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

Research output: Contribution to journalJournal article – Annual report year: 2019Researchpeer-review

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A vortex-based tip/smearing correction for the actuator line. / Meyer Forsting, Alexander; Pirrung, Georg; Ramos García, Néstor.

In: Wind Energy Science, Vol. 4, 2019, p. 369-383.

Research output: Contribution to journalJournal article – Annual report year: 2019Researchpeer-review

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@article{1109e258a3504f758a3731f4161b28e3,
title = "A vortex-based tip/smearing correction for the actuator line",
abstract = "The actuator line (AL) was intended as a lifting line (LL) technique for computational fluid dynamics (CFD) applications. In this paper we prove – theoretically and practically – that smearing the forces of the actuator line in the flow domain forms a viscous core in the bound and shed vorticity of the line. 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 multimegawatt 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, which 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.",
author = "{Meyer Forsting}, Alexander and Georg Pirrung and {Ramos Garc{\'i}a}, N{\'e}stor",
year = "2019",
doi = "10.5194/wes-4-369-2019",
language = "English",
volume = "4",
pages = "369--383",
journal = "Wind Energy Science",
issn = "2366-7443",
publisher = "Copernicus GmbH",

}

RIS

TY - JOUR

T1 - A vortex-based tip/smearing correction for the actuator line

AU - Meyer Forsting, Alexander

AU - Pirrung, Georg

AU - Ramos García, Néstor

PY - 2019

Y1 - 2019

N2 - The actuator line (AL) was intended as a lifting line (LL) technique for computational fluid dynamics (CFD) applications. In this paper we prove – theoretically and practically – that smearing the forces of the actuator line in the flow domain forms a viscous core in the bound and shed vorticity of the line. 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 multimegawatt 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, which 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.

AB - The actuator line (AL) was intended as a lifting line (LL) technique for computational fluid dynamics (CFD) applications. In this paper we prove – theoretically and practically – that smearing the forces of the actuator line in the flow domain forms a viscous core in the bound and shed vorticity of the line. 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 multimegawatt 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, which 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.

U2 - 10.5194/wes-4-369-2019

DO - 10.5194/wes-4-369-2019

M3 - Journal article

VL - 4

SP - 369

EP - 383

JO - Wind Energy Science

JF - Wind Energy Science

SN - 2366-7443

ER -