High-order detached eddy simulation of unsteady flow around NREL S826 airfoil

verfasst von

Özgür Yalçın, Kenan Cengiz, Yusuf Özyörük

Abstract

Delayed detached eddy simulation (DDES) has been a common approach for unsteady turbulent flow problems, but it has several weaknesses which limit its use to detached flows. On the other hand, some enhancements introduced recently have made it possible to apply to attached flows as well. In the present investigation, flow with relatively low Reynolds numbers of 100,000 and 145,000 around NREL S826 airfoil is simulated using DDES models with two different length scale definitions: standard length scale and shear-layer-adapted length scale (SLADDES). The solver, originally developed for aeroacoustic simulations, features fourth-order spatial accuracy enhanced with symmetry-preserving and dispersion-relation-preserving characteristics. Simulations are done at various angles of attack around stall regions. Results are compared with other simulations and measurements. The present results indicate that SLADDES accelerates transition from modeled turbulence mode to resolved turbulence mode even in attached flows. Consequently, SLADDES shows aerodynamic results in better agreement with the experiments than the standard DDES, and allows coarser grids thanks to low sensitivity to spanwise grid spacings. Moreover, it appears that both DDES and SLADDES approaches benefit from the low-dissipation, low-dispersion, and high-order scheme of the solver.

Externe Organisation(en)

Middle East Technical University (METU)

Typ

Artikel

Journal

Journal of Wind Engineering and Industrial Aerodynamics

Band

179

Seiten

125-134

Anzahl der Seiten

10

ISSN

0167-6105

Publikationsdatum

08.2018

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Tief- und Ingenieurbau, Erneuerbare Energien, Nachhaltigkeit und Umwelt, Maschinenbau

Ziele für nachhaltige Entwicklung

SDG 7 – Erschwingliche und saubere Energie

Elektronische Version(en)

https://doi.org/10.1016/j.jweia.2018.05.017 (Zugang: Geschlossen)