Turbulent flow over a channel with fluid-saturated porous bed

H. C. Chan, J. M. Leu, C. J. Lai, Yafei Jia

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9 Citations (Scopus)

Abstract

The characteristics of fully developed turbulent flow in a hybrid domain channel, which consists of a clear fluid region and a porous bed, are examined numerically using a model based on the macroscopic Reynolds-averaged Navier-Stokes equations. By adopting the classical continuity interface conditions, the present model treats the hybrid domain problem with a single domain approach, and the simulated results are noted to coincide with the existing experimental data and microscopic data. The effects of porosity φ and Darcy number Da on the flow properties over and inside the porous bed are further investigated in the selected ranges of 0.6≥φ>0.8, and 1.6 × 10-4>Da>1.6 × 10-2. It has been demonstrated that the presence of the porous bed causes the significant reduction of the flow velocities inside the clear fluid region relative to that of a smooth impermeable bed, and also reduces the magnitude of the integral constant B of the velocity logarithmic distributions from its traditional value 5.25. Moreover, turbulent shear stress within the upper part of the porous bed increases significantly with the porosity φ and Darcy number Da. The thickness of turbulence penetration remains proportional to the values of porosity φ and Darcy number Da.

Original languageEnglish
Pages (from-to)610-617
Number of pages8
JournalJournal of Hydraulic Engineering
Volume133
Issue number6
DOIs
Publication statusPublished - 2007 Jun 1

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Water Science and Technology
  • Mechanical Engineering

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