Effect of steady and transient wind shear on the wake structure and performance of a horizontal axis wind turbine rotor

Sezer-Uzol, Nilay; Uzol, Oguz

doi:10.1002/we.514

Cited by 67 publications

(35 citation statements)

References 33 publications

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“…The simulation times increase as the number of revolutions increase however 27 revolution simulation of the rotor can be obtained in less than an hour whereas it would have taken substantially higher amount of time for the CPU. It is reported previously by using the same CPUbased code, 10 revolutions of data in a serial run took 60 hours on one core of the TR-Grid cluster, which has four AMD Opteron 6172 processors (with 48 cores each; Advanced Micro Devices, Inc., Sunnyvale, CA) with total 128 GB DDR3 memory and two QDR InfiniBand network (80 Gbps) (Sezer-Uzol and Uzol [5]). Figure 5.…”

Section: Resultsmentioning

confidence: 97%

“…Various vortex core models are implemented in the code, such as Vatistas, Scully and Oseen-Lamb models. More information on the code can be found in Sezer-Uzol and Uzol [5].…”

Section: Free-wake Methodologymentioning

confidence: 99%

“…Nevertheless, such difficult engineering problems as wind farm optimization can still require weeks of computation to obtain a meaningful solution. Applications of free-wake methodology to wind turbine rotors and wakes can be found in the literature (Gupta and Leishman [1,2], Hallissy and Chattot [3], Dossing [4], Sezer-Uzol and Uzol [5], Roura et al [6]). Utilization of the free-wake methodology to multiple turbine interaction problems is very limited.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

GPU Based Fast Free-Wake Calculations For Multiple Horizontal Axis Wind Turbine Rotors

Türkal¹,

Novikov²,

Üşenmez³

et al. 2014

J. Phys.: Conf. Ser.

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Abstract. Unsteady free-wake solutions of wind turbine flow fields involve computationally intensive interaction calculations, which generally limit the total amount of simulation time or the number of turbines that can be simulated by the method. This problem, however, can be addressed easily using high-level of parallelization. Especially when exploited with a GPU, a Graphics Processing Unit, this property can provide a significant computational speed-up, rendering the most intensive engineering problems realizable in hours of computation time. This paper presents the results of the simulation of the flow field for the NREL Phase VI turbine using a GPU-based in-house free-wake panel method code. Computational parallelism involved in the free-wake methodology is exploited using a GPU, allowing thousands of similar operations to be performed simultaneously. The results are compared to experimental data as well as to those obtained by running a corresponding CPU-based code. Results show that the GPU based code is capable of producing wake and load predictions similar to the CPUbased code and in a substantially reduced amount of time. This capability could allow freewake based analysis to be used in the possible design and optimization studies of wind farms as well as prediction of multiple turbine flow fields and the investigation of the effects of using different vortex core models, core expansion and stretching models on the turbine rotor interaction problems in multiple turbine wake flow fields. IntroductionWind turbine placement in a wind farm for power optimization requires specialized tools that can provide accurate results in short times. These problems have not yet been tackled efficiently by conventional Computational Fluid Dynamics (CFD) codes, which require too long of a computational time to offer any feasible attempt to solve wind farm wake interaction and layout optimization problems. The blade element momentum theory (BEM), an alternative, provides an exceptional performance from the standpoint of computational time. However, attainable accuracy restricts its use only to preliminary sizing and performance analysis of wind turbines. The advantages of both methods, i.e. high accuracy and low computational time, are offered by free-wake panel methods.

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Section: Resultsmentioning

confidence: 97%

“…Various vortex core models are implemented in the code, such as Vatistas, Scully and Oseen-Lamb models. More information on the code can be found in Sezer-Uzol and Uzol [5].…”

Section: Free-wake Methodologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

GPU Based Fast Free-Wake Calculations For Multiple Horizontal Axis Wind Turbine Rotors

Türkal¹,

Novikov²,

Üşenmez³

et al. 2014

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

show abstract

“…However, compared to the EOG, amplitudes were small. Horizontal axis wind turbines which are hit by an EOG as defined in the IEC 61400-1 were presented by Sezer-Uzol and Uzol (2013). The wind turbine under consideration was the NREL phase VI rotor with a wind speed of 7 m s −1 using the panel code AeroSIM+.…”

Section: Introductionmentioning

confidence: 99%

Simulation of transient gusts on the NREL 5 MW wind turbine using the URANS solver THETA

Länger-Möller¹

2018

Wind Energ. Sci.

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Abstract.A procedure to propagate longitudinal transient gusts through a flow field by using the resolved-gust approach is implemented in the URANS solver THETA. Both the gust strike of a 1 − cos() gust and an extreme operating gust following the IEC 61400-1 standard are investigated on the generic NREL 5 MW wind turbine at rated operating conditions. The impact of both gusts on pressure distributions, rotor thrust, rotor torque, and flow states on the blade are examined and quantified. The flow states on the rotor blade before the gust strike at maximum and minimum gust velocity are compared. An increased blade loading is detectable in the pressure coefficients and integrated blade loads. The friction force coefficients indicate the dynamic separation and reattachment of the flow during the gust. Moreover, a verification of the method is performed by comparing the rotor torque during the extreme operating gust to results of FAST rotor code.

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“…However, amplitudes were small compared 10 to the EOG. Horizontal axis wind turbines which are hit by an EOG as defined in the IEC 64100-1 standard (IEC, 2005) were presented by Uzol et al in 2013 (Sezer-Uzol andUzol, 2013). The wind turbine under consideration was the NREL phase VI rotor with a wind speed of 7 m/s using the panel code AeroSIM+.…”

Section: Introductionmentioning

confidence: 99%

Simulation of transient gusts on the NREL5 MW wind turbine using CFD

Länger-Möller¹

2017

Preprint

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Abstract. The performed work presents a procedure, implemented in the CFD-solver THETA, to propagate longitudinal transient gusts through a flow fi eld by us ing a resolved gust ap proach. Both, the gust st rike of a 1 − cos()-gust and an extreme operating gust following the IEC-64100-1 standard, on the generic NREL 5MW wind turbine at rated operating conditions are investigated with CFD. The impact of both gusts on pressure distributions, rotor thrust, rotor torque, and flow s tates o n the blade are examined and quantified. The flow states on the rotor blade before the gust strike and at maximum and minimum gust velocity are compared. An increased blade loading is detectable in the pressure coefficients and integrated blade loads.The friction force coefficients indicate the dynamic separation and re-attachment of the flow during the gust.

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Effect of steady and transient wind shear on the wake structure and performance of a horizontal axis wind turbine rotor

Cited by 67 publications

References 33 publications

GPU Based Fast Free-Wake Calculations For Multiple Horizontal Axis Wind Turbine Rotors

GPU Based Fast Free-Wake Calculations For Multiple Horizontal Axis Wind Turbine Rotors

Simulation of transient gusts on the NREL 5 MW wind turbine using the URANS solver THETA

Simulation of transient gusts on the NREL5 MW wind turbine using CFD

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