Page 133 - Pipelines and Risers
P. 133
106 Chapter 7
surfaces will not match the faceted geometry of the rigid surface exactly, but the nodes of the
rigid elements defining the seabed will always lie on the this surface.
7.6 Validation of the Finite-Element Model
A 1300-meter long pipeline section between two consecutive rock-benns was analyzed, to
compare with the results of similar finite element models, Nystrom et al. (1997), Tornes et al.
(1997). Below, the results from the water filled situation is given for the first 100 meters only,
in order to get the details in the plots clear.
Ad&
--*alSrrshb AE4X-AdSrrshh AE4X -*alSrrsk lvlM -*alSrrsm
Irn Spa IMI
w
5403 IMO
Figure 7.9 ANSYS vs ABAQUS comparison - water filled situation.
From the results (Fig. 7.9) it can be seen that the two in-place models give close prediction of
axial stress, strain, bending moment, and configuration on the seabed (Ose et al. (1999)).
7.7 References
1. ANSYS Inc. (1998) "ANSYS, Ver. 5.5".
2. Cooker et al. (1991) "Concepts and Applications of Finite Element Methods".
