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A Fundamental Study on Collision of a Tsunami Drifting Objects Against Structures Using MPS Method and FEM

[+] Author Affiliations
Koichi Masuda, Tomoki Ikoma, Daichi Murata, Hiroaki Eto, Akihiro Matsuoka

Nihon University, Funabashi, Japan

Yasuhiro Aida

National Institute of Maritime, Port and Airport Technology, Yokosuka, Japan

Masaharu Ikegami

PorTech Co., Ltd., Tokyo, Japan

Paper No. OMAE2018-77874, pp. V006T05A027; 6 pages
doi:10.1115/OMAE2018-77874
From:
  • ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 6: Ocean Space Utilization
  • Madrid, Spain, June 17–22, 2018
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-5125-8
  • Copyright © 2018 by ASME

abstract

The large-scale tsunami generated by the Great East Japan Earthquake on March 11, 2011 caused a great deal of damage. In addition to tsunami hydrodynamic forces, loads generated by drifting objects such as ships and cars can cause destruction in coastal areas. As such, impact forces due to collisions of drifting objects are an important consideration in the design and planning of structures in coastal areas.

Depending on the size of the drifting object, it is difficult to evaluate the effect of the impact force at the time of collision through tank experiments. Therefore, it is necessary to develop a numerical simulation method that can reasonably evaluate such effects. Such a method must consider the nonlinear interactions among drifting objects, a fluid, and fixed structures.

In the present study, we used the moving particle semi-implicit (MPS) and finite element methods to calculate the effect of collisions between drifting objects and structures, and then verified the results experimentally. The MPS method was applied to calculate the loads and pressures due to the collisions. These results were then used to simulate the deformation of the structure using the finite element method. A tank experiment was then conducted in order to confirm the accuracy of the numerical calculations. The deformation of a rod-shaped steel structure was measured following collision with a floating acrylic plate. The experimental results confirmed the accuracy of the numerical calculations.

Copyright © 2018 by ASME

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