NDLI: The Adequacy of Phase-Averaged Models for Modelling Wave Farms

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Folley, Matt Whittaker, Trevor
Copyright Year	2011
Abstract	As the wave energy industry develops there is a need to develop tools for the estimation of the energy yield from wave farms, as well as determination of the environmental impact of wave farms and optimisation of wave farm layout. Tools based on spectral wave models are potentially suitable for these tasks and are already used extensively in coastal engineering to estimate wave climate and how waves affect the coastal environment. Examples of these tools include software packages such as SWAN, TOMAWAC and Mike21SW. However, a fundamental characteristic of spectral wave models is that they are phase-averaged models, which implies that the phase of individual wave components is unknown. Interactions between wave energy converters (WECs) in an array have been previously modelled using linear wave theory. These models have shown that phase can be important in determining the interaction between WECs in an array due to the effects of radiated waves. However, these models have typically assumed that the WECs have ideal control. The array interactions for more realistic control strategies are much weaker. In this paper arrays of realistically controlled WECs are modelled using hydrodynamic coefficients obtained from WAMIT, a linear hydrodynamic panel code, to determine the effects that radiated wave amplitude and WEC separation distance have on array interactions. It is shown that array interactions decrease with decreasing radiated wave amplitude and increasing separation distance. Array interactions are shown to change the power capture by less than 10% for typical WECs with realistic control. Moreover, it is shown that the change in power capture becomes highly sensitive to wave frequency and direction as the separation distance increases, although the magnitude of the interaction factor reduces. Finally, realistic wave spectra are applied to the array interactions of WECs. The average array interaction factor is found to be relatively insensitive to the mean wave period and direction. It is argued that this implies that phase-averaged models are adequate for modelling realistically controlled wave farms operating in realistic wave spectra. Consequently, provided a suitable phase-averaged model of a WEC can be developed, then it can be modelled with reasonable accuracy in spectral wave models.
Sponsorship	Ocean, Offshore and Arctic Engineering Division
Starting Page	663
Ending Page	671
Page Count	9
File Format	PDF
ISBN	9780791844373
DOI	10.1115/OMAE2011-49810
Volume Number	Volume 5: Ocean Space Utilization; Ocean Renewable Energy
Conference Proceedings	ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering
Language	English
Publisher Date	2011-06-19
Publisher Place	Rotterdam, The Netherlands
Access Restriction	Subscribed
Subject Keyword	Climate Wave energy Computer software Harbor and coastal engineering Linear wave theory Separation (technology) Modeling Waves Optimization Wave energy converters Shorelines Spectra (spectroscopy) Wave frequency Wave amplitude
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in