A COMPARISON BETWEEN SMOOTHED PARTICLE HYDRODYNAMICS (SPH) AND MOVING PARTICLE SEMI-IMPLICIT (MPS) METHODS FOR DAM-BREAKING EVENT

Resumo

Lagrangian particle-based methods have opened new perspectives for the investigation of
complex problems with large free-surface deformation. Some well-known particle-based methods
adopted to solve non-linear hydrodynamics problems are the smoothed particle hydrodynamics (SPH)
and moving particle semi-implicit (MPS). Both methods modeled the continuum by a system of
Lagrangian particles (points) but adopting distinct approaches for the numerical operators, pressure
calculation, and boundary conditions. Despite the ability of the particle-based methods in modeling
highly nonlinear hydrodynamics, some shortcomings, such as unstable pressure computation and high

computational cost still remains. In order to assess the performance of these two methods, the weakly-
compressible SPH parallel solver, DualSPHysics, and an in-house incompressible MPS solver are

adopted in this work. Two test cases consisting of 3D dam-breaking problems are simulated and wave
heights, pressures and forces are compared with available experimental data. The influence of the
artificial viscosity on the accuracy of SPH is investigated. Computational times of both solvers are
also compared. Finally, the relative benefits of the methods for solving free-surface problems are
discussed, therefore providing directions of their applicability.