DNV’s Sesam software has been extended with a tailor-made solution for design of offshore wind turbine structures addressing the industry’s need to account for the combined effect of wind and hydrodynamic loads. The analysis functionality offered is in accordance with the DNV Offshore Standard DNV-OS-J101 Design of Offshore Wind Turbines.
Sesam Wind, building upon our 40+ years’ experience as a leading tool for engineering of offshore structures, is applicable for analyses of wind turbine structures for any depths, from shallow water mono piles to tripods, jacket structures as well as concrete gravity based structures for larger depths.
Sesam Wind offer an interface for easy import of time domain wind forces from commercial aero-elastic codes.
The imported wind forces may be combined with the hydrodynamic forces from waves and current generated in Sesam and merged to produce a single time series for ultimate strength and fatigue analysis of the substructure and foundation. Rain-flow counting methodology (RFC) from multiple time domain analysis, representing different short term environmental (sea and wind) states is offered computing the combined fatigue damage for all relevant wind and wave combinations.
Sesam also offers analysis capabilities for both eigenvalue analysis, frequency domain analysis and deterministic analysis for ultimate strength. Code checks supported includes API, Norsok, Eurocode, ISO and DS449. Modelling and simulations of the non-linear pile soil interaction for deterministic analysis as well as data for the linearized stiffness matrix to be used for time domain simulations can be performed as an integrated part of the analysis.
With Sesam GeniE as the core tools for modelling and analysis, users benefit from powerful modelling functionality and code checks with unique support for design iterations. Combination of beam and shell elements enables fast modelling of slender members and accurate modelling of complex transition pieces for detailed strength assessment.
Date: 14 October 2011