Turbulence schemes for modelling a submerged hydraulic jump

In this paper, a submerged hydraulic jump is modelled using k–ε and renormalisation group (RNG) turbulent schemes with standard coefficients. The computed results of mean and turbulent flow properties for three different cases of inlet Froude number and submergence ratio are compared with the measured data. The results show that the longitudinal velocity profile and its maximum value in the vertical direction are estimated better by the RNG model. Both schemes overpredict the water surface level within the recirculation zone for higher Froude numbers. The longitudinal velocities in the shear layer near the inlet are overpredicted by the two schemes. The longitudinal extent and the magnitude of reverse velocities are predicted well by both schemes. The vertical profiles of kinetic energy per unit mass are predicted well away from the inlet. Near the inlet the trends are predicted well; however, both the magnitude and the height above the bed at which the maximum kinetic energy occurs are overpredicted. The three-dimensional nature of the flow, especially near the inlet is also shown.