Turbulence and wake effects in tidal stream turbine arrays

Martin Nuernberg, Longbin Tao

Research output: Contribution to conferencePaper

Abstract

Electricity generation from tidal current can provide a reliable and predictable alternative addition to a reduced carbon energy sector in the future. With increasing commercial development and deployment of the first multi-turbine array, significant cost reduction can be achieved by moving beyond demonstrator projects to large scale tidal turbine arrays. For the operational efficiency and safety, the interactions between multiple turbines installed in close proximity can affect the total electricity generation and thus require knowledge of the resulting flow field within and downstream of the array. This paper present results of an experimental and numerical study investigating the flow field characteristics in terms of velocity deficit and turbulence intensity in a staggered section of a tidal turbine array. Multiple configuration with varying longitudinal and transverse spacing between devices in a three-turbine array are tested. Comparison between numerical and experimental flow characteristics shows that open source numerical models with dynamic mesh features achieve good agreement and can be used for the investigation of array wake effects. The standard k – ω SST shows good agreement with experiments at reduced computational efficiency compared to higher order turbulence models (RSM). Further the importance of mixing with ambient flow is highlighted by identifying areas of significantly reduced velocity recovery within closely spaced tidal turbine arrays where ambient flow does not penetrate between adjacent wakes

Conference

Conference37th International Conference on Ocean, Offshore & Arctic Engineering
Abbreviated titleOMAE 2018
CountrySpain
CityMadrid
Period17/06/1822/06/18

Fingerprint

Turbulence
Turbines
Flow fields
Electricity
Cost reduction
Computational efficiency
Turbulence models
Numerical models
Recovery
Carbon
Experiments

Keywords

  • tidal turbine arrays
  • CFD
  • OpenFOAM
  • dynamic Mesh
  • experimental and numerical investigations

Cite this

Nuernberg, M., & Tao, L. (2018). Turbulence and wake effects in tidal stream turbine arrays. Paper presented at 37th International Conference on Ocean, Offshore & Arctic Engineering, Madrid, Spain. https://doi.org/10.1115/OMAE2018-77507
Nuernberg, Martin ; Tao, Longbin. / Turbulence and wake effects in tidal stream turbine arrays. Paper presented at 37th International Conference on Ocean, Offshore & Arctic Engineering, Madrid, Spain.
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Nuernberg, M & Tao, L 2018, 'Turbulence and wake effects in tidal stream turbine arrays' Paper presented at 37th International Conference on Ocean, Offshore & Arctic Engineering, Madrid, Spain, 17/06/18 - 22/06/18, . https://doi.org/10.1115/OMAE2018-77507

Turbulence and wake effects in tidal stream turbine arrays. / Nuernberg, Martin; Tao, Longbin.

2018. Paper presented at 37th International Conference on Ocean, Offshore & Arctic Engineering, Madrid, Spain.

Research output: Contribution to conferencePaper

TY - CONF

T1 - Turbulence and wake effects in tidal stream turbine arrays

AU - Nuernberg, Martin

AU - Tao, Longbin

PY - 2018/6/10

Y1 - 2018/6/10

N2 - Electricity generation from tidal current can provide a reliable and predictable alternative addition to a reduced carbon energy sector in the future. With increasing commercial development and deployment of the first multi-turbine array, significant cost reduction can be achieved by moving beyond demonstrator projects to large scale tidal turbine arrays. For the operational efficiency and safety, the interactions between multiple turbines installed in close proximity can affect the total electricity generation and thus require knowledge of the resulting flow field within and downstream of the array. This paper present results of an experimental and numerical study investigating the flow field characteristics in terms of velocity deficit and turbulence intensity in a staggered section of a tidal turbine array. Multiple configuration with varying longitudinal and transverse spacing between devices in a three-turbine array are tested. Comparison between numerical and experimental flow characteristics shows that open source numerical models with dynamic mesh features achieve good agreement and can be used for the investigation of array wake effects. The standard k – ω SST shows good agreement with experiments at reduced computational efficiency compared to higher order turbulence models (RSM). Further the importance of mixing with ambient flow is highlighted by identifying areas of significantly reduced velocity recovery within closely spaced tidal turbine arrays where ambient flow does not penetrate between adjacent wakes

AB - Electricity generation from tidal current can provide a reliable and predictable alternative addition to a reduced carbon energy sector in the future. With increasing commercial development and deployment of the first multi-turbine array, significant cost reduction can be achieved by moving beyond demonstrator projects to large scale tidal turbine arrays. For the operational efficiency and safety, the interactions between multiple turbines installed in close proximity can affect the total electricity generation and thus require knowledge of the resulting flow field within and downstream of the array. This paper present results of an experimental and numerical study investigating the flow field characteristics in terms of velocity deficit and turbulence intensity in a staggered section of a tidal turbine array. Multiple configuration with varying longitudinal and transverse spacing between devices in a three-turbine array are tested. Comparison between numerical and experimental flow characteristics shows that open source numerical models with dynamic mesh features achieve good agreement and can be used for the investigation of array wake effects. The standard k – ω SST shows good agreement with experiments at reduced computational efficiency compared to higher order turbulence models (RSM). Further the importance of mixing with ambient flow is highlighted by identifying areas of significantly reduced velocity recovery within closely spaced tidal turbine arrays where ambient flow does not penetrate between adjacent wakes

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Nuernberg M, Tao L. Turbulence and wake effects in tidal stream turbine arrays. 2018. Paper presented at 37th International Conference on Ocean, Offshore & Arctic Engineering, Madrid, Spain. https://doi.org/10.1115/OMAE2018-77507