Hydrodynamics of flow through a degraded channel bed

We present a local analysis of turbulence in open-channel flows, by using time-series velocity measurements. The method is based on a local form of the Kolmogorov "4/3-law" of homogeneous turbulence for the third-order moment of velocity increments. Following the \citet{DuchonRobert00} idea, which envisions turbulence dissipation as a lack of smoothness of the Navier-Stokes solutions, we estimate the local energy flux in a laboratory experiment with natural bed flows. Taking advantage of one-dimensional filtering techniques, under reasonable hypothesis, simple expressions of a surrogate of the energy flux are provided. The Local Energy Flux Surrogate (LEFS) reveals that, independently of the geometry, turbulence dissipation is highly intermittent. Among a variety of eddy structures that populate turbulence, the dissipative singularities appear in sheet-like, tube and filament structures, with large amplitude variations and rotations. This simplified technique can be applied to any measurement of hydrodynamic turbulence.

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Hydrodynamics of flow through a degraded channel bed

Cited by 4 publications

References 54 publications

Structure functions of turbulence through a degraded channel bed

Structure functions of turbulence through a degraded channel bed

Turbulence anisotropy in a wall-wake flow downstream of two horizontal cylinders

The local energy flux surrogate in turbulent open-channel flows

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