the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Surrogate models for unsteady aerodynamics using non-intrusive Polynomial Chaos Expansions
Rad Haghi
Curran Crawford
Abstract. In common industrial practice based on IEC standards, wind turbine simulations are computed in the time domain for each mean wind speed bin using six unsteady wind seeds. Different software such as FAST, Balded or HAWC2 can be used to this purpose, to capture the unsteadiness and uncertainties of the wind in the simulations. The statistics of these simulations are extracted and used to calculate fatigue and extreme loads on the wind turbine components. Having only six seeds does not guarantee an accurate estimation of the overall statistics. One solution might be running more seeds; however, this will increase the computation cost. Moreover, to move beyond Blade Element Momentum based tools toward vortex/potential flow formulations, a reduction in the computational cost associated with the unsteady flow and uncertainty handling is required. This study illustrates the stationary character of the unsteady aerodynamic statistics based on the standard turbulence models. Afterward, we propose a non-intrusive Polynomial Chaos Expansion to build a surrogate model of the loads' statistics at each time step, to estimate the statistics more accurately and efficiently.
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Rad Haghi and Curran Crawford


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RC1: 'Review of wes-2020-24', Erik Quaeghebeur, 21 May 2020
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AC1: 'Model and article improvements', Rad Haghi, 04 Jun 2020
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AC3: 'Reply on RC1', Rad Haghi, 16 Feb 2021
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AC1: 'Model and article improvements', Rad Haghi, 04 Jun 2020
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RC2: 'Review of WES-2020-24-R0', Anonymous Referee #2, 16 Jun 2020
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AC2: 'Reply on RC2', Rad Haghi, 16 Feb 2021
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AC2: 'Reply on RC2', Rad Haghi, 16 Feb 2021


-
RC1: 'Review of wes-2020-24', Erik Quaeghebeur, 21 May 2020
-
AC1: 'Model and article improvements', Rad Haghi, 04 Jun 2020
-
AC3: 'Reply on RC1', Rad Haghi, 16 Feb 2021
-
AC1: 'Model and article improvements', Rad Haghi, 04 Jun 2020
-
RC2: 'Review of WES-2020-24-R0', Anonymous Referee #2, 16 Jun 2020
-
AC2: 'Reply on RC2', Rad Haghi, 16 Feb 2021
-
AC2: 'Reply on RC2', Rad Haghi, 16 Feb 2021
Rad Haghi and Curran Crawford
Rad Haghi and Curran Crawford
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