Numerical Research on Impacting Load and Structural Response for a Model Experiment of High-Speed Craft

Abstract

High-speed craft typically utilizes hydroplane boat-type and large power engine to obtain high-speed in water. However, these designs result in significant hydrodynamic nonlinearities, including slamming, wetness, sliding, and dolphin effect. As a result, high-speed craft exhibits complex impact load characteristics and structural responses, which have garnered considerable attention from ship mechanics researchers. This paper studies impacting load and structural response of a high-speed craft by means of numerical approach that combines computational fluid dynamics (CFD) and finite element method (FEM). A model experiment of high-speed craft is selected to simulate impact load and structural response. The craft model consists of two ship bodies and a keel beam, and a number of pressure sensors and strain gaugesare arranged to capture the impacting pressure and vertical bending moment (VBM). A numerical fluid-structure interaction (FSI) approach is employed to investigate the model experiment of the high-speed craft by coupling CFD and FEM. CFD is utilized to solve the hydrodynamics of the high-speed craft. Dynamics of fluid-body interaction (DFBI) and overset grid algorithm are employed to accurately simulate the motion of the craft. Dynamic FEM is used to calculate structural response of high-speed craft, structural VBM is obtained. Two-way FSI is employed to realize coupling of CFD and FEM. This involves iterating the wave pressures and structural displacement to make progress. Ultimately, the numerical results and experimental results, which encompass impacting pressure, craft motion, and VBM, are compared and analyzed, demonstrating a high degree of agreement. Numerical methods can be employed to analyze the impacting load and structural response for high-speed craft.