MPS-FEM Coupled Method for Study of Wave-Structure Interaction

Abstract

Nowadays, an increasing number of ships and marine structures are manufactured and inevitably operated in rough sea. As a result, some phenomena related to the violent fluid-elastic structure interactions (e.g., hydrodynamic slamming on marine vessels, tsunami impact on onshore structures, and sloshing in liquid containers) have aroused huge challenges to ocean engineering fields. In this paper, the moving particle semi-implicit (MPS) method and finite element method (FEM) coupled method is proposed for use in numerical investigations of the interaction between a regular wave and a horizontal suspended structure. The fluid domain calculated by the MPS method is dispersed into fluid particles, and the structure domain solved by the FEM method is dispersed into beam elements. The generation of the 2D regular wave is firstly conducted, and convergence verification is performed to determine appropriate particle spacing for the simulation. Next, the regular wave interacting with a rigid structure is initially performed and verified through the comparison with the laboratory experiments. By verification, the MPS-FEM coupled method can be applied to fluid-structure interaction (FSI) problems with waves. On this basis, taking the flexibility of structure into consideration, the elastic dynamic response of the structure subjected to the wave slamming is investigated, including the evolutions of the free surface, the variation of the wave impact pressures, the velocity distribution, and the structural deformation response. By comparison with the rigid case, the effects of the structural flexibility on wave-elastic structure interaction can be obtained.

Numerical study of green water loads on a fixed structure with elastic sidewalls by MPS-FEM coupled method

“…In addition, the effects of elastic mode and nonlinearity on the numerical results are analyzed. Zhang et al [22] proposed a coupled MPS and FEM method for the numerical study of the interaction of regular waves with horizontally suspended structures. The fluid domain calculated by the MPS method was discretized into fluid particles and the structural domain solved by the FEM method was discretized into beam elements.…”

“…In this paper, a numerical simulation study would be carried out based on this approach. The loads and patterns of green water events on a fixed structure with rigid or flexible sidewalls were investigated using the solver MPSFSI-SJTU [22] based on the Moving Particle Semi-Implicit (MPS) method coupled with the Finite Element Method (FEM) in this paper. The rapid flow-structure interaction is generated by the wet dam-break method.…”

Simplified modeling for elastic analysis of a floating body in heave motion

“…Another approach makes use of the two types of the methods mentioned above by coupling them following some coupling strategies. Ma et al (2020) used SPH-FEM method to predict the hydroelastic behavior of floating thin elastic plate, and Zhang et al (2019) studied the interaction between a regular wave and a horizontal suspended structure using coupled MPS-FEM method. In the literature, fluid–elastic structure interaction problems are treated for small fluid fields that have applications for sloshing, water entry or dam failure.…”

Review of the State-of-Art of MPS Method in Ocean Engineering

“…For free surface flow, this method has been successfully applied to dam-break, wave breaking, sloshing in liquid tank, green water, water impact, and fluid-structure interaction problems. From the current applications, this method is proved to be effective in handling violent free-surface deformation flow [4][5][6][7][8][9].…”

“…With the development of naval architecture becomes larger and more offshore, the fluid-structure interaction problem (FSI) is receiving increasing attention and many further studies have been carried out. This problem usually involves non-linear phenomena, such as wave free surface overturning, breaking, splashing, fusion and complex kinematic response of the structure [4,7,9]. Until now, most of the numerical simulations for FSI were conducted using mesh-based methods.…”