AQWA 

              

Manufacturer: Century Dynamics

Website: www.century-dynamics.com

 

Data Input:

  • Wave spectrum  
  • Wind spectrum
  • Vessel properties
  • Properties of mooring lines (linear and non-linear composite, clump-weights and buoys, polynomial description of steel-wire cables up to 5th order, pulleys and winch-lines and constant-force cables) 
  • Fenders (directional, fixed-directional and floating and friction and damping)
  • DP properties

Applications:

 

AQWA is a computer program consisting of a set of modules, which all have a different application. They all work together under “AQWA Graphical Supervisor”. The table above gives a short overview of the area covered by each module.

There are two more modules not mentioned in the figure above:

  • AQWA-Tether: coupled TLP-Tendon analysis including stress and fatigue and towed tethers.

  • AQWA-Solar: motions and load-time-histories using high-order Morison-equations.

  • AQWA-Float and AQWA-Launch: Modelling of launching and floating of jacket structures

  • AQWA-Offshore: designing and analysing floating structures such as FPSO’s, Spars, Semi-Submersibles, TLP’s and Truss-Spars.
Licensing:

Contact Century Dynamics for licensing

Documentation and support:
  • Clear and easy to reference manuals.

  • Hotline telephone, fax and e-mail support by experienced engineers.

  • Ongoing research and development for future program releases.
Computer systems:
  • PC (IBM compatible).

  • Runs under Windows NT 4.0/Windows 2000 Professional/Windows XP Professional
Postprocessor output:
  • Computer animations of vessel motions and hydrodynamic interaction between floating bodies

  • Bending moment and shear force calculation including forward speed

  • Splitting force calculation

  • Output in Excel

  • Automatic generation of a mesh from offsets

  • Output of full QTF matrix including second-order terms for diffraction and radiation

  • Possibility to incorporate FEMGV, a finite element model generator.
Solution:
  • Transformations (time-history to frequency domain and vice versa, time history filter and analysis, integral transformations, statistical analysis, algebraic functions and combinations)

  • Function processing of wave spectrum: (cross swell) spectral density, spectral wavelets, surface-time history, -elevation and -pressure

  • Time history of wave-elevation and wind velocity

  • Near Field and Far Field solutions for second order drift forces

  • Drag forces for small structures can be calculated as Morison elements; diffracting and Morison elements can be put in one model

  • Stokes second order wave theory

  • Green’s functions for diffraction and radiation analysis

 

Modelling:
  • Frequency-domain analysis of linear and second-order motions and loads in irregular waves.

  • Non-linear time-domain analysis for survival waves for a set of connected floating bodies.

  • Second-order Morison

Loading:
  • Wind load of any spectrum (OCIN, APIR or user defined)

  • Wave-load of any spectrum and from diffraction and radiation (regular and irregular, defined by JONSWAP, Pierson-Moskowitz or user defined)

  • Drift forces

  • Thruster loads

  • Shallow water effects

  • Current loads of any spectrum

  • Full hydrodynamic interaction between bodies

  • Non-linear hydrodynamic effects