Comparative study of experimental and CFD analysis for predicting discharge coefficient of compound broad crested weir

Present study highlights the behavior of the weir crest head and width parameter on the discharge coefficient of a compound broad crested (CBC) weir. Computational fluid dynamics model (CFD) is validated with laboratory experimental investigations. In the discharge analysis through broad crested wei...

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Bibliographic Details
Published in:Water science & technology. Water supply 2022-03, Vol.22 (3), p.3283-3296
Main Authors: Kulkarni, Ketaki H., Hinge, Ganesh A.
Format: Article
Language:English
Subjects:
Analysis
Broad-crested weirs
Coefficients
Comparative analysis
Comparative studies
compound weir
Computational fluid dynamics
Computer applications
Correlation coefficient
Correlation coefficients
Design
Discharge coefficient
flow 3d
flow measurement
Fluid dynamics
Free surfaces
Hydraulics
Hydrodynamics
Investigations
Laboratories
Laboratory experimentation
Mathematical models
Measurement techniques
numerical technique
open channel
River beds
Simulation
Software
Three dimensional flow
Three dimensional models
Turbulence models
Velocity
Water depth
Weirs
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Summary:Present study highlights the behavior of the weir crest head and width parameter on the discharge coefficient of a compound broad crested (CBC) weir. Computational fluid dynamics model (CFD) is validated with laboratory experimental investigations. In the discharge analysis through broad crested weirs, the upstream head over the weir crest (h) is crucial, where the result is mainly dependent upon the weir crest length (L) in the transverse direction to flow, water depth from channel bed. Currently, minimal investigations are known for CFD validations on compound broad crested weirs. The hydraulic research for measuring discharge numerically is carried out using FLOW 3D software. The model applies renormalized group (RNG) using the volume of fluid (VOF) method for improved accuracy in free surface simulations. Structured hexagonal meshes of cubic elements define discretized meshing. The comparative analysis of the numerical simulations and experimental observations confirm the performance of the CBC weir for precise measurement of a wide range of discharges. Series of CFD model studies and experimental validation have led to constant range of discharge coefficients for various heads over the weir crest. The correlation coefficient of discharge predictions is 0.999 with mean error of 0.28%.
ISSN:1606-9749
1607-0798
DOI:10.2166/ws.2021.403