Buoys 3D Buoys 6D Buoys Draw parallel with data for clump attachments Irrotational example Degrees of freedom included Type (lumped / spar / towed fish) Lumped properties (arbitrary geometry) Distributed properties (axisymmetric geometry) Slam loads Wings, applied loads, buoys as attachments (torsion) Attaching buoys to buoys: composite objects and negligible lumped buoy properties 7. The Environment Sea properties Reynolds number (viscosity, temperature and formulations) Density (constant and spatially varying) Seabed Types of seabed (flat, profile, 3D), origin and direction Interpolation methods Contact stiffness and damping Non linear hysteretic model with trenching, suction and re penetration ARYATECH MARINE & OFFSHORE SERVICES PVT LTD 5 Current Interpolated data (profile, reference speed and direction) Power law data Use of variable data Multiple current data sets Ramping current in build up Vary horizontally Wind Wind type options (constant, spectral and time history) Which objects affected Waves Regular and random (different wave types) Wave height, period and direction (spread waves) Wave preview (for random waves) Multiple wave trains 6. Links, Winches and Shapes Links Connection data (to lines and other objects) Linear spring (no compression) Non linear spring/damper (supports compression) Link connecting lines & link results Winches Connection data (to lines and other objects) Winch control (length or tension, by stage or whole simulation) Pull in to a specific point & winch results Elastic solids / trapped water / drawing applications Connections, geometry, contact stiffness, friction Example using line interacting with elastic solid (catenary over cylinder) Nodal interaction and locking 5. Worked Example Line Setup Wizard All objects data form (polar / Cartesian coordinates) Lay azimuth (as laid direction) Grouping objects (create, duplicate, move & locate) Library facilities 4. Discrete buoyancy using clumps) BSR modelling (using bend stiffener attachment) and TSJ modelling (using line type) 3.
Orcaflex Tutorial Full Statics Adds
Statics, the General Data Form and Dynamics Statics overview: lines only and lines connected to other free objects Statics of lines only Step 1: (quick, catenary, prescribed, spline, user specified) Step 2 : full statics adds all relevant loads Statics of lines connected to other free objects Separate buoy and line (SBL) or whole system statics (WSS) Degrees of freedom included (buoy and vessels) Use calculated positions Convergence parameters (tolerance and minimum / maximum damping) Two lines & 6D buoy example (also showing rotational indeterminacy) The General Data Form Comment field, units Stages, ramping, sample interval (peak logging) Starting velocity Overview of Selecting Integration Method: Iterative vs. Statics, primary and secondary motion Imposed motions (prescribed, harmonic, time history, displacement RAOs) Calculated motions (3DOF, 6DOF, included effects) Vessel types Structure and conventions (symmetry) RAOs (displacement / load) RAO checks: graphs and replay in long wave Hydrodynamic data import Drawing (wire frame / shaded / origin for draught) 8.
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