### Abstract

In a previous study of the problem, the hullform yielding the minimal wavemaking resistance at a given speed and water depth was calculated, subject to constraints on the displacement, the maximal local beam, and the interior space required, and the requirement that the profile of the hull was to be rectangular.

The work presented here extends this effort in a number of practically-relevant directions. The total resistance of the vessel is minimised either for a single speed and water depth, or over a range of speed/depth conditions. The length of any waterline, and the draft oat any station are allowed to vary within a prescribed range, thus allowing non-rectangular profiles and, hence, further generalising the approach. A constraint on the maximal waterline slope is introduced in order to restrict flow separation. Minimisation is carried out using a hybrid of classical 'hill-climbing' techniques and a Genetic Algorithm.

Language | English |
---|---|

Pages | 194-210 |

Number of pages | 17 |

Journal | Transactions of the Royal Institution of Naval Architects |

Volume | 138 |

Publication status | Published - 1996 |

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### Keywords

- high speed craft
- hullforms
- resistance
- wavemaking
- river banks

### Cite this

*Transactions of the Royal Institution of Naval Architects*,

*138*, 194-210.

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*Transactions of the Royal Institution of Naval Architects*, vol. 138, pp. 194-210.

**Minimal-resistance hullforms for high-speed craft.** / Day, Alexander; Doctors, Lawrence.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Minimal-resistance hullforms for high-speed craft

AU - Day, Alexander

AU - Doctors, Lawrence

PY - 1996

Y1 - 1996

N2 - There is a continuing interest in the improvement of the design of vessels in order to minimise the power required to propel them. When operating in rivers, an additional concern is the environmental impact of the wave generation, in which case there is a desire to reduce the erosion of the river banks as much as possible. In a previous study of the problem, the hullform yielding the minimal wavemaking resistance at a given speed and water depth was calculated, subject to constraints on the displacement, the maximal local beam, and the interior space required, and the requirement that the profile of the hull was to be rectangular.The work presented here extends this effort in a number of practically-relevant directions. The total resistance of the vessel is minimised either for a single speed and water depth, or over a range of speed/depth conditions. The length of any waterline, and the draft oat any station are allowed to vary within a prescribed range, thus allowing non-rectangular profiles and, hence, further generalising the approach. A constraint on the maximal waterline slope is introduced in order to restrict flow separation. Minimisation is carried out using a hybrid of classical 'hill-climbing' techniques and a Genetic Algorithm.

AB - There is a continuing interest in the improvement of the design of vessels in order to minimise the power required to propel them. When operating in rivers, an additional concern is the environmental impact of the wave generation, in which case there is a desire to reduce the erosion of the river banks as much as possible. In a previous study of the problem, the hullform yielding the minimal wavemaking resistance at a given speed and water depth was calculated, subject to constraints on the displacement, the maximal local beam, and the interior space required, and the requirement that the profile of the hull was to be rectangular.The work presented here extends this effort in a number of practically-relevant directions. The total resistance of the vessel is minimised either for a single speed and water depth, or over a range of speed/depth conditions. The length of any waterline, and the draft oat any station are allowed to vary within a prescribed range, thus allowing non-rectangular profiles and, hence, further generalising the approach. A constraint on the maximal waterline slope is introduced in order to restrict flow separation. Minimisation is carried out using a hybrid of classical 'hill-climbing' techniques and a Genetic Algorithm.

KW - high speed craft

KW - hullforms

KW - resistance

KW - wavemaking

KW - river banks

M3 - Article

VL - 138

SP - 194

EP - 210

JO - Transactions of the Royal Institution of Naval Architects

T2 - Transactions of the Royal Institution of Naval Architects

JF - Transactions of the Royal Institution of Naval Architects

SN - 0035-8967

ER -