Simulation of dam-break flow in channel expansion with coupled 2-D/3-D SPH model

Elvira Džebo in Dušan Žagar in Matjaž Četina in Gregor Petkovšek (2012) Simulation of dam-break flow in channel expansion with coupled 2-D/3-D SPH model. V: 7th International SPHERIC Workshop, 29-30 May 2012, Prato, Italy.

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Povzetek

The paper presents the simulation of a dam-break flow in a channel expansion with a coupled 2-D/3-D SPH mathematical model Tis Isat. The model was calibrated and validated against the experiments of Martin and Moyce [1]. Overall agreement between the Tis Isat model and other available models was good while local behaviour at the solid boundaries was better [2]. The noveltyof the presented approach is in the application of a coupled 2-D/3-D SPH model. The proposed method is applicable to systems where the flow transits from 2-D to 3-D state. The proposed approach significantly shortens the computational time of the SPH simulations, while the precision of results is still satisfactory. A laboratory experiment of the wave after instantaneouscollapse of a dam [3] was used for calibration. The downstream channel slope was 0.087% and the channel width expanded instantaneously from 0.4 m to 1.2 m. The results of the coupled 2- D/3-D mathematical model Tis Isat were compared to measurements on this physical model, results of a 1-D finite difference model and results of the fully 3-D mathematical model Tis Isat. The overall agreement of the results was at least as good as achieved with other models.

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