Vortex-induced vibration is one of the significant inducing factors of fatigue damage in steel catenary risers(SCRs),thus vortex-induced vibration analysis holds crucial importance in the design of SCRs.OrcaFlex,with its robust functionality and widespread application in marine engineering,offers two fatigue damage prediction methods for vortex-induced vibration,namely the frequency domain prediction method based on modal superposition and the time domain prediction method based on the Iwan-Blevins wake oscillator model.The time domain prediction model of OrcaFlex for vortex-induced vibration only considers fatigue damage caused by transverse vortex-induced vibration.An interface for the development of a two-degree-of-freedom wake oscillator model for vortex-induced vibration is established based on OrcaFlex's time domain prediction method,considering the influence of floating platform motion on the excitation of SCRs due to vortex-induced vibration.This facilitates the prediction of fatigue damage in SCRs due to two-degree-of-freedom vortex-induced vibration.
steel catenary riser(SCR)fatigue damagetime domain predictionvortex-induced vibration(VIV)OrcaFlexwake oscillator model
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