Testing of self-similarity and helical symmetry in vortex generator flow simulations

Unai Fernández-Gámiz, Clara Marika Velte, Pierre-Elouan Réthoré, Niels N. Sørensen, Eduard Egusquiza

Research output: Contribution to journalJournal articleResearchpeer-review

1 Downloads (Pure)

Abstract

Vortex generators (VGs) are used increasingly by the wind turbine industry as flow control devices to improve rotor bladeperformance. According to experimental observations, the vortices generated by VGs have previously been observed to beself-similar for both the axial (uz) and azimuthal (u ) velocity components. Furthermore, the measured vortices have beenobserved to obey the criteria for helical symmetry. These are powerful results, as it reduces the highly complex 3-D flow tomerely four parameters and therefore significantly facilitates the modeling of this type of flow, which in a larger perspectivecan assist in parametric studies to increase the total power output of wind turbines. In this study, corresponding computer simulations using Reynolds-averaged Navier–Stokes equations have been carried out and compared with the experimentalobservations. The main objective is to investigate how well the simulations can reproduce these aspects of the physics ofthe flow, i.e., investigate if the same analytical model can be applied and therefore significantly facilitate the modelingof this type of flow, which in a larger perspective can assist in parametric studies to increase the total power output ofwind turbines. This is especially interesting since these types of flows are notoriously difficult for the turbulence models topredict correctly. Using this model, parametric studies can be significantly reduced, and moreover, reliable simulations cansubstantially reduce the costs of the parametric studies themselves. Copyright © 2015 John Wiley & Sons, Ltd.
Original languageEnglish
JournalWind Energy
Volume19
Issue number6
Pages (from-to)1043–1052
Number of pages10
ISSN1095-4244
DOIs
Publication statusPublished - 2016

Cite this

@article{0f6d6d806a974baab50659f356e0036c,
title = "Testing of self-similarity and helical symmetry in vortex generator flow simulations",
abstract = "Vortex generators (VGs) are used increasingly by the wind turbine industry as flow control devices to improve rotor bladeperformance. According to experimental observations, the vortices generated by VGs have previously been observed to beself-similar for both the axial (uz) and azimuthal (u ) velocity components. Furthermore, the measured vortices have beenobserved to obey the criteria for helical symmetry. These are powerful results, as it reduces the highly complex 3-D flow tomerely four parameters and therefore significantly facilitates the modeling of this type of flow, which in a larger perspectivecan assist in parametric studies to increase the total power output of wind turbines. In this study, corresponding computer simulations using Reynolds-averaged Navier–Stokes equations have been carried out and compared with the experimentalobservations. The main objective is to investigate how well the simulations can reproduce these aspects of the physics ofthe flow, i.e., investigate if the same analytical model can be applied and therefore significantly facilitate the modelingof this type of flow, which in a larger perspective can assist in parametric studies to increase the total power output ofwind turbines. This is especially interesting since these types of flows are notoriously difficult for the turbulence models topredict correctly. Using this model, parametric studies can be significantly reduced, and moreover, reliable simulations cansubstantially reduce the costs of the parametric studies themselves. Copyright {\circledC} 2015 John Wiley & Sons, Ltd.",
author = "Unai Fern{\'a}ndez-G{\'a}miz and Velte, {Clara Marika} and Pierre-Elouan R{\'e}thor{\'e} and S{\o}rensen, {Niels N.} and Eduard Egusquiza",
year = "2016",
doi = "10.1002/we.1882",
language = "English",
volume = "19",
pages = "1043–1052",
journal = "Wind Energy",
issn = "1095-4244",
publisher = "JohnWiley & Sons Ltd.",
number = "6",

}

Testing of self-similarity and helical symmetry in vortex generator flow simulations. / Fernández-Gámiz, Unai; Velte, Clara Marika; Réthoré, Pierre-Elouan; Sørensen, Niels N.; Egusquiza, Eduard.

In: Wind Energy, Vol. 19, No. 6, 2016, p. 1043–1052.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Testing of self-similarity and helical symmetry in vortex generator flow simulations

AU - Fernández-Gámiz, Unai

AU - Velte, Clara Marika

AU - Réthoré, Pierre-Elouan

AU - Sørensen, Niels N.

AU - Egusquiza, Eduard

PY - 2016

Y1 - 2016

N2 - Vortex generators (VGs) are used increasingly by the wind turbine industry as flow control devices to improve rotor bladeperformance. According to experimental observations, the vortices generated by VGs have previously been observed to beself-similar for both the axial (uz) and azimuthal (u ) velocity components. Furthermore, the measured vortices have beenobserved to obey the criteria for helical symmetry. These are powerful results, as it reduces the highly complex 3-D flow tomerely four parameters and therefore significantly facilitates the modeling of this type of flow, which in a larger perspectivecan assist in parametric studies to increase the total power output of wind turbines. In this study, corresponding computer simulations using Reynolds-averaged Navier–Stokes equations have been carried out and compared with the experimentalobservations. The main objective is to investigate how well the simulations can reproduce these aspects of the physics ofthe flow, i.e., investigate if the same analytical model can be applied and therefore significantly facilitate the modelingof this type of flow, which in a larger perspective can assist in parametric studies to increase the total power output ofwind turbines. This is especially interesting since these types of flows are notoriously difficult for the turbulence models topredict correctly. Using this model, parametric studies can be significantly reduced, and moreover, reliable simulations cansubstantially reduce the costs of the parametric studies themselves. Copyright © 2015 John Wiley & Sons, Ltd.

AB - Vortex generators (VGs) are used increasingly by the wind turbine industry as flow control devices to improve rotor bladeperformance. According to experimental observations, the vortices generated by VGs have previously been observed to beself-similar for both the axial (uz) and azimuthal (u ) velocity components. Furthermore, the measured vortices have beenobserved to obey the criteria for helical symmetry. These are powerful results, as it reduces the highly complex 3-D flow tomerely four parameters and therefore significantly facilitates the modeling of this type of flow, which in a larger perspectivecan assist in parametric studies to increase the total power output of wind turbines. In this study, corresponding computer simulations using Reynolds-averaged Navier–Stokes equations have been carried out and compared with the experimentalobservations. The main objective is to investigate how well the simulations can reproduce these aspects of the physics ofthe flow, i.e., investigate if the same analytical model can be applied and therefore significantly facilitate the modelingof this type of flow, which in a larger perspective can assist in parametric studies to increase the total power output ofwind turbines. This is especially interesting since these types of flows are notoriously difficult for the turbulence models topredict correctly. Using this model, parametric studies can be significantly reduced, and moreover, reliable simulations cansubstantially reduce the costs of the parametric studies themselves. Copyright © 2015 John Wiley & Sons, Ltd.

U2 - 10.1002/we.1882

DO - 10.1002/we.1882

M3 - Journal article

VL - 19

SP - 1043

EP - 1052

JO - Wind Energy

JF - Wind Energy

SN - 1095-4244

IS - 6

ER -