Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 125-134 |
| Seitenumfang | 10 |
| Fachzeitschrift | Journal of Wind Engineering and Industrial Aerodynamics |
| Jahrgang | 179 |
| Publikationsstatus | Veröffentlicht - Aug. 2018 |
| Extern publiziert | Ja |
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.
ASJC Scopus Sachgebiete
- Ingenieurwesen (insg.)
- Tief- und Ingenieurbau
- Energie (insg.)
- Erneuerbare Energien, Nachhaltigkeit und Umwelt
- Ingenieurwesen (insg.)
- Maschinenbau
Ziele für nachhaltige Entwicklung
Zitieren
- Standard
- Harvard
- Apa
- Vancouver
- BibTex
- RIS
in: Journal of Wind Engineering and Industrial Aerodynamics, Jahrgang 179, 08.2018, S. 125-134.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - High-order detached eddy simulation of unsteady flow around NREL S826 airfoil
AU - Yalçın, Özgür
AU - Cengiz, Kenan
AU - Özyörük, Yusuf
N1 - Publisher Copyright: © 2018
PY - 2018/8
Y1 - 2018/8
N2 - 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.
AB - 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.
KW - Attached flows
KW - Delayed detached eddy simulation
KW - Shear layer instability
KW - Shear-layer-adapted length scale
UR - http://www.scopus.com/inward/record.url?scp=85047793367&partnerID=8YFLogxK
U2 - 10.1016/j.jweia.2018.05.017
DO - 10.1016/j.jweia.2018.05.017
M3 - Article
AN - SCOPUS:85047793367
VL - 179
SP - 125
EP - 134
JO - Journal of Wind Engineering and Industrial Aerodynamics
JF - Journal of Wind Engineering and Industrial Aerodynamics
SN - 0167-6105
ER -