Preprints
https://doi.org/10.5194/wes-2021-3
https://doi.org/10.5194/wes-2021-3

  01 Feb 2021

01 Feb 2021

Review status: this preprint was under review for the journal WES but the revision was not accepted.

Numerical Investigation of Aerodynamic Performance of Wind Turbine Airfoils with Ice Accretion

Khaled Yassin1, Hassan Kassem2, Bernhard Stoevesandt2, Thomas Klemme3, and Joachim Peinke1 Khaled Yassin et al.
  • 1ForWind-Centre for Wind Energy Research, Institute of Physics, University of Oldenburg, 26129, Oldenburg, Germany
  • 2Fraunhofer Institute for Wind Energy Systems, Küpkersweg 70, 26129 Oldenburg, Germany
  • 3Senvion GmbH, Überseering 10, 22297 Hamburg, Germany

Abstract. One of the emerging problems in modern computational fluid dynamics is the simulation of flow over rough surfaces, wind turbine blades with ice on its surface for instance. An alternative method to numerically simulate rough surfaces instead of using a grid with y+ < 1 criterion is to use rough wall functions (RWFs) that models the flow behavior in case of the presence of roughness. This work aims to investigate different rough wall function models to find out the model that can provide the most accurate results with the lowest computational resources possible. This aim was achieved by comparing coefficients of lift and pressure resulting from CFD simulations with wind tunnel results of an airfoil with actual ice profiles collected from the site. After implementing new RWFs in OpenFOAM framework and validating the results with published experimental results, the comparison showed that momentum RWF provided the best agreement between simulation and experimental results while using only 25 % of the number of cells used with smooth RWF. The conclusions of this work will be applied in a simulation code within OpenFOAM framework to simulate airflow fields of wind turbines with ice accretion.

Khaled Yassin et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Aerodynamic performance of Iced airfoils', Anonymous Referee #1, 12 Mar 2021
    • AC1: 'Reply on RC1', Khaled Yassin, 12 Apr 2021
  • RC2: 'Comment on wes-2021-3', Joseph Saverin, 14 Mar 2021
    • AC2: 'Reply on RC2', Khaled Yassin, 12 Apr 2021
  • EC1: 'Comment on wes-2021-3', Alessandro Bianchini, 13 Apr 2021
    • AC3: 'Reply on EC1', Khaled Yassin, 15 Apr 2021

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Aerodynamic performance of Iced airfoils', Anonymous Referee #1, 12 Mar 2021
    • AC1: 'Reply on RC1', Khaled Yassin, 12 Apr 2021
  • RC2: 'Comment on wes-2021-3', Joseph Saverin, 14 Mar 2021
    • AC2: 'Reply on RC2', Khaled Yassin, 12 Apr 2021
  • EC1: 'Comment on wes-2021-3', Alessandro Bianchini, 13 Apr 2021
    • AC3: 'Reply on EC1', Khaled Yassin, 15 Apr 2021

Khaled Yassin et al.

Khaled Yassin et al.

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Short summary
When ice forms on wind turbine blades, the smooth surface of the blade becomes rough which changes its aerodynamic performance. So, it is very important to know how to simulate this rough surface since most CFD simulations depend on assuming a smooth surface. This article compares different mathematical models specialized in simulating rough surfaces with results of real ice profiles. The study presents the most accurate model and recommends using it in future airflow simulation of iced blades.