Pressure-corrected SPH with innovative particle regularization algorithms and non-uniform, initial particle distributions

This paper will present an enhanced SPH version, including some particle distribution algorithms, for which many of the well-known drawbacks of the standard SPH method are solved or, at least, relieved. Recent innovations in the SPH solver of VPS/PAM-CRASH are discussed in detail. Regularization algorithms to improve the particle distribution, both at the start of, and throughout, the simulation, highlight that such features help to ensure accurate interpolation of relevant fluid properties. A pressure correction method is also discussed. The combined effect of these improvements allows for the artificial viscosity to become small enough to represent the actual shear viscosity. With these modifications viscous drag effects for sinking of objects in water can now be simulated. Periodic boundaries are used to reduce the size of the computational domain and introduction of special damping zones allows to mitigate reflections of free surface waves at rigid boundaries. Application of these features to aircraft ditching will be discussed.