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High-fidelity modelling of moored marine structures: multi-component simulations and fluid-mooring coupling
RISE Research Institutes of Sweden, Safety and Transport, Electrification and Reliability. Aalborg University, Denmark.ORCID iD: 0000-0001-6934-634x
Sigma Energy & Marine AB, Sweden.
2022 (English)In: Journal of Ocean Engineering and Marine Energy, ISSN 2198-6444, E-ISSN 2198-6452, Vol. 8, no 4, p. 513-526Article in journal (Refereed) Published
Abstract [en]

High-fidelity viscous computational fluid dynamics (CFD) models coupled to dynamic mooring models is becoming an established tool for marine wave-body-mooring (WBM) interaction problems. The CFD and the mooring solvers most often communicate by exchanging positions and mooring forces at the mooring fairleads. Mooring components such as submerged buoys and clump weights are usually not resolved in the CFD model, but are treated as Morison-type bodies. This paper presents two recent developments in high-fidelity WBM modelling: (i) a one-way fluid-mooring coupling that samples the CFD fluid kinematics to approximate drag and inertia forces in the mooring model; and (ii) support for inter-moored multibody simulations that can resolve fluid dynamics on a mooring component level. The developments are made in the high-order discontinuous Galerkin mooring solver MoodyCore, and in the two-phase incompressible Navier–Stokes finite volume solver OpenFOAM. The fluid-mooring coupling is verified with experimental tests of a mooring cable in steady current. It is also used to model the response of the slack-moored DeepCwind FOWT exposed to regular waves. Minor effects of fluid-mooring coupling were noted, as expected since this a mild wave case. The inter-mooring development is demonstrated on a point-absorbing WEC moored with a hybrid mooring system, fully resolved in CFD-MoodyCore. The WEC (including a quasi-linear PTO) and the submerged buoys are resolved in CFD, while the mooring dynamics include inter-mooring effects and the one-way sampling of the flow. The combined wave-body-mooring model is judged to be very complete and to cover most of the relevant effects for marine WBM problems. © 2022, The Author(s).

Place, publisher, year, edition, pages
Springer Science and Business Media Deutschland GmbH , 2022. Vol. 8, no 4, p. 513-526
Keywords [en]
Cable dynamics, CFD, MoodyCore, Mooring systems, OpenFOAM, Submerged buoys, Arctic engineering, Buoyancy, Buoys, Drag, Galerkin methods, Mooring, Mooring cables, Navier Stokes equations, Cable dynamic, Computational fluid dynamics modeling, High-fidelity, High-fidelity modeling, Mooring system, Multicomponent fluid, Multicomponent simulation, Submerged buoy, Computational fluid dynamics
National Category
Marine Engineering
Identifiers
URN: urn:nbn:se:ri:diva-61202DOI: 10.1007/s40722-022-00263-wScopus ID: 2-s2.0-85139647369OAI: oai:DiVA.org:ri-61202DiVA, id: diva2:1716721
Note

Funding details: National Science Council, NSC; Funding details: Vetenskapsrådet, VR, 2018-05973; Funding details: Energimyndigheten, 50196-1; Funding text 1: This work was supported by the Swedish Energy Agency through Grant no 50196-1. Computational resources were provided by the Danish e-infrastructure Cooperation (DeiC) National HPC (g.a. DeiC-AAU-N5-202200002) and the Swedish National Infrastructure for Computing (SNIC) at NSC partially funded by the Swedish Research Council through Grant Agreement No. 2018-05973.

Available from: 2022-12-06 Created: 2022-12-06 Last updated: 2023-05-16Bibliographically approved

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