Three dimensional CFD modeling of flow structure in compound channels.

Usman Ghani; Peter Richard Wormleaton; Hashim Nisar Hashmi

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Three dimensional CFD modeling of flow structure in compound channels.

Author(s)

Usman Ghani Department of Civil Engineering, University of Engineering and Technology, Taxila, Pakistan

Peter Richard Wormleaton Department of Engineering, Queen Mary, University of London, United Kingdom

Hashim Nisar Hashmi Department of Civil Engineering, University of Engineering and Technology, Taxila, Pakistan

Abstract

The computational modeling of three dimensional flows in a meandering compound channel has been performed in this research work. The flow calculations are performed by solving 3D steady state continuity and Reynolds averaged Navier-Stokes equations. The turbulence closure is approximated with standard-turbulence model. The model equations are solved numerically with a general purpose software package. A comprehensive validation of the simulated results against the experimental data and a demonstration that the software used in this study has matured enough for investigating practical engineering problems are the major contributions of this paper. The model was initially validated. This was achieved by computing streamwise point velocities at different depths of various sections and depth averaged velocities at three cross sections along the main channel and comparing these results with experimental data. After the validation of the model, predictions were made for different flow parameters including velocity contours at the surface, pressure distribution, turbulence intensity etc. the results gave an overall understanding of these flow variables in meandering channels. The simulation also established the good prediction capability of the standard k-ε turbulence model for flows in compound channels.

Publication Details

Page(s) 557-568

DOI DOI not available

Published Journal: Mehran University Research Journal of Engineering and Technology, Volume: 29, Issue: 4, Year: 2010

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