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Parametric excitation of moored wave energy converters using viscous and non-viscous CFD simulations
Chalmers University of Technology, Sweden.
Chalmers University of Technology, Sweden.
RISE - Research Institutes of Sweden, Safety and Transport, Safety. Aalborg University, Denmark.ORCID iD: 0000-0001-6934-634x
2019 (English)In: Advances in Renewable Energies Offshore / [ed] C. Guedes Soares, Taylor & Francis Group, 2019, p. 455-462Conference paper, Published paper (Refereed)
Abstract [en]

The paper discusses the use of CFD simulations to analyse the parametric excitation of moored, full scale wave energy converters in six degrees of freedom. We present results of VOF- RANS and VOF-Euler simulations in Open FOAM® for two body shapes: (i) a truncated cylinder; and (ii) a cylinder with a smooth hemispherical bottom. Flow characteristics show large differences in smoothness of flow between the hull shapes, where the smoother shape results in a larger heave response. However the increased amplitude makes it unstable and parametric pitch excitation occurs with amplitudes up to 30°. The responses in surge, heave and pitch (including the transition to parametric motion) are found to be insensitive to the viscous effects. This is notable as the converters are working in resonance. The effect of viscous damping was visible in the roll motion, where the RANS simulations showed a smaller roll. However, the roll motion was found to be triggered not by wave-body interaction with the incident wave, but by reflections from the side walls. This highlights the importance of controlling the reflections in numerical wave tanks for simulations with WEC motion in six degrees of freedom.

Place, publisher, year, edition, pages
Taylor & Francis Group, 2019. p. 455-462
National Category
Marine Engineering
Identifiers
URN: urn:nbn:se:ri:diva-35957Scopus ID: 2-s2.0-85056432802ISBN: 978-1-138-58535-5 (print)OAI: oai:DiVA.org:ri-35957DiVA, id: diva2:1261132
Conference
3rd International Conference on Renewable Energies Offshore
Funder
Swedish Energy Agency, P40428-1Available from: 2018-11-06 Created: 2018-11-06 Last updated: 2019-08-08Bibliographically approved

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Eskilsson, Claes

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
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  • Other locale
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Output format
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