Input |
Description |

Ancillary Type: |
This drop-down list allows you to select the required modelling complexity. The options are Simplified (the default) and Complex. If Ancillary Type is Simplified, only Weight in Air and Weight in Water are enabled, and the remaining inputs are disabled. In this case, the Ancillary component is modelled as a point mass and a point buoy, which may be sufficient to model a pullhead for example. When the Complex option is selected, the component is modelled as a beam element, characterised by the physical dimensions, stiffnesses and hydrodynamic coefficients you input. This may be more appropriate when modelling a flange or collar for example. |

Properties: |
Click on this button to display the Ancillary Properties – Simplified or Ancillary Properties – Complex dialog. See the ‘Ancillary Properties – Simplified Dialog’ or ‘Ancillary Properties – Complex Dialog’ sections for detailed descriptions of these dialogs. |

Input |
Description |

Weight in Air: |
The weight in air of the ancillary component. Units: [kN] or [kips] |

Weight in Water: |
The weight in water of the ancillary component. Note that the weight in water must be specified less than the weight in air. Units: [kN] or [kips] |

Input |
Description |

Length: |
The length of the ancillary component. Units: [m] or [ft] |

Overall OD: |
The outer diameter of the ancillary component. Units: [mm] or [in] |

Inner Diameter: |
The inner diameter of the ancillary component. This defaults to zero. Units: [mm] or [in] |

Bending Stiffness: |
The bending stiffness of the ancillary component. Units: [kNm2] or [kips.ft2] |

Axial Stiffness: |
The axial stiffness of the ancillary component. Units: [kN] or [kips] |

Torsional Stiffness |
The torsional stiffness of the ancillary component. Units: [kNm2/rad] or [kips.ft2/rad] |

Drag Diameter: |
The effective diameter for hydrodynamic force calculations for the component. This input is optional, and may be either a number or “OD”, signifying the component outer diameter. The input defaults to “OD”. Units: [mm] or [in] |

Normal Drag: |
The Morison’s Eq. drag coefficient for the direction normal to the component, denoted . |

Normal Inertia: |
The Morison’s Eq. inertia coefficient for the direction normal to the component, denoted . |