ANALYSIS OF ENERGY DISSIPATION PHENOMENON AT VERTICAL FALL USING COMPUTATIONAL FLUID DYNAMICS MODELING - A CASE STUDY OF LOWER GOGERA BRANCH CANAL PAKISTAN
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Keywords:
Numerical Modelling, Canal Fall, Hydraulic Jump, Energy Dissipation, Flow-3DAbstract
In this work experimental and numerical investigations were carried out to study the energy
dissipation at the downstream of the vertical fall of Lower Gogera Branch Canal (LGBC) using CFD
software and compared the results with a comprehensive physical model constructed in the model tray
hall of Centre of Excellence in Water Resource Engineering, UET, Lahore for validation of numerical
model. The study has considered two case scenarios. The first model was the original vertical drop having
a drop of 3.69 m having stilling basin at the downstream and the second model was prepared by providing
the baffle blocks at the downstream to dissipate the energy. The discharge passing through this fall is
63.73 m3/s. The baffle blocks were designed according to the specifications provided in the USBR
manual for small Hydraulic structures. To simulate the free flow surface, the volume of fluid (VOF)
method, and the Renormalization Group (RNG) were adopted in the FLOW-3D software. The results
highlighted that the numerical model shows proper coordination with experimental results and the
difference between the amount of energy calculated using physical and numerical model is within 5%.
Moreover, the use of baffle blocks at the downstream of the fall was found to be effective to dissipate
energy and reduce the velocity to some extent resulting in the safety of structure.
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