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Wind Energy Science The interactive open-access journal of the European Academy of Wind Energy
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Discussion papers
https://doi.org/10.5194/wes-2019-6
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/wes-2019-6
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research articles 11 Feb 2019

Research articles | 11 Feb 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Wind Energy Science (WES).

Adjoint-based Calibration of Inlet Boundary Condition for Atmospheric CFD Solvers

Siamak Akbarzadeh1, Hassan Kassem2, Renko Buhr1, Gerald Steinfeld1, and Bernhard Stoevesandt2 Siamak Akbarzadeh et al.
  • 1ForWind, Center for Wind Energy Research, Carl von Ossietzky University Oldenburg, Küpkersweg 70, 26129 Oldenburg, Germany
  • 2Fraunhofer Institute for Wind Energy Systems - Fraunhofer IWES, Küpkersweg 70, 26129 Oldenburg, Germany

Abstract. A continuous adjoint solver is developed for optimization of the inlet velocity profile boundary condition for CFD simulations of the neutral atmospheric boundary layer (ABL). The adjoint solver uses interior domain wind speed observations to compute the gradient of a calibration function with respect to inlet velocity components and wind direction. The solver has been implemented in the open source CFD package OpenFOAM. The sensitivities computed by the newly developed adjoint solver are validated against the second order finite-difference method. Furthermore, the DAKOTA optimization package is coupled with OpenFOAM, and a number of numerical studies are carried out including the calibration of the inlet velocity profile of a 3-D complex domain.

Siamak Akbarzadeh et al.
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Status: final response (author comments only)
Status: final response (author comments only)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Siamak Akbarzadeh et al.
Siamak Akbarzadeh et al.
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Latest update: 25 Apr 2019
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Short summary
The numerical flow simulation solvers are extensively used for site assessment in the wind energy industry. However, due to the complexity of flow regimes, it is essential to calibrate the important parameters of such algorithms with measurement data. In this paper, we present a computationally cheap (adjoint) solver that can be coupled with any standard gradient-based optimizer to calibrate the inflow boundary of a CFD solver using the wind speed measurements from the interior of a domain.
The numerical flow simulation solvers are extensively used for site assessment in the wind...
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