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Abstrakt
This paper summarises a series of studies in the early design phase of a wave energy device. The device consists of an outer body in the form of a buoy with a vertical tube, inside which an inner body can slide relative to the former. To understand the behaviour of the device, a linear mathematical model is first
developed in the frequency domain. Parametric studies show that a device with an enlarged tube cross section at the bottom has a better power performance relative to its size compared to a device with a uniform tube. Measurements of the device displacements, absorbed power and mean surge force obtained through scaled model tests in a wave tank are generally in good agreement with
predictions from the frequencydomain model, but some discrepancies are also observed. A notable discrepancy is the occurrence of a Mathieutype instability, where amplified pitch/roll motions with a period twice the wave period are triggered by heave motions. Once this happens, the relative motion between the two bodies and hence the absorbed power are found to be greatly reduced. A weakly nonlinear timedomain model is then developed and is able to predict, to some extent, this behaviour. It is demonstrated that numerical and experimental analyses going hand in hand are indispensable in the early design phase of a wave energy device.
developed in the frequency domain. Parametric studies show that a device with an enlarged tube cross section at the bottom has a better power performance relative to its size compared to a device with a uniform tube. Measurements of the device displacements, absorbed power and mean surge force obtained through scaled model tests in a wave tank are generally in good agreement with
predictions from the frequencydomain model, but some discrepancies are also observed. A notable discrepancy is the occurrence of a Mathieutype instability, where amplified pitch/roll motions with a period twice the wave period are triggered by heave motions. Once this happens, the relative motion between the two bodies and hence the absorbed power are found to be greatly reduced. A weakly nonlinear timedomain model is then developed and is able to predict, to some extent, this behaviour. It is demonstrated that numerical and experimental analyses going hand in hand are indispensable in the early design phase of a wave energy device.
Originalsprog  Engelsk 

Tidsskrift  Ships and Offshore Structures 
Vol/bind  14 
Udgave nummer  sup1 
Sider (fratil)  344356 
Antal sider  13 
ISSN  17445302 
DOI  
Status  Udgivet  3 okt. 2019 
Begivenhed  3rd International Conference on Ships and Offshore Structures  Chalmers University of Technology, Gothenburg, Sverige Varighed: 17 sep. 2018 → 19 sep. 2018 http://www.icsos.info/ 
Konference
Konference  3rd International Conference on Ships and Offshore Structures 

Lokation  Chalmers University of Technology 
Land/Område  Sverige 
By  Gothenburg 
Periode  17/09/2018 → 19/09/2018 
Internetadresse 
Emneord
 Wave Energy
 Numerical modelling
 Model testing
 Wave Tank Testing
 Point absorber WECs
Fingeraftryk
Dyk ned i forskningsemnerne om 'Numerical modelling and wave tank testing of a selfreacting twobody wave energy device'. Sammen danner de et unikt fingeraftryk.Projekter
 1 Afsluttet

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Projekter: Projekt › Forskning