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Rapidly varying flow over oblique weirs
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|Title: ||Rapidly varying flow over oblique weirs|
|Authors: ||Wols, Bas|
Uijttewaal, Wim S.J.
Stelling, Guus S.
|Keywords: ||Modeling of confined flows;Weirs;Bedforms;Computational hydraulics;Fluvial hydraulics;Hydraulic structures|
|Issue Date: ||11-Sep-2006|
|Publisher: ||Michael Piasecki and College of Engineering, Drexel University|
|Citation: ||Proceedings of the Seventh International Conference on Hydroscience and Engineering, Philadelphia, PA, September 2006. http://hdl.handle.net/1860/732|
|Abstract: ||Many obstacles in river floodplains can be considered as weirs; the flow over the obstacle varies
rapidly and gives rise to energy losses. The weir-like structure can have any angle with respect to
approach flow direction. In order to estimate the maximum conveyance capacity of a river, the
energy losses need to be known for various conditions, but in particular for submerged conditions.
In this study analytical and experimental data are compared with the results of a 3D numerical
model. The non-hydrostatic finite element model FinLab, allows for a moving free surface and has a
straightforward k −ε turbulence closure. The numerical model reproduces the experimental data
very well and allows for a more extensive evaluation of the 3D flow structure. The analytical model
reveals that the combination of energy conservation at the upstream side of the weir and momentum
conservation at the downstream side explains most of the energy losses.
For the oblique weir the assumption is verified that the velocity component parallel to the weir is
not affected while the perpendicular component can be characterized by the standard weir
formulations. The simulated separating flow downstream of the weir has interesting features with a
clear relation with the energy losses. More detailed experimental data are needed however to
validate the model on these aspects.|
|Description: ||Paper presented at The Seventh International Conference on HydroScience and Engineering (ICHE) hosted by the College of Engineering at Drexel Univeristy on September 10-13, 2006 in Philadelphia, Pennsylvania. The conference theme was IT in the Field of HydroSciences. It included several mini-symposia that emphasized IT topics in HydroSciences and the yearly meeting of the metadata group of the International Oceanographic Data and Information Exchange organization.|
|Appears in Collections:||Proceedings of the 7th International Conference on HydroScience and Engineering (ICHE 2006) [ISBN: 0977447405]|
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