Proceedings 7th International SPHERIC Workshop pages:71-77
International SPHERIC Workshop edition:7 location:Prato, Italia date:29 - 31 May 2012
We discuss the application of a dynamic refinement procedure to reduce the computational requirements of an elastic-plastic model to simulate non-cohesive soil. In the refinement procedure, the diagonal components of the strain tensor are used as the criterion for the refinement, and an SPH particle is refined by replacing it with new daughter particles which are located according to a square pattern centered at the refined particle position. The position of the daughter particles and their smoothing distance are determined such that the error introduced due to the refinement is kept small. Further, possible numerical instabilities are identified and avoided by using adequate refinement parameters. Obtained results are compared with those of simulations using a fine discretization in the whole domain. The comparison shows a good agreement, while the savings in computational time and memory consumption are considerable.