Abstract
Landslide-induced tsunami is a complex fluid–solid coupling process that plays a crucial role in the study of a disaster chain. To simulate the coupling behaviors between the fluid and solid, a graphics processing unit-based coupled smoothed particle hydrodynamics (SPH)-discrete element method (DEM) code is developed. A series of numerical tests, which are based on the laboratory test by Koshizuka et al. (Particle method for calculating splashing of incompressible viscous fluid, 1995) and Kleefsman et al. (J Comput Phys 206:363–393, 2005), are carried out to study the influence of the parameters, and to verify the accuracy of the developed SPH code. To ensure accurate results of the SPH simulation, the values for the diffusion term, particle resolution (1/25 characteristic length), and smoothing length (1.2 times of particle interval) are suggested. The ratio of the SPH particle size and the DEM particle’s diameter influences the accuracy of the coupling simulation between solid particles and water. For the coupling simulation of a single particle or a loose particle assembly (not contact each other) with fluid, this ratio should be smaller than 1/20; for a dense particle assembly, a ratio of smaller than 1/6 will be good.
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Acknowledgements
The authors would like to acknowledge the project of “Natural Science Foundation of China, China (51879142, 52079067)” and “Research Fund Program of the State Key Laboratory of Hydroscience and Engineering (2020-KY-04).”
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Zhou, Q., Xu, WJ. & Dong, XY. SPH-DEM coupling method based on GPU and its application to the landslide tsunami. Part I: method and validation. Acta Geotech. 17, 2101–2119 (2022). https://doi.org/10.1007/s11440-021-01388-2
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DOI: https://doi.org/10.1007/s11440-021-01388-2