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Innovative Ice Protection for Shallow Water Drilling: Part III — Finite Element Modelling of Ice Rubble Accumulation

[+] Author Affiliations
Arne Gürtner

NTNU; StatoilHydro, Trondheim, Norway

Ibrahim Konuk

NTNU, Trondheim, Norway; Natural Resources Canada, Canada

Ove Tobias Gudmestad

NTNU, Trondheim; StatoilHydro, Stavanger, Norway

Pavel Liferov

StatoilHydro, Trondheim, Norway

Paper No. OMAE2008-57915, pp. 981-987; 7 pages
doi:10.1115/OMAE2008-57915
From:
  • ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering
  • Volume 3: Pipeline and Riser Technology; Ocean Space Utilization
  • Estoril, Portugal, June 15–20, 2008
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-4820-3 | eISBN: 0-7918-3821-8
  • Copyright © 2008 by ASME

abstract

The concept of the Shoulder Ice Barrier (SIB) has previously been presented in a companion paper under the same title at OMAE 2006 (Gürtner et al., 2006), whereas ice model tests of the SIB are presented in an accompanying paper at this year’s OMAE (Gürtner and Gudmestad, 2008). The present paper investigates a computational model for simulating ice-SIB interactions. This involves the simulation of rubble accumulations and accordingly the exerted ice forces. The computational model is developed within the framework of finite elements. Characteristic fracture of ice is handled by introducing the Cohesive Zone Approach (CZA), wherein cohesive elements are placed in-between the finite element grid of the ice. Fracture may thereby occur along element boundaries with due regard to fracture properties such as traction and separation. Fracture and plastic deformation of the ice are hence co-existing, though competing, mechanisms, while accounting for the dynamics of the ice mass. We compare the computational results with the ones obtained during the model testing.

Copyright © 2008 by ASME

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