Self-Similarity and helical symmetry in vortex generator flow simulations

The Science of Making Torque from Wind 2012

Fernández, U.^1 ; Velte, Clara M.^2 ; Réthoré, P.-E.^3 ; Sørensen, N.N.^3

Nuclear Engineering and Fluid Mechanics Department, University of the Basque Country, Nieves Cano 12, Vitoria-Gasteiz, Araba

01006, Spain^1

Section of Fluid Mechanics, Department of Wind Energy, Technical University of Denmark, Nils Koppels Allé, Lyngby

2800 Kgs, Denmark^2

DTU Wind Energy Division, Technical University of Denmark, Risø Campus, Frederiksborgvej 399, Roskilde

DK-4000, Denmark^3

关键词: Complex flow;    Helical symmetry;    Parametric study;    Reynolds Averaged Navier-Stokes Equations;    Self-similar;    Self-similarities;    Velocity profiles;    Vortex generators;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/555/1/012036/pdf
DOI  :  10.1088/1742-6596/555/1/012036

来源: IOP

【 摘 要 】

According to experimental observations, the vortices generated by vortex generators have previously been observed to be self-similar for both the axial (uz) and azimuthal (uθ) velocity profiles. Further, the measured vortices have been observed to obey the criteria for helical symmetry. This is a powerful result, since it reduces the highly complex flow to merely four parameters. In the present work, corresponding computer simulations using Reynolds- Averaged Navier-Stokes equations have been carried out and compared to the experimental observations. The main objective of this study is to investigate how well the simulations can reproduce the physics of the flow and if the same analytical model can be applied. Using this model, parametric studies can be significantly reduced and, further, reliable simulations can substantially reduce the costs of the parametric studies themselves.