The contribution presents numerical simulations of dam-break flow in channel expansion using the SPH method. Smoothed particle hydrodynamics (SPH) is a meshless method for simulation of hydrodynamics phenomena. The SPH method requires larger number of computational elements and consequently a longer computational time. Thereforethe new methodologies have been developed as for example coupling between models of different resolutions. It was demonstrated that the proposed approach significantly shortens the computational time of the SPH method without decreasing the accuracy of results significantly.
COBISS.SI-ID: 5990753
The contribution deals with hydraulic aspects of a wave, emerging as a result of a potential dam break of the upper storage reservoir of the pumped-storage hydropower plant Kolarjev vrh. A conventional two-dimensional depth-averaged mathematical approach was used. The upper storage reservoir and its dam failure were modelled with the mathematical model PCFLOW2D, which is based on the Cartesian coordinate numerical mesh. The results of PCFLOW2D were used as the upper boundary condition for the mathematical model PCFLOW2D-ORTHOCURVE, based on the orthogonal curvilinear numerical mesh. The model PCFLOW2D-ORTHOCURVE provided a tool for the analysis of flood wave flow in a steep, narrow and geometrically diversified stream channel. The classic Manning’s equation fails to give good results for streams with steep bed slopes and therefore, a different equation should be used. The application of the Rickenmann’s equation was chosen, presented in a form similar to Manning’s equation. For the purpose of the example given here, the equation was somewhat simplified and adapted to the data available. The roughness coefficient used at each calculation cell depended on the slope of that cell. The results of numerical calculations were compared to measurements carried out on a physical model in the scale of 1 : 200. Regarding the complexity of the flow phenomenon rather good correlation of maximum depth was established. In the present project this case study is used as a reference example to test the accuracy of SPH simulations in comparison to conventional methods.
COBISS.SI-ID: 5819745