Modeling of near wake characteristics in floating offshore wind turbines using an actuator line method

Arabgolarcheh, Alireza; Jannesarahamdi, Sahar; Benini, Ernesto

doi:10.1016/j.renene.2021.12.099

Cited by 40 publications

(14 citation statements)

References 46 publications

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“…As a result, multiple differences can be observed between the wake of a fixedbottom and a floating wind turbine. For example, Arabgolarcheh (2022) used an Actuator Line Model (ALM) CFD approach 95 to show how surge and pitch motions of the platform affect the tip vortices by introducing periodic changes in their strength.…”

Section: Background and Motivationmentioning

confidence: 99%

On the characteristics of the wake of a wind turbine undergoing large motions caused by a floating structure: an insight based on experiments and multi-fidelity simulations from the OC6 Phase III Project

Cioni

Papi

Pagamonci

et al. 2023

Preprint

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Abstract. This study reports the results of the second round of analyses of the OC6 project Phase III. While the first round investigated rotor aerodynamic loading, here focus is given to the wake behavior of a floating wind turbine under large motion. Wind tunnel experimental data from the UNsteady Aerodynamics for FLOating Wind (UNAFLOW) project are compared with the results of simulations provided by participants with methods and codes of different levels of fidelity. The effect of platform motion both on the near and the far wake is investigated. More specifically, the behavior of tip vortices in the near wake is evaluated through multiple metrics, such as streamwise position, core radius, convection velocity, and circulation. Additionally, the onset of velocity oscillations in the far wake is analyzed because this can have a negative effect on stability and loading of downstream rotors. Results in the near wake for unsteady cases confirm that simulations and experiments tend to diverge from the expected linearized quasi-steady behavior when the rotor reduced frequency increases over 0.5. Additionally, differences across the simulations become significant, suggesting that further efforts are required to tune the currently available methodologies in order to correctly evaluate the aerodynamic response of a floating wind turbine in unsteady conditions. Regarding the far wake, it is seen that, in some conditions, numerical methods over-predict the impact of platform motion on the velocity fluctuations. Moreover, results suggest that, different from original expectations about a faster wake recovery in a floating wind turbine, the effect of platform motion on the far wake seems to be limited or even oriented to the generation of a wake less prone to dissipation.

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Section: Background and Motivationmentioning

confidence: 99%

On the characteristics of the wake of a wind turbine undergoing large motions caused by a floating structure: an insight based on experiments and multi-fidelity simulations from the OC6 Phase III Project

Cioni

Papi

Pagamonci

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…For the discretisation of the convective terms, the hybrid differencing scheme was implemented, while for the diffusive terms, a central differencing scheme was applied. The pressure gradient, in (1), is contained in the source term SU of (3) and discretised using the central differencing scheme. All variables (i.e., P, u and v) are stored at the centre of every cell/finite volume (collocated approach) and a corresponding modification [32] is implemented to avoid checkerboard pressure oscillations.…”

Section: Basic Equations and Discretisationmentioning

confidence: 99%

Calculation of the Pressure Field for Turbulent Flow Around a Surface Mounted Cube Using the SIMPLE Algorithm and PIV Data

Pallas¹,

Bouris²

2022

Preprint

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Calculation of the pressure field on and around solid bodies exposed to external flow is of paramount importance to a number of engineering applications. However, conventional pressure measurement techniques are inherently linked to problems principally caused by their point-wise and/or intrusive nature. In the present paper, we attempt to calculate the time-averaged two-dimensional pressure field by integrating PIV (Particle Image Velocimetry) velocity measurements into a CFD code and modifying them by the respective correction step of the SIMPLE algorithm. Boundary conditions are applied from the PIV data as a three-layer area of constant velocities, adjacent to the boundaries. A novel characteristic of the approach is the straightforward inclusion of the Reynolds Stresses into the source terms of the momentum equations, calculated directly from the PIV statistics. The methodology is applied to three regions of the symmetry plane parallel to the main boundary layer flow past a surface mounted cube. In spite of findings of deviations from the planar 2D flow assumption, the derived pressure fields and the adjusted velocity fields are found to be reliable, while the intrinsic turbulent nature of the flow is considered without modelling of the Reynolds stresses.

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“…On the other hand, analytical methods based on Blade Element Momentum (BEM) are still not suitable due to the high degree of approximation and simplification used in their development [9]. Therefore, numerical modelling approaches are considered more efficient due to the increasing computational capacity of modern supercomputers [10]. Recent investigations of wind turbines involve integrating simple wake models into numerical setups.…”

Section: Introductionmentioning

confidence: 99%

Qualitative Investigation of Wake Composition in Offshore Wind Turbines: A Combined Computational and Statistical Analysis of Inner and Outer Blade Sections

Siddiqui,

Badar,

Yang

et al. 2024

E3S Web Conf.

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High-fidelity numerical simulations are used to thoroughly analyze the evolution of the wake behind a megawatt-scale offshore wind turbine. The wake features are classified in terms of wake dynamics composition and the associated turbulence characteristics originating from the inner and outer sections of the blades. Understanding the wake is essential for developing compact layouts for future wind farms. We employed a transient Sliding Mesh Interface (SMI) technique to analyze the fully dynamic wake evolution of the offshore NREL 5MW full turbine. Our high-fidelity results have been validated against previously published results in the literature. We thoroughly investigated the dominant structures of the wake using Proper Orthogonal Decomposition (POD) techniques, which we applied to transient simulations of fully developed flows after five wind turbine revolutions over the snapshot data. Our findings show that the inner section of the blades, which is composed of airfoils with larger cross-sections, is responsible for the dominant components of the wake, while the contribution of the wake from the outer section of the blade is significantly lower. Therefore, designing more aerodynamic sections for the blade’s inner section can help reduce the dominant wake components and thus decrease the inter-turbine distance in future wind farms.

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Modeling of near wake characteristics in floating offshore wind turbines using an actuator line method

Cited by 40 publications

References 46 publications

On the characteristics of the wake of a wind turbine undergoing large motions caused by a floating structure: an insight based on experiments and multi-fidelity simulations from the OC6 Phase III Project

On the characteristics of the wake of a wind turbine undergoing large motions caused by a floating structure: an insight based on experiments and multi-fidelity simulations from the OC6 Phase III Project

Calculation of the Pressure Field for Turbulent Flow Around a Surface Mounted Cube Using the SIMPLE Algorithm and PIV Data

Qualitative Investigation of Wake Composition in Offshore Wind Turbines: A Combined Computational and Statistical Analysis of Inner and Outer Blade Sections

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