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이슬기(S.G. Lee),이승수(S. Lee),이주용(J.Y. Lee),엄정아(J.A. Um),이원호(W.H. Yi) 한국전산유체공학회 2020 한국전산유체공학회지 Vol.25 No.4
This paper presents the computational analysis of debris flow using multi-phase modeling and resulting impact force on the structure. The mixture of soil and water was modeled as slurry phase for various water content controlled by volume concentration of each material. Unsteady flow was solved for incompressible fluid in 3D domain and volume of fluid (VOF) method was introduced to trace the boundary between the slurry and the ambient air. Due to the shear thinning characteristics of slurry, nonlinear viscosity model was implemented. In order to verify the present method, the numerical computations were carried out for the experimental setup with the sloped channel employed in a previous study. As expected and shown in the previous experimental study, the greater impact force on the measuring plate was obtained for the larger angle of slope. In addition, the maximum impact force occurred much faster for the slurry with the higher water content. The comparison between the experimental results and the present computation shows a good agreement. It was also found that the critical water content at which the debris starts to flow was 35% at an inclination of 50° and 40% to 40°. As the result, it is expected that present method can be used to calculate the impact force of the debris flows on the structures, and can further be used for damage prediction and reduction.
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