Smoothed Particle Hydrodynamic Modeling of Hydraulic Jumps

In this thesis the capabilities of the Smooth Particle Hydrodynamic (SPH) method to accurately capture the main features of a hydraulic jump have been investigated. Two conceptually different modeling approaches were tested, the Tank and Inflow approach. The Tank approach incorporated the modeling of a large reservoir tank which in the other case was replaced with an inlet condition. Successful outcomes were achieved for the Tank case but not for the more efficient and less computationally costly Inflow case due to poorly implemented boundary conditions in the software. Comparison of numerical results with theoretical derived values for the Tank case showed systematic under predicted of the velocity in the fast moving jet just after the gate opening. Furthermore, the depth past the turbulent roller region showed a continuously decreasing error when compared with theory which indicates a non-fully developed hydraulic jump at the early stages of the simulation. Comparison with previous work showed both under and over estimation of specific parameters which indicates that the number of particles chosen to represent the system affects the outcomes as roughly seven times more particles was used in this thesis as compared to previous work. Despite these deviations from theory and previous work, the main conclusion is that the SPH-method is a viable tool when performing free-surface flow and particularly hydraulic jump simulations.Validerat; 20110406 (anonymous