Turbulent Navier–Stokes analysis of an oscillating wing in a power-extraction regime using the shear stress transport turbulence model

Campobasso, M. Sergio; Piskopakis, Andreas; Drofelnik, Jernej; Jackson, Adrian

doi:10.1016/j.compfluid.2013.08.016

Cited by 33 publications

(50 citation statements)

References 28 publications

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“…(12) is the exact term resulting from the point-implicit integration of the k − ω model, but it is instead an approximation in the case of the SST model. The exact term for the SST case has also a nonzero (5,6) entry [37]. Numerical experiments, however, reveal that the results computed with either Eqn.…”

mentioning

confidence: 79%

“…All COSA solvers have been thoroughly verified and validated as reported in [11,37,26,38,42]. This section presents the analysis of the two-dimensional obtained using the yawed wind reduction model reported in [11], to which the 445 reader is referred for further detail.…”

Section: Horizontal Axis Wind Turbine Blade Sectionmentioning

confidence: 99%

“…In moving-body problems, the governing equations are solved in the absolute frame of reference, where the whole computational grid moves with a rigid body motion conforming to the user-given motion of the considered geometry (e.g. rotor bulent source terms is based on second order finite-differencing, as reported in [37]. That article also provides the definitions of the viscous wall and far field boundary conditions used by COSA.…”

Section: Space Discretizationmentioning

confidence: 99%

“…The finite volume cell-centered parallel CFD code COSA [37,26,38,39] 290 solves the integral form of both the T D conservation laws (System (1)) and the HB conservation laws (System (8)) using structured multi-block grids. In moving-body problems, the governing equations are solved in the absolute frame of reference, where the whole computational grid moves with a rigid body motion conforming to the user-given motion of the considered geometry (e.g.…”

Section: Space Discretizationmentioning

confidence: 99%

“…To alleviate this problem, a point-implicit integration strategy is adopted [34], whereby the abovesaid source terms are treated implicitly within each RK stage. Adopting this approach (see [37] for the detailed derivation), the steady turbulent point-implicit RK (PIRK) smoother reads:…”

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confidence: 99%

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Comparative assessment of the harmonic balance Navier–Stokes technology for horizontal and vertical axis wind turbine aerodynamics

2016

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mentioning

confidence: 79%

Section: Horizontal Axis Wind Turbine Blade Sectionmentioning

confidence: 99%

Section: Space Discretizationmentioning

confidence: 99%

Section: Space Discretizationmentioning

confidence: 99%

mentioning

confidence: 99%

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Comparative assessment of the harmonic balance Navier–Stokes technology for horizontal and vertical axis wind turbine aerodynamics

2016

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Harmonic balance Navier‐Stokes aerodynamic analysis of horizontal axis wind turbines in yawed wind

2018

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Multimegawatt horizontal axis wind turbines often operate in yawed wind transients, in which the resulting periodic loads acting on blades, drive-train, tower, and foundation adversely impact on fatigue life. Accurately predicting yawed wind turbine aerodynamics and resulting structural loads can be challenging and would require the use of computationally expensive high-fidelity unsteady Navier-Stokes computational fluid dynamics. The high computational cost of this approach can be significantly reduced by using a frequency-domain framework. The paper summarizes the main features of the COSA harmonic balance Navier-Stokes solver for the analysis of open rotor periodic flows, presents initial validation results on the basis of the analysis of the NREL Phase VI experiment, and it also provides a sample application to the analysis of a multimegawatt turbine in yawed wind. The reported analyses indicate that the harmonic balance solver determines the considered periodic flows from 30 to 50 times faster than the conventional time-domain approach with negligible accuracy penalty to the latter. KEYWORDS harmonic balance Navier-Stokes equations, horizontal axis wind turbine aerodynamics, NREL Phase VI wind turbine, NREL 5 MW wind turbine, yawed wind aerodynamics 1 INTRODUCTION Wind energy is a key low-carbon energy source, playing a crucial role in lowering global greenhouse gas emissions, and it is now viewed as one of the most cost-effective climate change mitigation technologies. Current utility-scale horizontal axis wind turbines (HAWTs) already feature fairly high aerodynamic efficiencies; however, because of the spatial and temporal variability of the environmental conditions, HAWTs often experience unsteady flow conditions, which induce fatigue and lower the energy harvest. Several of such regimes can be viewed as periodic, and typical examples include the blades rotating (a) through stratifications of the atmosphere associated with the atmospheric boundary layer, with the wind velocity varying by as much as 6 m/s over a 100-m rotor diameter, 1 (b) through the variable pressure field due to the downwind tower, and (c) in yawed wind, occurring when the freestream wind velocity is no longer orthogonal to the turbine rotor. 2 In all these cases, the fundamental frequency of the periodic excitation is a multiple of the rotor speed.Regarding yawed wind, utility-scale HAWTs typically feature yaw control systems that monitor the wind direction and turn the entire nacelle to realign wind and rotor normal. 2 Yaw actuators, however, adjust the nacelle position after a relatively long time interval from the yaw misalignment detection, and thus, fatigue due to yaw misalignment can be significant. The yawed wind condition also reduces the power produced by the turbine, and the reduction increases nonlinearly with the cosine of the yaw misalignment. Above certain wind speed-and turbine-dependent yaw misalignment thresholds, dynamic stall also occurs, and this aggravates further unsteady loads because of hysteretic force and mom...

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Harmonic Balance Navier–Stokes Analysis of Tidal Stream Turbine Wave Loads

Cavazzini

Campobasso

Marconcini

et al. 2019

Recent Advances in CFD for Wind and Tidal Offshore Turbines

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ARCTIC, a novel incompressible Reynolds-averaged Navier-Stokes finite volume code for the hydrodynamic analysis of open rotor unsteady loads is presented. One of its unique features is a harmonic balance solver enabling high-fidelity analyses of turbine periodic hydrodynamic loads with runtimes reduced by more than one order of magnitude over conventional time-domain CFD, and with negligible accuracy penalty. The strength of the new technology is demonstrated by analyzing with both harmonic balance and time-domain solvers the load fluctuations of a realistic tidal stream turbine. Such fluctuations are caused by a harmonic perturbation of the freestream velocity similar to that due to surface gravity waves.

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Turbulent Navier–Stokes analysis of an oscillating wing in a power-extraction regime using the shear stress transport turbulence model

Cited by 33 publications

References 28 publications

Comparative assessment of the harmonic balance Navier–Stokes technology for horizontal and vertical axis wind turbine aerodynamics

Comparative assessment of the harmonic balance Navier–Stokes technology for horizontal and vertical axis wind turbine aerodynamics

Harmonic balance Navier‐Stokes aerodynamic analysis of horizontal axis wind turbines in yawed wind

Harmonic Balance Navier–Stokes Analysis of Tidal Stream Turbine Wave Loads

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