Numerical Study of Hydraulic Jump on Rough Beds Stilling Basins

The hydraulic jump phenomenon is one of the most common phenomena in open channels. A hydraulic jump is a rapid transition from a supercritical flow into a subcritical flow by dissipating a lot of energy. Stilling basins bottom roughness is an important factor to control, reducing jump length and increase energy losses by hydraulic jump. In present study, 2-dimensional numerical simulation of hydraulic jump on rough beds including triangular and rectangular sheets by using standard k-? model was evaluated. The free surface was determined using the VOF method. Total of 16 simulations were simulated for a range of the Froude number from 3 to 7. The results showed that the sequent depth and length of hydraulic jump are reduced while the energy loss is increased, comparing with classic jump. Also there was a good agreement between modelled results and experimental data. The investigation resulted in some empirical relations to define the sequent depth and bed shear stress for different flow conditions on used rough beds.