Numerical Modelling of Hydroelastic FSI Using DualSPHysics: Recent Developments and Future Directions
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Anthropogenic transformation of the marine environment is growing at an unprecedented pace, generating design challenges of increasing complexity that call for improvements on traditional modeling strategies. A significant portion of such applications will be characterized by a hydroelastic behavior, its proper description being the key factor for an effective design – e.g., fluid–structure interaction (FSI) involving flexible vegetation in nature-based coastal defense systems. Numerical representation of physical phenomena as such requires strongly coupled models with appropriate approaches. Particle methods, given their meshless formulation, are ideally suited for modelling the highly deforming interfacial dynamics exhibited by compliant structures at sea for heterogeneous operational scenarios. In this contribution, we survey the numerical strategies implemented in the DualSPHysics solver to deal with hydroelastic FSI. DualSPHysics is based on the Smoothed Particles Hydrodynamics (SPH), and boasts valuable couplings and functionalities, also being highly parallelized for GPUs [1]. At the time of writing, the hydroelastic modeling strategies implemented to represent flexible structures are: • a dynamic structural solver of 3D bonded rigid bodies, based on a Lumped Parameter Method (LPM) [2]; • a non-linear Finite Element Analysis solver (FEM), based on the Euler–Bernoulli beam model [3]; and • a unified, SPH-based Total Lagrangian formulation for continuum mechanics [4]. This work will provide a detailed investigation into the performance of each model, balancing accuracy and computational load. Two groups of benchmarks will be used, coping with violent impacts of dam break-like flows and harsh wave loads, respectively, informing best practices for end-users for a wide spectrum of possible simulation variety. Due to its modeling capabilities and versatile problem-dependent characterization, DualSPHysics stands as an extremely competitive solution within the panorama of SPH- and particle-based codes for complex FSI, decisively positioned as effective design tool for real-life applications. [1] Domínguez, J. M., et al. doi:10.1007/s40571-021-00404-2 [2] Capasso, S. et al. doi:10.1007/s40571-021-004519. [3] Martínez-Estévez, I. et al. doi:10.1016/j.cma.2023.115989. [4] O'Connor J. & Rogers, B.D. doi:10.1016/j.jfluidstructs.2021.103312.