Nonlinear SWATH ship motion in large longitudinal waves

Ming-Chung Fang, Shin Shiou Her

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


Recently the linear analyses for the SWATH ship motion have been well done in the frequency domain. In the present paper the technique to simulate the time history of motions for a SWATH ship running in large longitudinal waves is developed. The nonlinear effect treated here mainly arises from the large motion which is due to the large wave amplitude. Besides, the nonlinear viscous force is also included in the study. Because of large motion, the corresponding hydrodynamic coefficients vary with the instant draft, i.e: each time step, and must be carefully treated. The complexity of the speed effect on the hydrodynamic coefficients at each time step is also taken into consideration. To verify the validity of the present technique, the experiment is also carried out to compare with the theoretical results. Generally the results prove that the technique developed in the present study is successful for predicting the time history simulation of SWATH ship motions in large longitudinal waves. With the basis of the present study, the further analysis on the nonlinear phenomena, e.g. fin effect, of the SWATH ship in waves can be more extensively done.

Original languageEnglish
Pages (from-to)197-220
Number of pages24
JournalInternational Shipbuilding Progress
Issue number431
Publication statusPublished - 1995 Sept 1

All Science Journal Classification (ASJC) codes

  • Ocean Engineering
  • Mechanical Engineering


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