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HomeConstruction Technologies and ArchitectureConstruction Technologies and Architecture Vol. 17Numerical Investigation of Flow Dynamics in a...

Numerical Investigation of Flow Dynamics in a Sharp-Crested Weir with Variable Geometry

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Abstract:

The diverse flow patterns observed in open channels with weir-type structures are common in natural environments such as rivers. However, the complex flow dynamics in these settings remain only partially understood. To address this research gap, a rectangular sharp-crested weir with variable geometric ratios crest heights (H/P) and widths (H/B) was numerically analyzed using CFD modeling in ANSYS Fluent. The primary objective of this study is to provide detailed numerical insights into flow characteristics over sharp-crested weirs with varying H/P and H/B, where H represents the head over the weir, P the weir height, and B the weir width. Discharge capacity and turbulent intensity profiles and contours were generated and compared across four different cases (Cases A-D). The findings demonstrate that changes in geometric parameters significantly influence flow behavior, particularly by affecting discharge rates and turbulence intensity. These results reveal the presence of complex, wide-ranging flow motions similar to those observed in natural open channels, highlighting the impact of weir geometry on overall flow dynamics.

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14th International Civil Engineering Conference

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Periodical:

Construction Technologies and Architecture (Volume 17)

Pages:

191-201

DOI:

https://doi.org/10.4028/p-6HoW46

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Online since:

April 2025

Authors:

Naveed Anjum, Jawad Ashraf*, Muhammad Ahmad, Usman Ghani, Mohammad Hamza, Asif Aziz

Keywords:

Computational Fluid Dynamics (CFD), Flow Dynamics, Open Channel Flow, Sharp-Crested Weir, Weir Geometry Variation

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