A nonlinear dynamic corotational finite element model for submerged pipes

1st Conference of Computational Methods in Offshore Technology

计算机科学

De Vries, F.H.^1 ; Geijselaers, H.J.M.^1 ; Van Den Boogaard, A.H.^1 ; Huisman, A.^2

University of Twente, Faculty of Engineering Technology, P.O. Box 217, Enschede

7500 AE, Netherlands^1

Allseas Engineering B.V., Delft, Netherlands^2

关键词: Geometrically nonlinear;    Implicit time integration;    Morison's equation;    Newton Raphson iteration;    Pipe-laying vessel;    Response amplitude operator;    Static and dynamic forces;    Three dimensional finite element model;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/276/1/012030/pdf
DOI  :  10.1088/1757-899X/276/1/012030

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

A three dimensional finite element model is built to compute the motions of a pipe that is being laid on the seabed. This process is geometrically nonlinear, therefore co-rotational beam elements are used. The pipe is subject to static and dynamic forces. Static forces are due to gravity, current and buoyancy. The dynamic forces exerted by the water are incorporated using Morison's equation. The dynamic motions are computed using implicit time integration. For this the Hilber-Hughes-Taylor method is selected. The Newton-Raphson iteration scheme is used to solve the equations in every time step. During laying, the pipe is connected to the pipe laying vessel, which is subject to wave motion. Response amplitude operators are used to determine the motions of the ship and thus the motions of the top end of the pipe.