Wajac - wave loads on slender structures - computes hydrostatic and hydrodynamic forces on fixed offshore frame structures due to wave and current, together with static or gust wind loads.
Analysing environmental effects
Wajac is used by designers to compute the environmental design loads on fixed offshore structures like jackets and jack-up’s. Typical analyses are:
- Design (100 year) wave analysis
- Deterministic fatigue wave analysis
- Stochastic (spectral) fatigue analysis
- Eigen value analysis
- Static analysis
The design loads are often combinations of wind, waves and current – Wajac computes them all.
Wajac uses the Morison equation for computing the hydrodynamic loads on tubular members. Hydrodynamic loads are also computed for other cross sections by use of equivalent diameters.
The frame model used by Wajac is created by Sesam modellers like GeniE or Patran-Pre. The environmental loads are computed by Wajac (executed from inside GeniE or from Sesam Manager) and they are read by one of the Sesam strength programs, Sestra or Usfos, for subsequent structural analysis.
Benefits
- Calculated distributed member loads may be displayed in GeniE for easy verification and help in understanding where the peak loads are
- Automatic transfer of loads to structural analysis or statistical post-processing
- Wajac will find the position of waves giving max. base shear and overturning moment, creating the corresponding loadcases automatically
- Integrated analysis when used inside GeniE (i.e. modelling, wave load calculation, strength analysis, and post-processing within same graphical user interface)
- Transfer of loads to Sestra for linear strength analysis, or Usfos for pushover analysis