Software Tutorial,download,manual - http://www.caxsoft.net/

• 3D, nonlinear, large displacement analysis
• Fully coupled tension, bending & torsion
• Accurate, efficient and proven FE formulation
• Robust line compression / snatch modelling
• External line-on-line clash & sliding contact
• Internal line-in-line impact & sliding contact
• Modelling of post-contact behaviour
• Linear & nonlinear elastic contact stiffness
• Line slug flow and free-flooding effects
• Nonlinear time domain (implicit & explicit)
• Linear frequency domain (1st & 2nd order)
• Quasi-dynamic analysis
• Constraints to fix or impose individual DoFs
• Line feeding (haul in and pay out nodes)
• Fully coupled vessel – line analysis
• Comprehensive vessel load modelling
• Multi-body hydrodynamic coupling
• Full sum and full difference QTFs

• Vessel wave shielding (sea state RAOs)
• Water entry & exit slam loads
• Full description of wind, wave and current
• Flat, 2D or 3D seabed profile
• Linear elastic, non-linear hysteretic & P-y soil
• Binary and / or text input files
• Fatigue analysis
• Extreme value statistics
• Modal analysis
• VIV and interference analysis
• Pipelay and riser code checks
• Comprehensive range of automation tools
• Complete Matlab, Python & DLL interfaces
• Parallel processing (at no extra cost)
• Batch processing for volume analyses
• Distributed OrcaFlex optimises multi-licence use
• Full GUI with wire frame and shaded views

LINES

• Fully coupled bending, torsion and axial stiffness
• Bend Stiffener / Tapered Stress Joint model generation
• Pre-bend can be modelled (e.g. spool pieces) now with visualisation tool
• Centrifugal and Coriolis internal flow effects included
• Slug flow and free flooding options for line contents
• Multiple coatings and linings can be defined
• Equivalent pipe setup tool
• Bending stiffness, drag and added mass can be non-isotropic
• Axial, bending and torsional stiffness can be nonlinear
• 3D hysteresis model available for bending
• Rayleigh damping with or without geometric stiffness
• Line CofG may be displaced from geometric centre
• Clumped line attachments, drag chains or flex joints
• Non-isotropic Coulomb friction with seabed & elastic solids
• Line Clashing for external clash modelling between lines
• Line Contact for pipe-in-pipe, piggybacks, J-tube pulls, bend stiffeners, sliding connections, etc., allowing smooth modelling of large relative axial motion including friction
• Hydrodynamic, aerodynamic and user-defined applied loads
• Wake Interference (Huse, Blevins,user specified)
• Partially submerged lines (eg, floating hoses) handled robustly
• Line drag and lift coeffs can vary with Re or seabed proximity
• Added mass as a function of submergence or height above seabed
• Water entry / exit slam loads (per DNV H103, RP-C205)
• Compressibility specified by bulk modulus
• Choice of finite element or analytic catenary representation

VESSELS

• Imposed vessel displacements:
  • first order displacement RAOs
  • prescribed and / or harmonic motion
  • time history motion files
  • externally calculated
• Loads for calculated vessel motions:
  • first order load RAOs
  • applied loads (thrusters, ice, etc.)
  • 2nd order (low freq.) difference QTFs: full and Newman
  • 2nd order (high freq.) sum QTFs
  • wave drift damping
  • added mass and damping with convolution
  • 6DoF ‘other’ linear and quadratic damping
  • manoeuvring, current and wind loads
  • drag from attached Morison elements
  • loads from attached lines (coupled analysis)
• Multi-body hydrodynamic coupling between floaters
• Sea state RAOs (vessel wave shielding, wave jetting, etc)

BUOYS

• Full 3D and 6D modelling of buoys
• Lumped option with overall properties
• SPAR option for co-axial cylinders, each with own properties
• Fluid loads calculated based on the instantaneous wetted surface
• Added mass as a function of submergence
• Water entry / exit slam loads (per DNV H103, RP-C205)
• Wings for lifting surfaces
• User-defined imposed loads
• Compressibility specified by bulk modulus
• Coulomb friction with seabed and elastic solids

SHAPES

• Many features to model boundary surfaces and to control lines
• Shapes with friction for line & buoy contact
• Plane, cuboid, cylinder (solid/hollow), & bellmouth options
• Trapped water option for moonpool modelling
• Drawing option for visualisation purposes

WINCHES

• Winches with several length or tension control options

LINKS

• Links (springs) with linear or nonlinear stiffness & damping

CONSTRAINTS

• Allow individual degrees of freedom for other objects to be constrained
• Imposed motion via time history or externally calculated

TURBINES

• Dedicated horizontal-axis turbine object
• Aerodynamic loading via Blade Element Momentum (BEM) model
• Blades modelled with beam elements (similar to lines)
• Prandtl tip and hub loss models
• Pitt and Peters skewed wake model
• Blade pitch control via external function
• Generator control options (constant or externally calculated)
• Example Python controllers available (including Bladed type DLL wrapper)

SEA

• User-defined water density, kinematic viscosity, temperature
• User-defined horizontal and vertical density variation
• Temperature can be constant or vary with depth
• Kinematic viscosity can be constant or vary with temperature

SEABED

• Horizontal, sloping, 2D or 3D seabed surface (smooth or linear)
• Choice of soil models:
  • linear elastic
  • nonlinear hysteretic (trenching, suction & re-penetration)
  • P-y models (API RP 2A soft clay & sand & user-defined) for vertical and near-vertical line penetration
• Non-isotropic Coulomb friction in both statics & dynamics

WIND

• User-defined air density
• Wind velocity can be constant, or API or DNV spectra
• Wind can also be a time history file of speed and direction
• Vertical variation factor specified as a profile
• Full field wind (varies with both space & time)

WAVES

• Regular: Airy, Stokes’ 5th, Dean Stream Function, Cnoidal
• Irregular: ISSC, JONSWAP, Ochi-Hubble, Torsethaugen, Gaussian swell, user-defined, Time History
• Multiple wave trains for combination sea states
• Fluid stretching (Wheeler, kinematic or extrapolation)
• Irregular waves have directional wave spreading option
• Preview and selection of irregular wave profile
• Wave kinematics choice (with individual specification for 3D & 6D buoys and lines):
  • Exact (all nodes/buoys, every time step)
  • Grid interpolation at instantaneous object positions
  • Calculation at object static positions only
• Various wave spectrum discretisation methods:
• equal-energy (user-defined bounds & interval) – the default
• equal spacing (arithmetic progression)
• geometric progression

CURRENT

• 3D, non-linear
• Both magnitude and direction can be time varying
• Horizontal variation factor on magnitude