Three-dimensional numerical simulation of dam-break flood routing in the complex inundation areas

Numerical simulation of dam-break flood provides a scientific basis for dam-break disaster analysis. Coupled with the VOF method, a three-dimensional k-e turbulence mathematical model was established for the dam-break flood routing in the complex inundation area. Considering the water-storage and the water-blocking roles of buildings, equivalent roughness method was used in the treatment of complex underlying surface. A mesh model of hexahedral grid elements was established by the use of the unstructured body-fitted grid technology. The discrete forms in space and time were the second-order LUD format and the second-order Crank-Nicholson format respectively, and PISO algorithm was employed. The accuracy of the model was verified by the experimental results of Testa and others. A simulation on Dongwushi reservoir dam-break flood routing in the downstream complex inundation areas was applied. The simulation results were analyzed, and the dam-break flood risk maps were made.