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The Relevance of a Back-Scatter Model for Depth-Averaged Flow Simulation

  • Bram C. van Prooijen
  • Wim S. J. UijttewaalEmail author
Open Access
Article

Abstract

This study demonstrates the importance of a sophisticated sub-grid model when performing a depth-averaged unsteady RANS simulation of a shallow flow. The reduction of resolution and the spatial dimensions exclude important physical processes as present in three-dimensional turbulence. Especially the effect of the bottom turbulence on the formation of horizontal eddies appears of key importance. A method is proposed to incorporate these effects by means of a kinematic simulation that mimics the residual turbulent fluctuations in a straight channel flow after depth-averaging. This method is developed in the context of the evolution of large eddies in a shallow mixing layer. A comparison with experiments shows that the proposed method works satisfactory. Naturally, it does not fully account for the omission of all 3D-effects.

Keywords

Open channel Large eddy simulation Shallow flow Mixing layer 

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Copyright information

© The Author(s) 2008

Authors and Affiliations

  • Bram C. van Prooijen
    • 1
  • Wim S. J. Uijttewaal
    • 2
    Email author
  1. 1.Hydraulic Engineering Section, Faculty of Civil Engineering and GeosciencesDelft University of TechnologyDelftThe Netherlands
  2. 2.Environmental Fluid Mechanics Section, Faculty of Civil Engineering and GeosciencesDelft University of TechnologyDelftThe Netherlands

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