  This paper develops a consistent particle method for capturing the highly
non-linear behavior of violent free-surface flows, based on an Enhanced Weakly
Compressible Moving Particle Semi-implicit (EWC-MPS) method. It pays special
attention to the evaluation and improvement of two particle regularization
techniques, namely, pairwise particle collision (PC) and particle shifting
(PS). To improve the effectiveness of PC in removing noisy pressure field, and
volume conservation issue of PS, we propose and evaluate several enhancements
to these techniques, including a novel dynamic PC technique, and a consistent
PS algorithm with new boundary treatments and additional terms (in the
continuity and momentum equations). Besides, we introduce modified higher-order
and anti-symmetric operators for the diffusive and shear force terms.
Evaluation of the proposed developments for violent free-surface flow benchmark
cases (2D dam-break, 3D water sloshing, and 3D dam-break with an obstacle)
confirms an accurate prediction of the flow evolution and rigid body impact, as
well as long-term stability of the simulations. The dynamic PC reduces pressure
noises with low energy dissipation, and the consistent PS conserves the volume
even for extreme deformations. Comparing the role of these new particle
regularization techniques demonstrates the effectiveness of both in assuring
the uniformity of the particle distribution and pressure fields; nevertheless,
the implementation of PS is found to be more complex and time-consuming, mainly
due to its need for free surface detection and boundary treatment with many
tuning parameters.
