Experimental analysis of cylindrical wave fields

Cameron McNatt, Vengatesan Venugopal, David Forehand, Gregory Payne

Research output: Contribution to conferencePaper

Abstract

In a previous theoretical paper submitted to EWTEC, the authors showed that the wave energy converter (WEC) wave field can be accurately and analytically represented by cylindrical linear waves with the appropriate coefficients. In that paper, the coefficients were found computationally using the boundary-element method software, WAMIT. For the present paper, experiments were conducted in the newly refurbished University of Edinburgh Curved Wave Tank to determine the same cylindrical coefficients for progressive waves. The experiments employed two body geometries, an attenuator consisting of a horizontal pitching cylinder, and a terminator made up of a bottom-hinged flap. An array of 59 wave gauges was arranged in a circle-spoke pattern, where the circle of wave gauges was necessary for deriving the cylindrical coefficients, and the spokes, which extended radially further afield, were used for validation. Both the scattered and the radiated waves of the bodies were examined at three frequencies. High-order harmonics were present in a number of the wave fields, and tank reflections were problematic. Despite this, the linear analytical wave field, whose coefficients were found experimentally, agrees well with the experimentally measured linear wave field at points other than those used to derive the coefficients. The results serve to validate linear wave theory as it relates to the wave field and reinforce the concept that these waves can be used to compute WEC performance and wave farm interactions and impacts.
Original languageEnglish
Publication statusPublished - 6 Sep 2015
Event11th European Wave and Tidal Energy Conference (EWTEC2015) - Cité des Congrès de Nantes, Nantes, France
Duration: 6 Sep 201511 Sep 2015

Conference

Conference11th European Wave and Tidal Energy Conference (EWTEC2015)
CountryFrance
CityNantes
Period6/09/1511/09/15

Fingerprint

Gages
Boundary element method
Farms
Experiments
Geometry

Keywords

  • wave energy converters
  • WECs
  • wave fields
  • linear wave theory

Cite this

McNatt, C., Venugopal, V., Forehand, D., & Payne, G. (2015). Experimental analysis of cylindrical wave fields. Paper presented at 11th European Wave and Tidal Energy Conference (EWTEC2015), Nantes, France.
McNatt, Cameron ; Venugopal, Vengatesan ; Forehand, David ; Payne, Gregory. / Experimental analysis of cylindrical wave fields. Paper presented at 11th European Wave and Tidal Energy Conference (EWTEC2015), Nantes, France.
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abstract = "In a previous theoretical paper submitted to EWTEC, the authors showed that the wave energy converter (WEC) wave field can be accurately and analytically represented by cylindrical linear waves with the appropriate coefficients. In that paper, the coefficients were found computationally using the boundary-element method software, WAMIT. For the present paper, experiments were conducted in the newly refurbished University of Edinburgh Curved Wave Tank to determine the same cylindrical coefficients for progressive waves. The experiments employed two body geometries, an attenuator consisting of a horizontal pitching cylinder, and a terminator made up of a bottom-hinged flap. An array of 59 wave gauges was arranged in a circle-spoke pattern, where the circle of wave gauges was necessary for deriving the cylindrical coefficients, and the spokes, which extended radially further afield, were used for validation. Both the scattered and the radiated waves of the bodies were examined at three frequencies. High-order harmonics were present in a number of the wave fields, and tank reflections were problematic. Despite this, the linear analytical wave field, whose coefficients were found experimentally, agrees well with the experimentally measured linear wave field at points other than those used to derive the coefficients. The results serve to validate linear wave theory as it relates to the wave field and reinforce the concept that these waves can be used to compute WEC performance and wave farm interactions and impacts.",
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McNatt, C, Venugopal, V, Forehand, D & Payne, G 2015, 'Experimental analysis of cylindrical wave fields' Paper presented at 11th European Wave and Tidal Energy Conference (EWTEC2015), Nantes, France, 6/09/15 - 11/09/15, .

Experimental analysis of cylindrical wave fields. / McNatt, Cameron; Venugopal, Vengatesan; Forehand, David; Payne, Gregory.

2015. Paper presented at 11th European Wave and Tidal Energy Conference (EWTEC2015), Nantes, France.

Research output: Contribution to conferencePaper

TY - CONF

T1 - Experimental analysis of cylindrical wave fields

AU - McNatt, Cameron

AU - Venugopal, Vengatesan

AU - Forehand, David

AU - Payne, Gregory

PY - 2015/9/6

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N2 - In a previous theoretical paper submitted to EWTEC, the authors showed that the wave energy converter (WEC) wave field can be accurately and analytically represented by cylindrical linear waves with the appropriate coefficients. In that paper, the coefficients were found computationally using the boundary-element method software, WAMIT. For the present paper, experiments were conducted in the newly refurbished University of Edinburgh Curved Wave Tank to determine the same cylindrical coefficients for progressive waves. The experiments employed two body geometries, an attenuator consisting of a horizontal pitching cylinder, and a terminator made up of a bottom-hinged flap. An array of 59 wave gauges was arranged in a circle-spoke pattern, where the circle of wave gauges was necessary for deriving the cylindrical coefficients, and the spokes, which extended radially further afield, were used for validation. Both the scattered and the radiated waves of the bodies were examined at three frequencies. High-order harmonics were present in a number of the wave fields, and tank reflections were problematic. Despite this, the linear analytical wave field, whose coefficients were found experimentally, agrees well with the experimentally measured linear wave field at points other than those used to derive the coefficients. The results serve to validate linear wave theory as it relates to the wave field and reinforce the concept that these waves can be used to compute WEC performance and wave farm interactions and impacts.

AB - In a previous theoretical paper submitted to EWTEC, the authors showed that the wave energy converter (WEC) wave field can be accurately and analytically represented by cylindrical linear waves with the appropriate coefficients. In that paper, the coefficients were found computationally using the boundary-element method software, WAMIT. For the present paper, experiments were conducted in the newly refurbished University of Edinburgh Curved Wave Tank to determine the same cylindrical coefficients for progressive waves. The experiments employed two body geometries, an attenuator consisting of a horizontal pitching cylinder, and a terminator made up of a bottom-hinged flap. An array of 59 wave gauges was arranged in a circle-spoke pattern, where the circle of wave gauges was necessary for deriving the cylindrical coefficients, and the spokes, which extended radially further afield, were used for validation. Both the scattered and the radiated waves of the bodies were examined at three frequencies. High-order harmonics were present in a number of the wave fields, and tank reflections were problematic. Despite this, the linear analytical wave field, whose coefficients were found experimentally, agrees well with the experimentally measured linear wave field at points other than those used to derive the coefficients. The results serve to validate linear wave theory as it relates to the wave field and reinforce the concept that these waves can be used to compute WEC performance and wave farm interactions and impacts.

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M3 - Paper

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McNatt C, Venugopal V, Forehand D, Payne G. Experimental analysis of cylindrical wave fields. 2015. Paper presented at 11th European Wave and Tidal Energy Conference (EWTEC2015), Nantes, France.