Results |
 
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Results |
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The University of Maine report presents a variety of results, many of which are reproduced using the Flexcom model.
•Static Surge-Sway Offsets examines fairlead and anchor tension values resulting from static offsets of the system in the surge-sway plane.
•Free Decay Tests examines natural response frequencies of the system in each of the 6 degrees of freedom.
•Wave-induced motion RAOs examines the system response to wave excitation only, producing displacement RAOs as a function of wave frequency (aerodynamic loading is not considered).
•Design Load Cases assesses the performance of the reference semisub in normal and extreme design conditions which are representative of the U.S. East Coast.
▪Design load cases are analysed in Flexcom using simulations of 10-minute (600 second) duration. For each seastate, a screening test is performed in advance of the main simulation, from which the peak wave occurring over a 3-hour storm is identified and noted. This ensures that the largest wave for each wind condition is experienced by the system. Further information on this aspect is presented in Wave Peak Times.
Some additional test cases are supplied with the Flexcom model, to allow users gain a better understanding of the turbine, and how to simulate it using Flexcom,
•Turbine Performance Test considers the turbine and supporting tower only, without the floating platform and mooring system, and examines fundamental turbine performance characteristics as a function of wind speed, such as rotor thrust, rotor speed, generator torque, blade pitch and generator power. This section also serves to validate Flexcom's numerical models - both rigid and flexible blades - via comparisons with OpenFAST.
•Yaw Alignment Demo, again with just the turbine and tower, demonstrates how to apply wind from different directions and how to align the turbine to face the oncoming wind.
•Subsea Power Cable demonstrates how to model a dynamic cable, and illustrates a methodology for estimating fatigue damage accumulation in the subsea power cable over time.