Multi-resolution ISPH-SPH for accurate and efficient simulation of hydroelastic fluid-structure interactions in ocean engineering

Abstract A SPH (Smoothed Particle Hydrodynamics)-based multi-resolution fully Lagrangian meshfree hydroelastic FSI (Fluid-Structure Interaction) solver is developed for accurate and adaptive reproductions of ocean engineering problems. The presented hydroelastic FSI solver comprises of projection-based ISPH (Incompressible SPH) fluid model and SPH structure model, through consideration of continuity/Navier-Stokes equations for fluid phase as well as linear/angular momentum conservation equations for structure phase. The FSI solver includes a consistent fluid-structure coupling scheme along with a novel multi-resolution scheme incorporating a common influence length, a modified SPH density definition and a SPH-based formulated SPP (Space Potential Particle) scheme in order to achieve consistent particle-based discretizations, precise satisfaction of fluid-structure interface boundary conditions and accurate volume conservation at the interface. The present ISPH fluid model corresponds to a refined version of ISPH incorporating several previously developed refined schemes, and hence the proposed FSI solver is referred to as “Enhanced Multi-resolution ISPH-SPH”. Validations are performed qualitatively/quantitatively through reproductions of classical as well as ocean engineering benchmark tests. Comparisons are also made with an MPS-based FSI solver as well as an Explicit ISPH-based one. A preliminary extension of the proposed solver to three-dimensions is also presented.