Improving a two-equation eddy-viscosity turbulence model to predict the aerodynamic performance of thick wind turbine airfoils

Bangga, Galih; Kusumadewi, Tri Vicca; Hutomo, Go; Sabila, Ahmad; Syawitri, Taurista Perdana; Setiadi, Herlambang; Faisal, Muhamad; Wiranegara, Raditya Yudha; Hendranata, Yongki; Lastomo, Dwi; Putra, Louis; Stefanus, Kristiadi

doi:10.1088/1742-6596/974/1/012019

Cited by 13 publications

(18 citation statements)

References 19 publications

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“…In the case of the analysis with these two numerical codes, the sensitivity analysis of the numerical solution to changes of computational parameters and mesh distribution was not performed. The numerical grids used in these analyzes were prepared on the basis of the authors' previous experiences [54,56,57]. The numerical grid for the FLOWer code is shown in Figure 4a.…”

Section: Other Cfd Proceduresmentioning

confidence: 99%

“…This is because the DU airfoil series are still young compared to, for example, the well-known NACA airfoil families [49][50][51] or with the popular the S809 airfoil [52]. So far, several works have been devoted to the validation of the aerodynamic performance of DU series profiles using advanced CFD tools [15,[53][54][55][56][57][58][59][60]. All of these articles, except papers [57,59,60], take into account CFD investigation of the DU 91-W2-250 airfoil.…”

Section: Introductionmentioning

confidence: 99%

“…A review of the literature in terms of CFD calculations of the DU airfoil family proves that the two-equation turbulence model k-ω SST is still very often used in analyzes [54,56,57,59]. This is due to the fact that the transition models are not yet adequately validated and that the k-ω SST model is quite stable and less expensive.…”

Section: Introductionmentioning

confidence: 99%

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Accuracy of the Gamma Re-Theta Transition Model for Simulating the DU-91-W2-250 Airfoil at High Reynolds Numbers

et al. 2021

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Accurate computation of the performance of a horizontal-axis wind turbine (HAWT) using Blade Element Momentum (BEM) based codes requires good quality aerodynamic characteristics of airfoils. This paper shows a numerical investigation of transitional flow over the DU 91-W2-250 airfoil with chord-based Reynolds number ranging from 3 × 106 to 6 × 106. The primary goal of the present paper is to validate the unsteady Reynolds averaged Navier-Stokes (URANS) approach together with the four-equation transition SST turbulence model with experimental data from a wind tunnel. The main computational fluid dynamics (CFD) code used in this work was ANSYS Fluent. For comparison, two more CFD codes with the Transition SST model were used: FLOWer and STAR-CCM +. The obtained airfoil characteristics were also compared with the results of fully turbulent models published in other works. The XFOIL approach was also used in this work for comparison. The aerodynamic force coefficients obtained with the Transition SST model implemented in different CFD codes do not differ significantly from each other despite the different mesh distributions used. The drag coefficients obtained with fully turbulent models are too high. With the lowest Reynolds numbers analyzed in this work, the error in estimating the location of the transition was significant. This error decreases as the Reynolds number increases. The applicability of the uncalibrated transition SST approach for a two-dimensional thick airfoil is up to the critical angle of attack.

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Section: Other Cfd Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Accuracy of the Gamma Re-Theta Transition Model for Simulating the DU-91-W2-250 Airfoil at High Reynolds Numbers

et al. 2021

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“…Model tersebut terdiri atas kombinasi dari model standard k-ε [9] di daerah freestream dan Wilcox k-ω model [10] untuk aliran di dekat dinding. SST k-ω merupakan model turbulensi yang baik dalam hal memprediksi aliran dengan pengaruh adverse pressure gradient yang kuat sebagaimana telah digunakan pada simulasi numerik terdahulu Hu dan Wang [6], Bangga dan Sasongko [11], Bangga et al [12], Pape and Lecanu [13], Sørensen et al [14], Weihing et al [15], Jost et al [16], dan Klistafani [17,18]. Gambar Terlihat pada gambar 6 bahwa tidak ada perbedaan peningkatan kecepatan rata-rata yang dihasilkan oleh flat diffuser dengan curved diffuser pada daerah upstream hingga inlet diffuser (x/L = 0).…”

Section: A Tahap Pre-processingunclassified

Pengaruh Desain Interior Diffuser Terhadap Peningkatan Performa Diffuser Augmented Wind Turbine (DAWT)

Klistafani¹,

Mukhsen²

2018

Intek

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The main objective of numerical simulation in thisstudies is to determine the effect of diffuser’s interior design onincreasing the diffuser augmented wind turbine (DAWT)performance by observing wind velocity increment. Numericalstudies were carried out using the computational Fluid Dynamics(CFD) method through a two-dimensional steady approach withAnsys Fluent 18.2 and Ansys Workbench 18.2 software. Thepresent studies spesifically investigate the shapes of diffuser,namely flat diffuser and curved diffuser. The studies demonstratethat the curved diffuser generates stronger increment of the windvelocity than flat diffuser (at centreline), which 1.842 times thefreestream velocity, while the flat diffuser is only able to increseup to 1.742 times the freestream velocity. The curved diffusershows the highest increment of the average wind velocity alongdiffuser with the greatest increment of 78.66 % and the flatdiffuser is only able to provide average wind velocity incrementup to 44.81%. The curved interor of diffuser is able to enlarge thewake area, so the effect of the suction flow entering the diffuserbecomes stronger. Therefore, curved diffuser is better to provideDAWT performance improvements.

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“…This has been reported for instance in ref. [4][5][6][7][8][9][10][11][12][13]. The shape of these airfoils have stronger adverse pressure gradient than thin airfoils, and hence promotes stronger flow separation.…”

Section: Introductionmentioning

confidence: 99%

Aerodynamic and Acoustic Simulations of Thick Flatback Airfoils Employing High Order DES Methods

Bangga

Seel

Lutz

et al. 2022

Advcd Theory and Sims

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The results of high fidelity aerodynamic and acoustic computations of thick flatback airfoils are reported in the present paper. The studies are conducted on a flatback airfoil having a relative thickness of 30% with the blunt trailing edge thickness of 10% relative to chord. Delayed Detached‐Eddy Simulation (DDES) approaches in combination with high order (5th) flux discretization WENO (Weighted Essentially Non‐Oscillatory) and l2Roe$l^{2}Roe$ Riemann solver are employed. Two variants of the DES length scale calculation methods are compared. The results are validated against experimental data with good accuracy. The studies provide guideline on the mesh and turbulence modeling selection for flatback airfoil simulations. The results indicate that the wake breakdown is strongly influenced by the spanwise resolution of the mesh, which directly contributes to the prediction accuracy especially for drag force and noise emission. The Reynolds normal stress u′u′¯$\overline{u^{\prime }u^{\prime }}$ and the u′v′¯$\overline{u^{\prime }v^{\prime }}$ Reynolds stress component have the largest contributions on the mixing process, while the contribution of the u′w′¯$\overline{u^{\prime }w^{\prime }}$ component is minimal. Proper orthogonal decomposition is further performed to gain deeper insights into the wake characteristics.

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Improving a two-equation eddy-viscosity turbulence model to predict the aerodynamic performance of thick wind turbine airfoils

Cited by 13 publications

References 19 publications

Accuracy of the Gamma Re-Theta Transition Model for Simulating the DU-91-W2-250 Airfoil at High Reynolds Numbers

Accuracy of the Gamma Re-Theta Transition Model for Simulating the DU-91-W2-250 Airfoil at High Reynolds Numbers

Pengaruh Desain Interior Diffuser Terhadap Peningkatan Performa Diffuser Augmented Wind Turbine (DAWT)

Aerodynamic and Acoustic Simulations of Thick Flatback Airfoils Employing High Order DES Methods

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