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Facilitating Large-Amplitude Motions of WaveEnergy Converters in OpenFOAM by a Modified Mesh Morphing Approach
Sigma Energy and Marine AB, Sweden.
RISE Research Institutes of Sweden, Safety and Transport, Safety Research. Aalborg University, Denmark.ORCID iD: 0000-0001-6934-634x
2021 (English)In: Proceedings of the 14th European Wave and Tidal Energy Conference 5-9th Sept 2021, Plymouth, UK, 2021, p. 2107-1-2107-8Conference paper, Published paper (Refereed)
Abstract [en]

High-fidelity simulations using computational fluid dynamics (CFD) for wave-body interaction are becoming increasingly common and important for wave energy converter (WEC) design. The open source finite volume toolbox OpenFOAM® is one of the most frequently used platforms for wave energy. There are currently two ways to account for moving bodies in OpenFOAM: (i) mesh morphing, where mesh deforms around the body; and (ii) an overset mesh method where a separate body mesh moves on top of a background mesh. Mesh morphing is computationally efficient but may introduce highly deformed cells for combinations of large translational and rotational motion. The overset method allows for arbitrarily large body motions (in certain conditions) and retains the quality of the mesh. However, it comes with a substantial increase in computational cost and possible loss of energy conservation due to the interpolation. In this paper we present a straightforward extension of the spherical linear interpolation (SLERP) based mesh morphing algorithm that increase the stability range of the method. The mesh deformation is allowed to be interpolated independently for different modes of motion, which facilitates tailored mesh motion simulations. The paper details the implementation of the method and evaluates its performance with computational examples of a cylinder with a moonpool. The examples show that the modified mesh morphing approach handles large motions well and provides a cost effective alternative to overset mesh for survival conditions.

Place, publisher, year, edition, pages
2021. p. 2107-1-2107-8
Keywords [en]
wave energy converter, CFD, wave-body interaction, survival, extreme waves, OpenFOAM.
National Category
Marine Engineering
Identifiers
URN: urn:nbn:se:ri:diva-56726OAI: oai:DiVA.org:ri-56726DiVA, id: diva2:1598883
Conference
14th European Wave and Tidal Energy Conference 5-9th Sept 2021, Plymouth, UK
Note

This work was supported by the Swedish Energy Agency under project  numbers 40428-1 and 47264-1.

Available from: 2021-09-29 Created: 2021-09-29 Last updated: 2023-05-16Bibliographically approved

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Eskilsson, Claes

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