Engineering Mechanics Institute Conference 2013

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Development of 3-dimensional elastic model for fluid-structure interaction analysis using particle method

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Sung-Chul Hwang
Dept. of Naval Architecture & Ocean Engineering, Pusan National University
Korea, Republic Of

Jong-Chun Park
Dept. of Naval Architecture & Ocean Engineering, Pusan National University
Korea, Republic Of

Chang-Yong Song
Dept. of Ocean Engineering, Mokpo National University
Korea, Republic Of

Recently, some fluid-structure interaction (FSI) problems on the fluid impact loads interacting with structures, such as sloshing slamming and green-water etc., have been issued especially in ocean engineering fields. The numerical procedures to solve FSI problems were classified two approaches: the monolithic approach and the partitioned approach. The fluid and structure dynamics are treated in single system equation on monolithic approach. But the partitioned approach treats them as separated numerical algorithm and computational fields. And the most of numerical analysis about FSI has performed partitioned approach by using grid system. The structure analysis and the fluid analysis could be treated the problems including a large deformation respectively. But, grid based method could not be solved together that problems easily. For this method, each solver needs algorithms for regenerating grid or special boundary condition. In case of the fluid analysis, these special treats could not guarantee about conservation in mass and momentum. On the other hand, particle method could be satisfied conservation law perfectly about the problems including large deformation. Also particle method has disadvantage such like non-physical pressure fluctuations and long calculating time. Lately, high performance computing was becoming more common and limit of computing was overcome. And various methods for decreased non-physical pressure oscillations proposed. The PNU-MPS(Pusan National University Modified MPS) was successfully decreased non-physical pressure oscillation for original MPS(Moving Particle Simulation) method .In this study, an elastic model based on a particle method, MPS method, was developed for simulating the FSI problems. At first, the developed model was applied to a simple cantilever deflection problem for verification. Then the model was coupled with a fluid flow model, PNU-MPS method1, and applied to the numerical investigation of coupling effects between a cantilever and a mass of water, which has various densities, free-falling to the end of cantilever such like Figure 1.


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