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

Yalcin, Ozgur; Cengiz, Kenan; Özyörük, Yusuf

doi:10.1016/j.jweia.2018.05.017

Cited by 11 publications

(2 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They investigated the influences of computational mesh resolution and spanwise size on the computational results [17]. Yalçın et al improved the DDES model by two different length scale definitions [18]. It was found that compared with DDES, the results of shear-layer-adapted DDES (SLADDES) were better, in agreement with the experiments.…”

Section: Introductionmentioning

confidence: 83%

Accurate Stall Prediction for Thick Airfoil by Delayed Detached-Eddy Simulations

Shi¹,

Zhu²,

Li³

et al. 2022

Atmosphere

View full text Add to dashboard Cite

The continuous increase in wind turbine blade length raises a serious question about how to effectively reduce the blade mass. As one of the solutions, recently, some wind turbine manufacturers are moving towards longer blades with thicker airfoils. As most of the numerical simulation experiences are based on thin airfoils, the present paper focused on airfoils with thickness to chord ratios of 30% and specifically focused on the influence of spanwise length on the numerical results. Airfoils with a spanwise length of 0.1 to 5 chords were simulated utilizing the Delayed Detached-Eddy Simulations (DDES) approach. One of the important objectives was to identify the necessary grid resolution and configuration while still maintaining accuracy under a deep stall situation. It was found that the spanwise length of the computational domain had a crucial influence on the prediction of lift and drag. At a stall angle of attack, the aerodynamic force could not be accurately predicted when the airfoil span was reduced to 0.3 chords, even with a high grid density. The periodicity of the spanwise flow was clearly visible when the airfoil span was extended to 5 chords.

show abstract

Section: Introductionmentioning

confidence: 83%

Accurate Stall Prediction for Thick Airfoil by Delayed Detached-Eddy Simulations

Shi¹,

Zhu²,

Li³

et al. 2022

Atmosphere

View full text Add to dashboard Cite

show abstract

“…Xu et al [32] investigated the flow over airfoils at a wide range of attacks. Yalçın et al [33] explored the effects of two different length scale definitions in the simulation of the flow around an airfoil. Wang et al [34] discussed the effects of the time step, spanwise lengths, and grid resolution on the prediction of flow around an airfoil beyond stall.…”

Section: Of 20mentioning

confidence: 99%

Numerical Simulation of the Flow around NACA0018 Airfoil at High Incidences by Using RANS and DES Methods

Guo

Zou

2022

JMSE

View full text Add to dashboard Cite

In this work, the flow around the NACA0018 airfoil with a wide range of attack angles was investigated based on the open-source computational fluid dynamics (CFD) platform OpenFOAM. Two numerical methods, Reynolds-averaged Navier–Stokes (RANS) and the detached eddy simulation (DES), were employed. Under the premise of a grid convergence analysis, the computed lift and drag coefficients were validated by the available experimental data. The pressure distribution, the complex flow mechanisms of the airfoil under the attached flow regime, the mild separation flow regime, and the post-stall flow regime, combined with the shedding vortex structures, streamlines, and vorticity distributions, are discussed. From the numerical results, it can be seen that the DES computation presents a better accuracy in the prediction of the lift and drag coefficients, with a deviation less than 10% at the largest angle of attack. Meanwhile, it also presents remarkable improvements in capturing the local flow field details, such as the unsteady separated flow and the shedding vortex structures.

show abstract

Experiences with two detached eddy simulation approaches through use of a high‐order finite volume solver

Cengiz

Özyörük

2020

Numerical Methods in Fluids

View full text Add to dashboard Cite

SummaryIn the present study, two advanced detached eddy simulation (DES) approaches, shear‐layer‐adapted delayed DES and zonal DES in mode II, which are known to help transition from RANS to LES mode, are employed in various flow problems in conjunction with a high‐order finite volume solver. The numerical scheme, being only applicable on structured grids, has low‐dissipation and low‐dispersion features. Such features benefit mostly in the LES mode, minimizing the interference of numerical diffusion with subgrid eddy viscosity. First, corresponding subgrid models are validated via decaying homogeneous turbulence benchmark case. Then, a channel flow problem is chosen to examine these models in attached flow situations. Finally, flow around an airfoil at low Reynolds number is solved using the shear‐layer‐adapted delayed DES approach only, in an aim to obtain trailing‐edge noise spectrum at an observer location. Despite some log‐layer mismatch over turbulent boundary layers, which is typical of most DES methods, the combined application of high‐resolution numerical method and advanced DES approaches, which are implemented on a stabilized Spalart‐Allmaras turbulence model, shows merit in resolution of turbulence in regions of interest.

show abstract

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

Cited by 11 publications

References 47 publications

Accurate Stall Prediction for Thick Airfoil by Delayed Detached-Eddy Simulations

Accurate Stall Prediction for Thick Airfoil by Delayed Detached-Eddy Simulations

Numerical Simulation of the Flow around NACA0018 Airfoil at High Incidences by Using RANS and DES Methods

Experiences with two detached eddy simulation approaches through use of a high‐order finite volume solver

Contact Info

Product

Resources

About