Experimental and CFD Analyses Using Two-Dimensional and Three-Dimensional Models for Invert Traps in Open Rectangular Sewer Channels
Publication: Journal of Irrigation and Drainage Engineering
Volume 143, Issue 5
Abstract
For the numerical modeling of invert traps in open channels, earlier investigators used a fixed lid model (assuming closed conduit flow with the top wall as a shear free wall) with a stochastic discrete phase model (DPM). This approximate model was poorly validated with the experimental data. In the present study, experimentation has shown that the free-water surface rises above the central opening (slot) above the invert trap, which cannot be modeled using a fixed lid model. Therefore, in the present study, without making such assumptions, the appropriate computational fluid dynamics (CFD) model for open-channel flow, i.e., volume of fluid (VOF) model along with stochastic DPM has been used. Two-dimensional (2D) and three-dimensional (3D) analyses show that 2D predicts slightly lower trap efficiencies than 3D, which is theoretically justified because in 3D, more sediment falls into the trap due to their low velocity near the walls, as also observed experimentally, giving higher values of trap efficiency, which is contrary to the presumptions of the earlier investigators that the 3D model will predict lower values than the 2D model. Although, 2D predicts the same qualitative results as the 3D one but quantitatively, the 3D model predicts the best results.
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Published In
Journal of Irrigation and Drainage Engineering
Volume 143 • Issue 5 • May 2017
Copyright
©2016 American Society of Civil Engineers.
History
Received: Apr 28, 2016
Accepted: Sep 8, 2016
Published online: Dec 8, 2016
Published in print: May 1, 2017
Discussion open until: May 8, 2017
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