Instructions to participants

- Summary
- Overview of cases
- Detailed Overview of cases
- Case 1.1: KVLCC2 Deep water, forces & moments
- Case 1.2: KVLCC2 Deep water, trajectories
- Case 2.1: KVLCC2 shallow water, forces & moments
- Case 2.2: KVLCC2 shallow water, trajectories
- Case 3.1: KCS Deep water, forces & moments
- Case 3.2: KCS Deep water, trajectories
- Case 3.3: KCS Waves, trajectories
- Case 4.1: KCS shallow water, forces & moments
- Case 4.2: KCS shallow water, trajectories
- Case 5.1: ONRT, forces & moments
- Case 5.2: ONRT, trajectories
- Case 5.3: ONRT Waves, trajectories

Case 5.1: ONRT, forces & moments

- ONRT hull shape
- Fixed in surge, sway, roll and yaw. Upright condition (Ø=0). The experimental results are obtained free to trim and sink.
- Calm water
- Deep water. The results will be compared to experiments carried out at a water depth to draught ratio 31.25.
- L
_{WL}= 3.147 m (scale 48.9355) - V
_{model}=1.111 m/s, Fn = 0.20 (corresponding to full scale 15.1 knots) - Towing tank temperature during the tests:
Month Temperature [ºC] Density [kg/㎥] Kinetic Viscosity *10 ^{-6}[㎡/s]Test 5 17.4 998.72 1.0703 Static drift test 6 19.4 998.32 1.0183 Rudder test 7 21.3 997.94 0.9726 Pure sway test 8 23.5 997.4 0.9238 Pure yaw test 9 24.7 997.09 0.8987 Yaw with drift test - Propellers present. The propeller should work at the propeller point so that there is self-propulsion at V
_{model}=1.111 m/s, Fn = 0.2 (corresponding to full scale 15.1 knots). During the model tests, the propeller was working at 528rpm (= 8.8 rev/s). - Rudder s (spade type) present, but at zero rudder angle (exactly zero) for the pure drift and the drift/yaw tests.
- The attached fin stabilisers were passive and at zero offset angle during all captive tests.

- You can only submit case 5.1.2 when you delivered case 5.1.1
- You can only deliver case 5.1.2 package 2 when you deliver case 5.1.2 package 1.
- You can only deliver case 5.1.2 package 3 when you deliver case 5.1.2 package 2.
- You can only deliver case 5.1.2 package 4 when you deliver case 5.1.2 package 3.

- The N-moment (moment around the z-axis) should be supplied w.r.t. the midship.
- The K-moment (moment around the z-axis) should be supplied w.r.t. the waterline.
- Only the hydrodynamic forces are to be supplied: the inertial forces are not to be included.
- Forces and moments are to be given non-dimensional:

Package | Drift angle β=-atan(v/u) |
Non-dimensional rate of turn r’ | Requested quantities |
---|---|---|---|

Case 5.1.1 | 15° | 0 | X’, Y’, K’, N’ |

12° | 0 | X’, Y’, K’, N’ | |

9° | 0 | X’, Y’, K’, N’ | |

6° | 0 | X’, Y’, K’, N’ | |

3° | 0 | X’, Y’, K’, N’ | |

0° | 0 | X’, Y’, K’, N’ | |

-3° | 0 | X’, Y’, K’, N’ | |

-6° | 0 | X’, Y’, K’, N’ | |

-9° | 0 | X’, Y’, K’, N’ | |

-12° | 0 | X’, Y’, K’, N’ | |

-15° | 0 | X’, Y’, K’, N’ | |

Case 5.1.2, package 1 | 0° | 0 | X’, Y’, K’, N’ |

0° | 0.0762 | X’, Y’, K’, N’ | |

0° | 0.1712 | X’, Y’, K’, N’ | |

0° | 0.3106 | X’, Y’, K’, N’ | |

0° | 0.4834 | X’, Y’, K’, N’ | |

Case 5.1.2, package 2 | 4° | 0 | X’, Y’, K’, N’ |

4° | 0.0782 | X’, Y’, K’, N’ | |

4° | 0.1755 | X’, Y’, K’, N’ | |

4° | 0.3108 | X’, Y’, K’, N’ | |

4° | 0.4849 | X’, Y’, K’, N’ | |

Case 5.1.2, package 3 | 12° | 0 | X’, Y’, K’, N’ |

12° | 0.0760 | X’, Y’, K’, N’ | |

12° | 0.1713 | X’, Y’, K’, N’ | |

12° | 0.3017 | X’, Y’, K’, N’ | |

12° | 0.4772 | X’, Y’, K’, N’ |

Table below gives an example of the data that we would be getting for the ONRT for case 5.1.1 and 5.1.2. Submitters should generate an excel sheet in the format of the Table below. The submitter must type the calculated X’, Y’, K’ and N’.

The organisers will compare the submitted results to experimental data. Comparing the above submission (above table) to experimental data will give the below figure. It is the intention to have many submissions in the same type of figure to learn about the prediction capabilities for which combinations of r’ and β.

Values of submission “prediction method xx” for ONRT in deep water for yaw and drift (case 5.1.2)

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