Spectral Element FNPF Simulation of Focused Wave Groups Impacting a Fixed FPSO-type Body

摘要

A 3D fully nonlinear potential flow (FNPF) model based on an Eulerian formulation is presented. The model is discretized using high-order prismatic - possibly curvilinear - elements using a spectral element method (SEM) that has support for adaptive unstructured meshes. The paper presents details of the FNPF-SEM development, and a model is illustrated to exhibit exponential convergence for steep stream function waves to serve as validation. The model is then applied to the case of focused waves impacting on a surface-piercing, fixed FPSO-like structure. Good agreement is found between numerical and experimental wave elevations and pressures.