Comparison of low-order aerodynamic models and RANS CFD for full scale 3D vertical axis wind turbines

Delafin, Pierre-Luc; Nishino, Takafumi; Kolios, Athanasios; Wang, Lin

doi:10.1016/j.renene.2017.03.065

Cited by 25 publications

(20 citation statements)

References 31 publications

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“…Despite its simplicity and lack of certain flow physics, the DMST model proved reliable in its predictions of the mean power coefficient of the VAWT, for the tested range of parameters. This could be in part due to the fact that our tested tip speed ratios 250 are rather low, while DMST inaccuracies tend to emerge at high tip speed ratios where friction and wake effects are more significant (Delafin et al, 2017). Data availability.…”

Section: Discussionmentioning

confidence: 99%

A Double Multiple Streamtube model for Vertical Axis Wind Turbines of arbitrary rotor loading

Ayati¹,

Steiros²,

Miller³

et al. 2019

Preprint

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Abstract. We introduce an improved formulation of the Double Multiple Streamtube (DMST) model for the prediction of the flow quantities of Vertical Axis Wind Turbines (VAWT). The improvement of the new formulation lies in that it renders the DMST valid for any induction factor, i.e. for any combination of rotor solidity and tip speed ratio. This is done by replacing the Rankine-Froude momentum theory of the DMST, which is invalid for moderate and high induction factors, with a new momentum theory recently proposed, which provides sensible results for any induction factor. The predictions of the two DMST formulations are compared with VAWT power measurements obtained at Princeton's High Reynolds number Test Facility, over a range of tip speed ratios, rotor solidities and Reyonlds numbers, including those experienced by full scale turbines. The results show that the new DMST formulation demonstrates a better overall performance, compared to the conventional one, when the rotor loading is moderate or high.

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Section: Discussionmentioning

confidence: 99%

A Double Multiple Streamtube model for Vertical Axis Wind Turbines of arbitrary rotor loading

Ayati¹,

Steiros²,

Miller³

et al. 2019

Preprint

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“…The turbulent features of the flow are modelled by the transition shear stress transport model (transition SST) of Menter [41,42] which includes the effects of laminar to turbulent transition of the boundary layer on the turbine performance. This model has been employed previously in the simulation of the flow around vertical turbines [25,27,40,43] showing good comparison with experiments. Further details about the advantages of using this turbulence model on the CFWT configuration can be found in [3,27].…”

Section: Turbine Configuration and Simulation Set-upmentioning

confidence: 97%

Numerical Simulation of the Flow around a Straight Blade Darrieus Water Turbine

2020

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In this study, three-dimensional transient numerical simulations of the flow around a cross flow water turbine of the type H-Darrieus are performed. The hydrodynamic characteristics and performance of the turbine are investigated by means of a time-accurate unsteady Reynolds-averaged Navier–Stokes (URANS) commercial solver (ANSYS-Fluent v. 19) where the time dependent rotor-stator interaction is described by the sliding mesh approach. The transition shear stress transport turbulence model has been employed to represent the turbulent dynamics of the underlying flow. Computations are validated versus previous experimental work in terms of the turbine efficiency curve showing good agreement between numerical and experimental values. The behavior of the power and force coefficients as a function of turbine angular speed is analyzed. Moreover, visualizations and analyses of the instantaneous vorticity iso-surfaces developing at different blade rotational velocities are presented including a few movies as additional material. Finally, the fluid variables fields are averaged along a turbine revolution and are compared with the steady predictions of simplified steady approaches based on the blade element momentum theory and the double multiple streamtube method (BEM-DMS).

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“…The numerical models can be categorised into the main types, stream-tube, vortex method and CFD modelling. The study of Delafin et al [40] compared the RANS CFD modelling method with other two low order aerodynamic models (double multiple streamtube model and free-wake vortex mode) based on the prediction of VAWT's performance, examined by Sandia National Laboratories. The models were assessed based on the prediction of the power coefficient, power, thrust, lateral force and instantaneous turbine torque.…”

Section: Micro-small Scalementioning

confidence: 99%

“…Figure 7. Error of the predicted power by CFD, stream-tube, vortex methods from the experiments at several tip speed ratios (TSR) [40].…”

Section: Micro-small Scalementioning

confidence: 99%

A Review of Numerical Modelling of Multi-Scale Wind Turbines and Their Environment

et al. 2018

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Abstract:Global demand for energy continues to increase rapidly, due to economic and population growth, especially for increasing market economies. These lead to challenges and worries about energy security that can increase as more users need more energy resources. Also, higher consumption of fossil fuels leads to more greenhouse gas emissions, which contribute to global warming. Moreover, there are still more people without access to electricity. Several studies have reported that one of the rapidly developing source of power is wind energy and with declining costs due to technology and manufacturing advancements and concerns over energy security and environmental issues, the trend is predicted to continue. As a result, tools and methods to simulate and optimize wind energy technologies must also continue to advance. This paper reviews the most recently published works in Computational Fluid Dynamic (CFD) simulations of micro to small wind turbines, building integrated with wind turbines, and wind turbines installed in wind farms. In addition, the existing limitations and complications included with the wind energy system modelling were examined and issues that needs further work are highlighted. This study investigated the current development of CFD modelling of wind energy systems. Studies on aerodynamic interaction among the atmospheric boundary layer or wind farm terrain and the turbine rotor and their wakes were investigated. Furthermore, CFD combined with other tools such as blade element momentum were examined. Keywords:Computational Fluid Dynamic (CFD); micro to small wind turbine; building integrated with wind turbine; wind farm; aerodynamic interaction; wind energy systems; atmospheric boundary layer (ABL); blade element momentum (BEM)

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Comparison of low-order aerodynamic models and RANS CFD for full scale 3D vertical axis wind turbines

Cited by 25 publications

References 31 publications

A Double Multiple Streamtube model for Vertical Axis Wind Turbines of arbitrary rotor loading

A Double Multiple Streamtube model for Vertical Axis Wind Turbines of arbitrary rotor loading

Numerical Simulation of the Flow around a Straight Blade Darrieus Water Turbine

A Review of Numerical Modelling of Multi-Scale Wind Turbines and Their Environment

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