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Spatial evolution of turbulence characteristics in weak hydraulic jumps

Author(s): Emmanuel Mignot; Rodrigo Cienfuegos

Linked Author(s): Emmanuel Mignot, Rodrigo Cienfuegos

Keywords: Approach flow; experimentation; hydraulic jump; inflow development; turbulent kinetic energy

Abstract: This experimental investigation focuses on the turbulence features of weak hydraulic jumps in rectangular channels for two different approach flow lengths. The turbulent kinetic energy equation includes the turbulence production and dissipation terms, two advection and two turbulent transport terms and the pressure transport term, which could not be measured, however. For jumps with a limited approach flow length, the turbulence production is mostly confined to the shear layer, while for jumps with a longer approach flow length, an additional peak turbulence production region is observed at the near-wall region due to boundary layer separation. The turbulent energy is then transported by the mean flow both towards the free surface and into the downstream direction and is diffused by turbulent processes away from the energetic shear layer towards less energetic regions. Dissipation occurs mostly in the shear layer along the upstream portion of the jump and over most of the flow depth further downstream.


Year: 2011

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