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High-Fidelity Calculation of Floating Offshore Wind Turbines Under Pitching Motion

Research output: Contribution in Book/Report/Proceedings - With ISBN/ISSN › Conference contribution/Paper › peer-review

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High-Fidelity Calculation of Floating Offshore Wind Turbines Under Pitching Motion. / Ortolani, Andrea; Persico, Giacomo; Drofelnik, Jernej et al.
ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition: Wind Energy. Vol. 12 The American Society of Mechanical Engineers, 2021. GT2020-15552.

Research output: Contribution in Book/Report/Proceedings - With ISBN/ISSN › Conference contribution/Paper › peer-review

Harvard

Ortolani, A, Persico, G, Drofelnik, J, Jackson, A & Campobasso, S 2021, High-Fidelity Calculation of Floating Offshore Wind Turbines Under Pitching Motion. in ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition: Wind Energy. vol. 12, GT2020-15552, The American Society of Mechanical Engineers, ASME Turbo Expo Technical Conference, 21/09/20. https://doi.org/10.1115/GT2020-15552

APA

Ortolani, A., Persico, G., Drofelnik, J., Jackson, A., & Campobasso, S. (2021). High-Fidelity Calculation of Floating Offshore Wind Turbines Under Pitching Motion. In ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition: Wind Energy (Vol. 12). Article GT2020-15552 The American Society of Mechanical Engineers. https://doi.org/10.1115/GT2020-15552

Vancouver

Ortolani A, Persico G, Drofelnik J, Jackson A, Campobasso S. High-Fidelity Calculation of Floating Offshore Wind Turbines Under Pitching Motion. In ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition: Wind Energy. Vol. 12. The American Society of Mechanical Engineers. 2021. GT2020-15552 doi: 10.1115/GT2020-15552

Author

Ortolani, Andrea ; Persico, Giacomo ; Drofelnik, Jernej et al. / High-Fidelity Calculation of Floating Offshore Wind Turbines Under Pitching Motion. ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition: Wind Energy. Vol. 12 The American Society of Mechanical Engineers, 2021.

Bibtex

@inproceedings{67bbc68b56d34a9aafbaf4e96c0bfbe9,
title = "High-Fidelity Calculation of Floating Offshore Wind Turbines Under Pitching Motion",
abstract = "The unsteady aerodynamics of floating offshore wind turbine (FOWT) rotors is more complex than that of fixed–bottom turbine rotors, and the uncertainty of low-fidelity aerodynamic predictions, such as those of the blade element momentum theory (BEMT) codes, is higher for the former rotors. Navier-Stokes CFD can improve the understanding of FOWT rotor and wake aerodynamics, and help improve lower-fidelity models. To highlight this potential, blade–resolved analyses of the in-house compressible CFD COSA code and the commercial incompressible CFD code FLUENT were used to investigate the unsteady flow of the NREL 5 MW rotor subjected to prescribed harmonic pitching past the tower base. CFD results were compared to the predictions of the FAST wind turbine code, using BEMT for rotor aerodynamics. Improved tuning of the COSA numerical set-up enabled close matching of the FAST rotor power and loads in fixed–tower mode, and high resolution of the near field wake dynamics; similar agreement levels were obtained with the FLUENT simulations. A novel user-defined function approach, enforcing an additional rigid body motion of the rotor grid conformal to the tower motion, enabled the FLUENT FOWT rotor simulations of this study, and provided new general-purpose FLUENT functionalities for FOWT analyses. All predicted periodic patterns of rotor power and thrust were found to be qualitatively similar, but the power peaks of both CFD predictions were significantly higher than those of FAST. Inspection of the CFD profiles of blade static pressure highlighted and quantified significant compressible flow effects on FOWT rotor power and loads. The blade–resolved analyses of the rotor downstream flow field revealed wake features unique to pitching turbine rotors, primarily the space- and time–dependence of the wake generation, highlighted by the intermittency of the tip vortex shedding.",
keywords = "floating wind turbine rotors, navier-stokes computatinal fluid dynamics, rotor loads and wakes, blade element momentum theory",
author = "Andrea Ortolani and Giacomo Persico and Jernej Drofelnik and Adrian Jackson and Sergio Campobasso",
year = "2021",
month = jan,
day = "11",
doi = "10.1115/GT2020-15552",
language = "English",
volume = "12",
booktitle = "ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition",
publisher = "The American Society of Mechanical Engineers",
note = "ASME Turbo Expo Technical Conference : Online virtual event ; Conference date: 21-09-2020 Through 25-09-2020",

}

RIS

TY - GEN

T1 - High-Fidelity Calculation of Floating Offshore Wind Turbines Under Pitching Motion

AU - Ortolani, Andrea

AU - Persico, Giacomo

AU - Drofelnik, Jernej

AU - Jackson, Adrian

AU - Campobasso, Sergio

PY - 2021/1/11

Y1 - 2021/1/11

N2 - The unsteady aerodynamics of floating offshore wind turbine (FOWT) rotors is more complex than that of fixed–bottom turbine rotors, and the uncertainty of low-fidelity aerodynamic predictions, such as those of the blade element momentum theory (BEMT) codes, is higher for the former rotors. Navier-Stokes CFD can improve the understanding of FOWT rotor and wake aerodynamics, and help improve lower-fidelity models. To highlight this potential, blade–resolved analyses of the in-house compressible CFD COSA code and the commercial incompressible CFD code FLUENT were used to investigate the unsteady flow of the NREL 5 MW rotor subjected to prescribed harmonic pitching past the tower base. CFD results were compared to the predictions of the FAST wind turbine code, using BEMT for rotor aerodynamics. Improved tuning of the COSA numerical set-up enabled close matching of the FAST rotor power and loads in fixed–tower mode, and high resolution of the near field wake dynamics; similar agreement levels were obtained with the FLUENT simulations. A novel user-defined function approach, enforcing an additional rigid body motion of the rotor grid conformal to the tower motion, enabled the FLUENT FOWT rotor simulations of this study, and provided new general-purpose FLUENT functionalities for FOWT analyses. All predicted periodic patterns of rotor power and thrust were found to be qualitatively similar, but the power peaks of both CFD predictions were significantly higher than those of FAST. Inspection of the CFD profiles of blade static pressure highlighted and quantified significant compressible flow effects on FOWT rotor power and loads. The blade–resolved analyses of the rotor downstream flow field revealed wake features unique to pitching turbine rotors, primarily the space- and time–dependence of the wake generation, highlighted by the intermittency of the tip vortex shedding.

AB - The unsteady aerodynamics of floating offshore wind turbine (FOWT) rotors is more complex than that of fixed–bottom turbine rotors, and the uncertainty of low-fidelity aerodynamic predictions, such as those of the blade element momentum theory (BEMT) codes, is higher for the former rotors. Navier-Stokes CFD can improve the understanding of FOWT rotor and wake aerodynamics, and help improve lower-fidelity models. To highlight this potential, blade–resolved analyses of the in-house compressible CFD COSA code and the commercial incompressible CFD code FLUENT were used to investigate the unsteady flow of the NREL 5 MW rotor subjected to prescribed harmonic pitching past the tower base. CFD results were compared to the predictions of the FAST wind turbine code, using BEMT for rotor aerodynamics. Improved tuning of the COSA numerical set-up enabled close matching of the FAST rotor power and loads in fixed–tower mode, and high resolution of the near field wake dynamics; similar agreement levels were obtained with the FLUENT simulations. A novel user-defined function approach, enforcing an additional rigid body motion of the rotor grid conformal to the tower motion, enabled the FLUENT FOWT rotor simulations of this study, and provided new general-purpose FLUENT functionalities for FOWT analyses. All predicted periodic patterns of rotor power and thrust were found to be qualitatively similar, but the power peaks of both CFD predictions were significantly higher than those of FAST. Inspection of the CFD profiles of blade static pressure highlighted and quantified significant compressible flow effects on FOWT rotor power and loads. The blade–resolved analyses of the rotor downstream flow field revealed wake features unique to pitching turbine rotors, primarily the space- and time–dependence of the wake generation, highlighted by the intermittency of the tip vortex shedding.

KW - floating wind turbine rotors

KW - navier-stokes computatinal fluid dynamics

KW - rotor loads and wakes

KW - blade element momentum theory

U2 - 10.1115/GT2020-15552

DO - 10.1115/GT2020-15552

M3 - Conference contribution/Paper

VL - 12

BT - ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition

PB - The American Society of Mechanical Engineers

T2 - ASME Turbo Expo Technical Conference

Y2 - 21 September 2020 through 25 September 2020

ER -