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Water 2018, 10(1), 75; doi:10.3390/w10010075

To Investigate the Flow Structure of Discontinuous Vegetation Patches of Two Vertically Different Layers in an Open Channel

1
Department of Civil Engineering, University of Engineering & Technology, Taxila 47050, Pakistan
2
Department of Civil Engineering, University College of Engineering BZU, Multan 60000, Pakistan
3
Department of Civil Engineering, National University of Computer & Emerging Sciences (FAST), Lahore 54000, Pakistan
*
Author to whom correspondence should be addressed.
Received: 12 November 2017 / Revised: 11 January 2018 / Accepted: 12 January 2018 / Published: 16 January 2018
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Abstract

In the present study, the flow structure of discontinuous double-layered vegetation patches was investigated using a 3D Reynolds stress turbulence model (RSM). The channel domain was built using GAMBIT (Geometry and Mesh Building Intelligent Toolkit). For the simulation and postprocessing, FLUENT (ANSYS) was used to analyze the distribution of the mean velocity, Reynolds stresses, and other flow properties against two different flow conditions. The results captured by the turbulence model at specific locations and the cross section are presented in the form of various velocity profiles and contour plots. In the gap portion, the velocity was visibly lower than that in the vegetation areas, while the influence of patch distribution was not visible in the overlying flow layer. The velocity profiles at critical locations were categorized by numerous modulation points and velocity projections close to the bed, principally for positions straight after the vegetation structures. A distinction in the velocity at the topmost of the smaller vegetation structure was prominent. Reynolds stresses, turbulent kinetic energy, and turbulence intensity exhibited large fluctuations inside the vegetation regions and just behind the vegetation structures compared with in the gap regions. View Full-Text
Keywords: layered vegetation; discontinuous patches; open channel flow; numerical simulation; flow characteristics; turbulence model layered vegetation; discontinuous patches; open channel flow; numerical simulation; flow characteristics; turbulence model
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Anjum, N.; Ghani, U.; Ahmed Pasha, G.; Latif, A.; Sultan, T.; Ali, S. To Investigate the Flow Structure of Discontinuous Vegetation Patches of Two Vertically Different Layers in an Open Channel. Water 2018, 10, 75.

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