### 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 and Smith algorithm for the part of simple source l/r. (2) The complex plane contour integral of Shen and Farell algorithm for the Double integral of steady flow. (3) The series expansions of Telste and 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 effects on ship motions are discussed. The results indicate that the effect of steady flow is generally small, but 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 |
---|---|

Title of host publication | Proceedings of the 1999 Ninth International Offshore and Polar Engineering Conference (Volume 3), Brest, France, 30 May - 4 June 1999 |

Editors | J S Chung, M Olagnon, C H Kim, A Francescutto, J S Chung, M Olagnon, C H Kim, A Francescutto |

Publisher | International Society of Offshore and Polar Engineers |

Pages | 621-628 |

Number of pages | 8 |

ISBN (Print) | 1880653427 |

Publication status | Published - 1999 |

Event | Proceedings of the 1999 Ninth International Offshore and Polar Engineering Conference - Brest, France Duration: 1999 May 30 → 1999 Jun 4 |

### Other

Other | Proceedings of the 1999 Ninth International Offshore and Polar Engineering Conference |
---|---|

Country | France |

City | Brest |

Period | 99-05-30 → 99-06-04 |

### Fingerprint

### All Science Journal Classification (ASJC) codes

- Earth and Planetary Sciences(all)
- Engineering(all)
- Environmental Science(all)

### Cite this

*Proceedings of the 1999 Ninth International Offshore and Polar Engineering Conference (Volume 3), Brest, France, 30 May - 4 June 1999*(pp. 621-628). International Society of Offshore and Polar Engineers.

}

*Proceedings of the 1999 Ninth International Offshore and Polar Engineering Conference (Volume 3), Brest, France, 30 May - 4 June 1999.*International Society of Offshore and Polar Engineers, pp. 621-628, Proceedings of the 1999 Ninth International Offshore and Polar Engineering Conference, Brest, France, 99-05-30.

**The effect of steady flow potential on the ship motions in waves.** / Fang, Ming-Chung; Liao, P. Y.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

TY - GEN

T1 - The effect of steady flow potential on the ship motions in waves

AU - Fang, Ming-Chung

AU - Liao, P. Y.

PY - 1999

Y1 - 1999

N2 - 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 and Smith algorithm for the part of simple source l/r. (2) The complex plane contour integral of Shen and Farell algorithm for the Double integral of steady flow. (3) The series expansions of Telste and 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 effects on ship motions are discussed. The results indicate that the effect of steady flow is generally small, but 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.

AB - 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 and Smith algorithm for the part of simple source l/r. (2) The complex plane contour integral of Shen and Farell algorithm for the Double integral of steady flow. (3) The series expansions of Telste and 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 effects on ship motions are discussed. The results indicate that the effect of steady flow is generally small, but 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.

UR - http://www.scopus.com/inward/record.url?scp=0033392191&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0033392191&partnerID=8YFLogxK

M3 - Conference contribution

SN - 1880653427

SP - 621

EP - 628

BT - Proceedings of the 1999 Ninth International Offshore and Polar Engineering Conference (Volume 3), Brest, France, 30 May - 4 June 1999

A2 - Chung, J S

A2 - Olagnon, M

A2 - Kim, C H

A2 - Francescutto, A

A2 - Chung, J S

A2 - Olagnon, M

A2 - Kim, C H

A2 - Francescutto, A

PB - International Society of Offshore and Polar Engineers

ER -