Depth-averaged vs. Full 3-D SPH Models: A Comparison of Accuracy and Computational Speed for Simulating Dam Break Flash Flood

E3S Web of Conferences(2023)

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Abstract
Dam-break flow is a three-dimensional (3-D) phenomenon that is often numerically modeled using depth-averaged formulation, omitting the 3-D effect for computational efficiency. This study compares the performance and accuracy of depth-averaged and 3-D models, particularly using Smoothed Particles Hydrodynamics (SPH) method. Both models accurately predict flow evolution, with the 3-D model capturing detailed 3-D effects. However, the depth-averaged model shows significantly shorter computation time (by 20 times) and memory usage due to fewer particles used. However, it shows slower computational effort per particle due to the time-consuming Newton-Raphson iterative procedure. This study provides insights into the performance and accuracy of two commonly used models in simulating violent fluid dynamics, aiding model selection for specific applications.
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Key words
dam,depth-averaged
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