Numerical study of ice-induced loads and responses of a monopile-type offshore wind turbine in parked and operating conditions

Shi, Wei; Tan, Xiang; Gao, Zhen; Moan, Torgeir

doi:10.1016/j.coldregions.2015.12.007

Cited by 49 publications

(19 citation statements)

References 32 publications

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“…This paper investigates the FL of a 5‐MW wind turbine model with properties provided by the US National Renewable Energy Laboratory (NREL) . Various studies have been based on this wind turbine as a significant amount of data is available for it . In this study, different software packages were used for the fatigue analysis, as shown in Figure .…”

Section: Methodsmentioning

confidence: 99%

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Scour influence on the fatigue life of operational monopile‐supported offshore wind turbines

Rezaei¹,

Duffour²,

Fromme³

2018

Wind Energy

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Offshore wind turbines supported on monopiles are an important source for renewable energy. Their fatigue life is governed by the environmental loads and in the dynamic behavior, depending on the support stiffness and thus soil‐structure interaction. The effects of scour on the short‐term and long‐term responses of the NREL 5‐MW wind turbine under operational conditions have been analyzed by using a finite element beam model with Winkler springs to model soil‐structure interaction. It was found that due to scour, the modal properties of the wind turbine do not change significantly. However, the maximum bending moment in the monopile increases, leading to a significant reduction in fatigue life. Backfilling the scour hole can recover the fatigue life, depending mostly on the depth after backfilling. An approximate fatigue analysis method is proposed, based on the full time‐domain analysis for 1 scour depth, predicting with good accuracy the fatigue life for different scour depths from the quasi‐static changes in the bending moment.

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Section: Methodsmentioning

confidence: 99%

“…30 Various studies have been based on this wind turbine as a significant amount of data is available for it. [31][32][33][34][35][36][37] In this study, different software packages were used for the fatigue analysis, as shown in Figure 1. The preprocessing module TurbSim was used to model the turbulent incoming wind field as an input to FAST.…”

mentioning

confidence: 99%

Scour influence on the fatigue life of operational monopile‐supported offshore wind turbines

Rezaei¹,

Duffour²,

Fromme³

2018

Wind Energy

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“…Some researchers focus on the predictions of the coupled dynamic loads and responses of an OWT [2,21]. Shi et al studied the dynamic ice-structure interaction of a monopile-type OWT in drifting level ice in both parked and operating conditions by coupling a semi-empirical numerical model to the aero-hydro-servo-elastic simulation tool HAWC2 [22]. The effects of ice drifting speed and ice thickness were investigated by using the coupled dynamic analyses.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of the Interaction between Level Ice and Wind Turbine Tower for Estimation of Ice Crushing Loads on Structure

Song

Ren

Zhou

2019

JMSE

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In this paper, the interaction between level ice and wind turbine tower is simulated by the explicit nonlinear code LS-DYNA. The isotropic elasto-plastic material model is used for the level ice, in which ice crushing failure is considered. The effects of ice mesh size and ice failure strain on ice forces are investigated. The results indicate that these parameters have a significant effect on the ice crushing loads. To validate and benchmark the numerical simulations, experimental data on level ice-wind turbine tower interactions are used. First, the failure strains of the ice models with different mesh sizes are calibrated using the measured maximum ice force from one test. Next, the calibrated ice models with different mesh sizes are applied for other tests, and the simulated results are compared to corresponding model test data. The effects of the impact speed and the size of wind turbine tower on the comparison between the simulated and measured results are studied. The comparison results show that the numerical simulations can capture the trend of the ice loads with the impact speed and the size of wind turbine tower. When a mesh size of ice model is 1.5 times the ice thickness, the simulations can give more accurate estimations in terms of maximum ice loads for all tests, i.e., good agreement between the simulated and measured results is achieved.

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“…The effect of response of a wind turbine on the ice loads was not included in the model. Shi et al (2016) developed a simulation program for ice force coupled with the software HAWC2 to study the dynamic effect of ice sheets on the foundation of offshore wind turbines [28]. However, the present method can only be applied to calculate the ice bending load.…”

Section: Introductionmentioning

confidence: 99%

“…To extend the proposed method by Shi et al (2016), the scope of this study aims to improve the dynamic ice-structure interaction model and develop an ice load analysis program to be used for cylindrical and nearly vertical structures. The updated program is used to simulate the non-simultaneous crushing force acting on the cylindrical structures of wind turbines.…”

Section: Introductionmentioning

confidence: 99%

A Simulation of Non-Simultaneous Ice Crushing Force for Wind Turbine Towers with Large Slopes

et al. 2019

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When the offshore wind energy industry attempts to develop in cold regions, ice load becomes the main technological challenge for offshore wind turbine foundation design. Dynamic ice loads acting on wind turbine foundations should be calculated in a reasonable way. The scope of this study is to present a numerical model that considers the non-simultaneous ice crushing failure acting on the vertical structure of a wind turbine’s foundation. The local ice crushing force at the contact surface between the ice sheet and structure is calculated. The boundary of the ice sheet is updated at each time step based on the indentation length of the ice sheet according to its structure. Ice loads are validated against two model tests with three different structure models developed by other researchers. The time series of the ice forces derived from the simulation and model tests are compared. The proposed numerical model can capture the main trends of ice–wind turbine foundation interaction. The simulation results agree well with measured data from the model tests in terms of maximum ice force, which is a key factor for wind turbine design. The proposed model will be helpful for assisting the initial design of wind turbine foundations in cold regions.

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Numerical study of ice-induced loads and responses of a monopile-type offshore wind turbine in parked and operating conditions

Cited by 49 publications

References 32 publications

Scour influence on the fatigue life of operational monopile‐supported offshore wind turbines

Scour influence on the fatigue life of operational monopile‐supported offshore wind turbines

Numerical Study of the Interaction between Level Ice and Wind Turbine Tower for Estimation of Ice Crushing Loads on Structure

A Simulation of Non-Simultaneous Ice Crushing Force for Wind Turbine Towers with Large Slopes

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