FAST simulations of drifting sea ice loads on offshore wind turbine support structures

Jaakko Heinonen, Simo Rissanen

Research output: Contribution to conferenceConference PosterScientific

Abstract

The Baltic Sea features a potential for large capacity wind farms because of relatively high and constant wind velocities. Mostly shallow coastal areas enable cost-efficient foundation and grid connection. However, in the northern sea area - Gulf of Bothnia - the sea freezes annually. Sea ice loads and ice-induced vibrations due to drifting ice field introduce the most significant uncertainties in the support structure design for offshore wind turbines. The magnitude and time variation of ice load depends on various factors, like the thickness and velocity of the ice as well as the size and shape of the structure. The ice load magnitude and time variation depends on the failure mechanism of ice, which is strongly governed by the shape of the structure at the water level. A feasibility study of the FAST (Fatigue, Aerodynamics, Structures and Turbulence) simulation software was carried out investigating the structural performance of offshore wind turbines. Various load combinations and operation modes were studied by taking into account coupling between the ice, wind and structural response. The results were compared to Finite Element Method (FEM) simulations implemented with an in-house ice load model. FAST with available IceFloe and IceDyn modules form already a good basis to consider various ice load scenario. In addition, open programming interface in FAST creates a suitable development platform making possible to implement advanced ice load models. Coupled modelling of ice-structure interaction is a necessary step in terms of cost-efficient structural design.
Original languageEnglish
Number of pages10
Publication statusPublished - 2015
EventEWEA Annual Event, EWEA 2015 - Paris, France
Duration: 17 Nov 201520 Nov 2015

Conference

ConferenceEWEA Annual Event, EWEA 2015
Abbreviated titleEWEA 2015
CountryFrance
CityParis
Period17/11/1520/11/15

Fingerprint

Offshore wind turbines
Sea ice
Ice
Aerodynamics
Turbulence
Fatigue of materials
Water levels
Structural design
Farms
Costs

Keywords

  • offshore wind turbines
  • sea ice load
  • ice-induced vibration
  • IceDyn
  • FAST

Cite this

Heinonen, J., & Rissanen, S. (2015). FAST simulations of drifting sea ice loads on offshore wind turbine support structures. Poster session presented at EWEA Annual Event, EWEA 2015, Paris, France.
Heinonen, Jaakko ; Rissanen, Simo. / FAST simulations of drifting sea ice loads on offshore wind turbine support structures. Poster session presented at EWEA Annual Event, EWEA 2015, Paris, France.10 p.
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author = "Jaakko Heinonen and Simo Rissanen",
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Heinonen, J & Rissanen, S 2015, 'FAST simulations of drifting sea ice loads on offshore wind turbine support structures' EWEA Annual Event, EWEA 2015, Paris, France, 17/11/15 - 20/11/15, .

FAST simulations of drifting sea ice loads on offshore wind turbine support structures. / Heinonen, Jaakko; Rissanen, Simo.

2015. Poster session presented at EWEA Annual Event, EWEA 2015, Paris, France.

Research output: Contribution to conferenceConference PosterScientific

TY - CONF

T1 - FAST simulations of drifting sea ice loads on offshore wind turbine support structures

AU - Heinonen, Jaakko

AU - Rissanen, Simo

N1 - SDA: MIP: Arctic Project : 104265

PY - 2015

Y1 - 2015

N2 - The Baltic Sea features a potential for large capacity wind farms because of relatively high and constant wind velocities. Mostly shallow coastal areas enable cost-efficient foundation and grid connection. However, in the northern sea area - Gulf of Bothnia - the sea freezes annually. Sea ice loads and ice-induced vibrations due to drifting ice field introduce the most significant uncertainties in the support structure design for offshore wind turbines. The magnitude and time variation of ice load depends on various factors, like the thickness and velocity of the ice as well as the size and shape of the structure. The ice load magnitude and time variation depends on the failure mechanism of ice, which is strongly governed by the shape of the structure at the water level. A feasibility study of the FAST (Fatigue, Aerodynamics, Structures and Turbulence) simulation software was carried out investigating the structural performance of offshore wind turbines. Various load combinations and operation modes were studied by taking into account coupling between the ice, wind and structural response. The results were compared to Finite Element Method (FEM) simulations implemented with an in-house ice load model. FAST with available IceFloe and IceDyn modules form already a good basis to consider various ice load scenario. In addition, open programming interface in FAST creates a suitable development platform making possible to implement advanced ice load models. Coupled modelling of ice-structure interaction is a necessary step in terms of cost-efficient structural design.

AB - The Baltic Sea features a potential for large capacity wind farms because of relatively high and constant wind velocities. Mostly shallow coastal areas enable cost-efficient foundation and grid connection. However, in the northern sea area - Gulf of Bothnia - the sea freezes annually. Sea ice loads and ice-induced vibrations due to drifting ice field introduce the most significant uncertainties in the support structure design for offshore wind turbines. The magnitude and time variation of ice load depends on various factors, like the thickness and velocity of the ice as well as the size and shape of the structure. The ice load magnitude and time variation depends on the failure mechanism of ice, which is strongly governed by the shape of the structure at the water level. A feasibility study of the FAST (Fatigue, Aerodynamics, Structures and Turbulence) simulation software was carried out investigating the structural performance of offshore wind turbines. Various load combinations and operation modes were studied by taking into account coupling between the ice, wind and structural response. The results were compared to Finite Element Method (FEM) simulations implemented with an in-house ice load model. FAST with available IceFloe and IceDyn modules form already a good basis to consider various ice load scenario. In addition, open programming interface in FAST creates a suitable development platform making possible to implement advanced ice load models. Coupled modelling of ice-structure interaction is a necessary step in terms of cost-efficient structural design.

KW - offshore wind turbines

KW - sea ice load

KW - ice-induced vibration

KW - IceDyn

KW - FAST

M3 - Conference Poster

ER -

Heinonen J, Rissanen S. FAST simulations of drifting sea ice loads on offshore wind turbine support structures. 2015. Poster session presented at EWEA Annual Event, EWEA 2015, Paris, France.