Numerical studies using staggered finite volume for dam break flow with an obstacle through different geometries

This paper aims to present a numerical study of dam break flow in the presence of an obstacle. A model based on the modified Non-Linear Shallow Water Equations with cross section and a dispersive treatment was solved numerically using a momentum-conservative finite volume method on a staggered grid. To validate the numerical model, several benchmark tests were carried out. Comparison of the computed results with the analytical and experimental data shows that the numerical model here proposed the flow with high accuracy. Moreover, the effect of the obstacle’s dimensions on the water height was examined. The extension to different contraction geometries of the simulation channel was examined. •NSWEs with a dispersive treatment can simulate accurately Dam break phenomena.•The modified staggered finite volume method with wet–dry procedure successfully solves the NSWE.•The location of the obstacle or the channel contraction has no effect on the downstream water level.•The downstream water level may be lowered by modifying the height of an obstacle placed in the path of the flow.