Journal of Marine Science and Technology

, Volume 13, Issue 2, pp 85–94

Numerical simulation of wave-induced nonlinear motions of a two-dimensional floating body by the moving particle semi-implicit method


    • Research Institute for Applied MechanicsKyushu University
  • Masashi Kashiwagi
    • Research Institute for Applied MechanicsKyushu University
  • Shigeru Naito
    • Osaka University
Original Article

DOI: 10.1007/s00773-007-0260-y

Cite this article as:
Sueyoshi, M., Kashiwagi, M. & Naito, S. J Mar Sci Technol (2008) 13: 85. doi:10.1007/s00773-007-0260-y


The moving particle semi-implicit (MPS) method was applied to compute nonlinear motions of a floating body influenced by the water on deck. To compute the motions of a rigid body, the fluid pressure at the position of each particle on the body surface was directly integrated in space and the equations of translational and rotational motions were integrated in time to determine the correct position of the rigid-body surface at each time step of the time-domain calculation. The performance of this method was validated through a comparison with measured results in an experiment that was newly conducted using a model of a box-shaped floating body with a small freeboard. Although the overall agreement was good, some discrepancies were observed for a shorter wave period, especially for the drift motion in sway. The effect of numerical resolution on the results was checked by changing the number of particles. With a higher number of particles, no obvious improvement was seen in the global body motions, but the resolution of the local free-surface profile, including the water on deck, was improved.

Key words

MPS methodParticle methodNonlinear motionsWater on deckFree surfaceHydrodynamic forcesDrift motion

Copyright information

© The Japan Society of Naval Architects and Ocean Engineers (JASNAOE) 2008