Experimental and Numerical Study of Steel Lazy Wave Riser Response in Extreme Environment

The paper presents numerical simulations and analysis of experimental results obtained from a model scale test on steel lazy wave riser conducted by the DeepStar® consortium. The study focuses on the hydrodynamic response of a steel lazy wave riser under forced oscillatory and random motions in a wave basin. The riser pipe deformations were measured by Fiber Bragg Grating (FBG) strain sensors, as well as force transducers. Both in-plane and out-of-plane signals were recorded. Numerical simulations were performed, focusing on in-plane riser response, and compared with the experiments. The typical hydrodynamic coefficients (added mass, and drag) for the riser design are used in analysis and the calculated riser reponses are compared with measurements. In addition, some coefficients are adjusted to improve the comparison and the results are promising. The test data post-processing approach and modeling of steel lazy wave riser are also discussed in the paper.