Numerical Simulation of Hydraulic Jump on Corrugated Bed Using FLUENT Model

Document Type : Research Paper

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Abstract

Hydraulic jump has been used for dissipation of kinetic energy downstream of hydraulic structures
such as spillways, chutes and gates. It is found by many researches that if jumps are made to occur
on a corrugated bed, tail water and length of jumps will be reduced significantly. During formation
of hydraulic jump on a corrugated bed the flow is turbulent, with water and air being mixed
together. In the present study numerical simulations of hydraulic jump on corrugated bed were done
by the CFD's FLUENT software in two dimensions using standard k-ε and RNG k-ε models. The
free surface was determined using the VOF method. The results showed that the k-ε turbulent
models and VOF method for predicting water surface in the jump on the corrugated bed were
suitable and the relative error of the predicted water surface profiles and measured values were
within 2-7 %. The study of the axial velocity profiles at different sections in the jump showed that
velocity profiles in different experiments were similar and the agreement between the experimental
and numerical results was satisfactory. Also the effects of corrugations on the basic characteristics
of the jump such as free surface location, velocity and shear stress distributions were studied for
different values of Froude number.

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References

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