Numerical Simulation of Hydraulic Jump on Corrugated Bed Using FLUENT Model
Message:
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.
Language:
Persian
Published:
Journal of Water and Soil Science, Volume:20 Issue: 2, 2011
Page:
83
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