## Abstract

A three-dimensional method for predicting the motions of a ship running in waves is presented. Basically the method developed here is based on the source distribution technique and the general formulations include the effect of steady flow and unsteady flow. Three algorithms are used for treating the corresponding Green functions and derivatives, i.e. (1) The Hess & Smith algorithm for the part of simple source l/r. (2) The complex plane contour integral of Shen & Farell algorithm for the Double integral of steady flow. (3) The series expansions of Telste & Noblesse algorithm for the Cauchy principal value integral of unsteady flow. The steady flow potential is especially considered in the calculations of diffraction and radiation problems, and the effects on ship motions are discussed. The results indicate that the effect of steady flow is generally small, but it still cannot be neglected in some cases especially for long waves. It is also interesting to find that the steady flow effect depends on the fore-aft configuration of the ship.

Original language | English |
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Pages | 621-628 |

Number of pages | 8 |

Publication status | Published - 1999 Jan 1 |

Event | Proceedings of the 1999 9th International Offshore and Polar Engineering Conference (ISOPE-99) - Brest Duration: 1999 May 30 → 1999 Jun 4 |

### Conference

Conference | Proceedings of the 1999 9th International Offshore and Polar Engineering Conference (ISOPE-99) |
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City | Brest |

Period | 99-05-30 → 99-06-04 |

## All Science Journal Classification (ASJC) codes

- Energy Engineering and Power Technology
- Ocean Engineering
- Mechanical Engineering