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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-2018-76
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/wes-2018-76
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research articles 21 Jan 2019

Research articles | 21 Jan 2019

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

A vortex-based tip/smearing correction for the actuator line

Alexander Raul Meyer Forsting, Georg Raimund Pirrung, and Néstor Ramos-García Alexander Raul Meyer Forsting et al.
  • DTU Wind Energy, Technical University of Denmark, Frederiksborgvej 399, 4000 Roskilde, Denmark

Abstract. The actuator line was intended as a lifting line technique for CFD applications. In this paper we proof – theoretically and practically – that smearing the forces of the actuator line in the flow domain necessarily leads to smeared velocity fields. By combining a near-wake representation of the trailed vorticity with a viscous vortex core model, the missing induction from the smeared velocity is recovered. This novel dynamic smearing correction is verified for basic wing test cases and rotor simulations of a multi-MW turbine. The latter cover the entire operational wind speed range as well as yaw, strong turbulence and pitch step cases. The correction is validated with lifting line simulations with and without viscous core, that are representative of an actuator line without and with smearing correction, respectively. The dynamic smearing correction makes the actuator line effectively act as a lifting line, as it was originally intended.

Alexander Raul Meyer Forsting et al.
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Status: open (until 08 Mar 2019)
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Alexander Raul Meyer Forsting et al.
Alexander Raul Meyer Forsting et al.
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Short summary
The actuator line was intended as a lifting line technique for CFD applications. In this paper we proof – theoretically and practically – that smearing the forces of the actuator line in the flow domain necessarily leads to smeared velocity fields. By combining a near-wake representation of the trailed vorticity with a viscous vortex core model, the missing induction from the smeared velocity is recovered and a lifting line for CFD simulations established.
The actuator line was intended as a lifting line technique for CFD applications. In this paper...
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