Kim, Y.; Seo, M.; Lee, C.; Hwang, T., and Lee, W.-D., 2023. Numerical simulation of tsunami generation and propagation due to viscous debris flow impact using LS-DYNA. In: Lee, J.L.; Lee, H.; Min, B.I.; Chang, J.-I.; Cho, G.T.; Yoon, J.-S., and Lee, J. (eds.), Multidisciplinary Approaches to Coastal and Marine Management. Journal of Coastal Research, Special Issue No. 116, pp. 141-145. Charlotte (North Carolina), ISSN 0749-0208.

Numerous studies have been conducted on landslide tsunamis considering the material that is displaced as being granular or a rigid body with a uniform shape. However, actual landslides occur because the effective stress reduces due to the increased underground water level from rainfall. Moreover, the viscous debris flow strongly exhibits the dynamic properties of a fluid than a rigid body. Therefore, in the current work, the validity and effectiveness of the LS-DYNA analysis were verified by comparing its results with that of existing experiments on tsunami generation that occurred from the collapse of granular material and its collision with the water surface. In addition, a two-phase flow analysis was conducted in LS-DYNA to simulate the generation and propagation of a tsunami that occurs due to the viscous debris flow. Consequently, the maximum water level of the tsunami generated by debris flow was found to increase with the potential energy of the soil pile. Additionally, the tsunami at the beginning of the generation had significant nonlinearity; as it propagated, the waveform distribution became more stable. It became similar to the theoretical solitary wave as the wave height decreased.