Coupled modelling of a non-linear wave energy converter and hydraulic PTO

Caitlin Worden Hodge, Will Baterman, Zhiming Yuan, Philipp R. Thies, Tom Bruce

Research output: Contribution to conferencePaper

1 Citation (Scopus)

Abstract

The mechanical motion of a wave energy converter (WEC) is converted by the power take-off (PTO) system into electricity, but these two systems are not independent, as they have been treated in WEC modelling. Treating them as such leads to inaccuracies in prediction of power output and reliability, and can erode confidence in numerical modelling tools. This paper presents a methodology for the two-way coupling of high fidelity modelling of WEC hydrodynamics with a more accurate representation of the PTO and investigates the impact of using simplified PTO models. Simplified models represent the full PTO with a single parameter which is in itself difficult to choose and may require a number of iterations. These different methods were used to assess the behaviour of the CCell WEC in a regular wave, with the calculations for mean power varying considerably in different wave conditions and the range of motion consistently under predicted by the simpler models. The coupled model increased the computational requirement for the simulation, however it provided the developer a better understanding of the impact on and utilisation of different hydraulic components.

Conference

ConferenceTwenty-eighth (2018) International Ocean and Polar Engineering Conference
CountryJapan
CitySapporo
Period10/06/1815/06/18

Fingerprint

Takeoff
Hydraulics
Hydrodynamics
Electricity

Keywords

  • wave energy converter
  • optimisation
  • CFD
  • hydrodynamics
  • PTO modelling

Cite this

Hodge, C. W., Baterman, W., Yuan, Z., Thies, P. R., & Bruce, T. (2018). Coupled modelling of a non-linear wave energy converter and hydraulic PTO. 634-640. Paper presented at Twenty-eighth (2018) International Ocean and Polar Engineering Conference, Sapporo, Japan.
Hodge, Caitlin Worden ; Baterman, Will ; Yuan, Zhiming ; Thies, Philipp R. ; Bruce, Tom. / Coupled modelling of a non-linear wave energy converter and hydraulic PTO. Paper presented at Twenty-eighth (2018) International Ocean and Polar Engineering Conference, Sapporo, Japan.7 p.
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Hodge, CW, Baterman, W, Yuan, Z, Thies, PR & Bruce, T 2018, 'Coupled modelling of a non-linear wave energy converter and hydraulic PTO' Paper presented at Twenty-eighth (2018) International Ocean and Polar Engineering Conference, Sapporo, Japan, 10/06/18 - 15/06/18, pp. 634-640.

Coupled modelling of a non-linear wave energy converter and hydraulic PTO. / Hodge, Caitlin Worden; Baterman, Will; Yuan, Zhiming; Thies, Philipp R.; Bruce, Tom.

2018. 634-640 Paper presented at Twenty-eighth (2018) International Ocean and Polar Engineering Conference, Sapporo, Japan.

Research output: Contribution to conferencePaper

TY - CONF

T1 - Coupled modelling of a non-linear wave energy converter and hydraulic PTO

AU - Hodge, Caitlin Worden

AU - Baterman, Will

AU - Yuan, Zhiming

AU - Thies, Philipp R.

AU - Bruce, Tom

PY - 2018

Y1 - 2018

N2 - The mechanical motion of a wave energy converter (WEC) is converted by the power take-off (PTO) system into electricity, but these two systems are not independent, as they have been treated in WEC modelling. Treating them as such leads to inaccuracies in prediction of power output and reliability, and can erode confidence in numerical modelling tools. This paper presents a methodology for the two-way coupling of high fidelity modelling of WEC hydrodynamics with a more accurate representation of the PTO and investigates the impact of using simplified PTO models. Simplified models represent the full PTO with a single parameter which is in itself difficult to choose and may require a number of iterations. These different methods were used to assess the behaviour of the CCell WEC in a regular wave, with the calculations for mean power varying considerably in different wave conditions and the range of motion consistently under predicted by the simpler models. The coupled model increased the computational requirement for the simulation, however it provided the developer a better understanding of the impact on and utilisation of different hydraulic components.

AB - The mechanical motion of a wave energy converter (WEC) is converted by the power take-off (PTO) system into electricity, but these two systems are not independent, as they have been treated in WEC modelling. Treating them as such leads to inaccuracies in prediction of power output and reliability, and can erode confidence in numerical modelling tools. This paper presents a methodology for the two-way coupling of high fidelity modelling of WEC hydrodynamics with a more accurate representation of the PTO and investigates the impact of using simplified PTO models. Simplified models represent the full PTO with a single parameter which is in itself difficult to choose and may require a number of iterations. These different methods were used to assess the behaviour of the CCell WEC in a regular wave, with the calculations for mean power varying considerably in different wave conditions and the range of motion consistently under predicted by the simpler models. The coupled model increased the computational requirement for the simulation, however it provided the developer a better understanding of the impact on and utilisation of different hydraulic components.

KW - wave energy converter

KW - optimisation

KW - CFD

KW - hydrodynamics

KW - PTO modelling

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M3 - Paper

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Hodge CW, Baterman W, Yuan Z, Thies PR, Bruce T. Coupled modelling of a non-linear wave energy converter and hydraulic PTO. 2018. Paper presented at Twenty-eighth (2018) International Ocean and Polar Engineering Conference, Sapporo, Japan.