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Publications
Liu, DP., Ai, S.M., Sun, L.P. and Guedes Soares, C. (2023), ALE-ANCF modeling of J-lay lowering process coupled with dynamic positioning, Ocean Engineering, Vol. 269, 113552
A novel structural dynamics model for the pipeline J-lay lowering process is established based on the combination of the Absolute Nodal Coordinate Formula and Arbitrary-LagrangeEulerian description. The top constraint is introduced into the system equation in the form of generalized coordinates by using the material transport boundary to simulate the lowering process of the top end of the pipeline. A re-mesh scheme with defines a dynamic mesh region is adopted to control the element length and avoid numerical disturbance, and the accuracy of the material transport boundary and the re-mesh scheme is verified by a case of a pendulum with time-varying length. Then a coupled analysis program for J-lay deployment and the vessel with dynamic positioning is developed. The tensioner is modeled as a damper for adjusting the pay-out speed at the pipeline top end. An explanatory example about a 16-inch pipeline being laid to 1000 m water depth is introduced to carry out the numerical analysis. The obtained results show that a strong relevance exists between the lowering process and the dynamic characteristics of the touch-down zone.
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