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Influence of bending stiffness on snap loads in marine cables: A study using a high-order discontinuous galerkin method
Chalmers University of Technology, Sweden.
RISE Research Institutes of Sweden, Safety and Transport, Safety Research. Aalborg University, Denmark.ORCID iD: 0000-0001-6934-634x
2020 (English)In: Journal of Marine Science and Engineering, E-ISSN 2077-1312, Vol. 8, no 10, article id 795Article in journal (Refereed) Published
Abstract [en]

Marine cables are primarily designed to support axial loads. The effect of bending stiffness on the cable response is therefore often neglected in numerical analysis. However, in low-tension applications such as umbilical modelling of ROVs or during slack events, the bending forces may affect the slack regime dynamics of the cable. In this paper, we present the implementation of bending stiffness as a rotation-free, nested local Discontinuous Galerkin (DG) method into an existing Lax–Friedrichs-type solver for cable dynamics based on an hp-adaptive DG method. Numerical verification shows exponential convergence of order P and P + 1 for odd and even polynomial orders, respectively. Validation of a swinging cable shows good comparison with experimental data, and the importance of bending stiffness is demonstrated. Snap load events in a deep water tether are compared with field-test data. The bending forces affect the low-tension response for shorter lengths of tether (200–500 m), which results in an increasing snap load magnitude for increasing bending stiffness. It is shown that the nested LDG method works well for computing bending effects in marine cables. © 2020 by the authors. 

Place, publisher, year, edition, pages
MDPI AG , 2020. Vol. 8, no 10, article id 795
Keywords [en]
Bending stiffness, Cable dynamics, Discontinuous Galerkin method, Low-tension cables, ROV tethers, Snap loads
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-51347DOI: 10.3390/jmse8100795Scopus ID: 2-s2.0-85093645214OAI: oai:DiVA.org:ri-51347DiVA, id: diva2:1516778
Note

Export Date: 7 January 2021; Article; Funding details: Energimyndigheten, P42246-1, P47264-1; Funding text 1: Funding: This research was funded by the Swedish Energy Agency under Grant Numbers P42246-1 and P47264-1.

Available from: 2021-01-12 Created: 2021-01-12 Last updated: 2023-05-16Bibliographically approved

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Eskilsson, Claes

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