A direct coupling method for 3D hydroelastic analysis of floating structures

Abstract

SUMMARYThis paper presents a complete formulation for three-dimensional hydrodynamic analysis of floating flexible structures subjected to surface regular waves, as well as other excitation forces, by employing a direct tight coupling method. The continuum mechanics-based finite element method is employed to model floating structures with arbitrary geometries, which can account for the geometric nonlinearities and initial stress effects that result from the hydrostatic analysis, whereas the boundary element method is used for the fluid via total potential formulation. The simplicity and generality of the present formulation are revealed as compared with the conventional formulation. Numerical examples demonstrate the general capability of the formulation proposed.

Hydroelastic analysis of floating structures with liquid tanks and comparison with experimental tests

“…The solution procedure is consequently simpler than that of the conventional method [4,7,13,14,17], which requires radiation and diffraction analysis procedures to obtain the interaction coefficients. Recently, this method was generalized for a 3D linear hydroelastic analysis of floating structures by Kim et al [1]. Since the 3D formulation is obtained by consistently linearizing nonlinear solid mechanics equations, all the interaction terms including hydrostatic stiffness are included [1,27,28].…”

“…Recently, this method was generalized for a 3D linear hydroelastic analysis of floating structures by Kim et al [1]. Since the 3D formulation is obtained by consistently linearizing nonlinear solid mechanics equations, all the interaction terms including hydrostatic stiffness are included [1,27,28].…”

“…[1,29,30] for a hydroelastic analysis of floating structures with liquid tanks. The structural formulation is based on the updated Lagrangian approach, which is consistently applied to hydrostatic and steady state hydrodynamic analyses.…”

“…Of course, all the interaction terms among structural motions, sloshing and water waves are completely included in the formulation. In particular, the initial stress is correctly considered in the geometric stiffness [1,27]. In the fluid formulation, we use the extended boundary integral equations to remove the well-known irregular frequency effect [31][32][33].…”

Wave interaction with Floating platform of different shapes and supports using BEM approach

“…Hence, use of Meshless method is an important aspect.Futher, Oblique surface gravity wave scattering by a floating flexible porous plate is investigated in water of finite and infinite depths under the assumption of small amplitude water wave theory and structural response were captured by Koley et al (2017). By employing direct strong coupling method, Kim et al (2013) formulated a complete formulation for 3-D hydrodynamic analysis of floating structures subjected to surface regular waves, as well as other excitation forces. The interaction of oblique monochromatic incident waves with submerged horizontal porous plate was carried out by Cho and Kim (2013), it has been investigated by considering the 2-D linear potential theory.…”