Seaway Loads Applied to a Frigate by the Smoothed Particle Hydrodynamics Technique

摘要

Reduction of maintenance and life-cycle management costs of ships and offshore structures remains a major concern for both naval and commercial operators. Accordingly, the development and utilisation of improved loads and degradation modelling and structural assessment tools are required. This includes the incorporation of non-linearities due to the fluid-structure interaction (FSI), because non-linear loads can considerably contribute to the long-term stresses and structural damage. Smoothed Particle Hydrodynamics (SPH), a mesh-free particle method, can provide a cost-effective and robust solution to determining the nonlinear responses of ships in long crested waves. This paper presents a summary of developments within the Structural Integrity of Maritime Platforms (SloMP) project. The paper describes the implementation of SPH, coupling between SPH and Finite Element (FE) analysis, and the extraction of loads and stresses from a model of a naval ship. A key aspect of the analysis is the exploitation of a technique to develop regular waves at constant amplitude over many wavelengths. Test cases are used to study the model sensitivity to various numerical parameters, and the results computed using the SPH-FE method are compared to those computed using a strip theory method. Based on the results of the sensitivity analysis appropriate domain boundaries (depth and width), and SPH particle diameter are recommended.