local wall normal velocity contributes up to 80% to the dissipation near the wall.
KeywordsDirect Numerical Simulation Spanwise Direction Streamwise Vortex Turbulent Channel Flow Direct Numerical Simulation Data
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