Numerical simulation of offshore wind turbine dynamics in drifting level ice
Additional Document Info
Copyright 2017 by the International Society of Offshore and Polar Engineers (ISOPE). According to the previous researchers, the bottom mounted offshore structure experienced ice-induced vibrations by the drifting level ice. In this study, a new ice breaking model based on the Matlock-method is proposed to explain the documented characteristics of ice-induced vibrations in many studies. A numerical simulation is performed by coupling the ice model with aero-hydro-servo-elastic numerical simulator, FAST. With this developed program, the monopile type wind turbine was examined in parked and operating conditions. The present results show that this model is capable of describing the three distinct ice crushing modes (intermittent ice crushing, frequency lock-in, and continuous brittle crushing), which are reported in both experimental tests and field data. In addition, it was found that the dynamics of tower and blades in two different conditions were dependent on the ice velocity.