Wake-tracking and turbulence modelling in computational aerodynamics of wind turbine aerofoils

M Campobasso, A Zanon, Edmondo Minisci, A Bonfiglioni

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

This paper addresses two modeling aspects of wind turbine airfoil aerodynamics based on the solution of the Reynolds-averaged Navier-Stokes (RANS) equations. One of these is the effect of an a priori method for structured grid adaptation aimed at improving the wake resolution. Presented results emphasize that the proposed adaptation strategy greatly improves the wake resolution in the far-field, whereas the wake is completely diffused by the non-adapted grid with the same number and spacing patterns of grid nodes. The proposed adaptation approach can be easily included in the structured generation process of both commercial and in-house structured mesh generators systems. The other numerical aspect examined herein is the impact of particular choices for turbulence modelling on the predicted solution. This includes the comparative analysis of numerical solutions obtained by using different turbulence models, and also aims at quantifying the solution inaccuracy arising from not modeling the laminar-to-turbulent transition. It is found that the drag forces obtained by considering the flow as transitional or fully turbulent may differ by 50 %. All these issues are investigated using a special-purpose hyperbolic grid generator and two multi-block structured finite-volume RANS codes. The numerical experiments consider the flow field past a wind turbine airfoil for which an exhaustive campaign of steady and unsteady experimental measurements was conducted. The predictive capabilities of the CFD solvers are validated by comparing experimental data and numerical predictions for selected flow regimes. The incompressible analysis and design code XFOIL is also used to support the findings of the comparative analysis of numerical RANS-based results and experimental data.
LanguageEnglish
Pages939-951
Number of pages13
JournalProceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy
Volume223
Issue number8
DOIs
Publication statusPublished - 1 Dec 2009

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Airfoils
Wind turbines
Computational fluid dynamics
Turbulence
Turbulence models
Navier Stokes equations
Drag
Flow fields
Aerodynamics
Experiments

Keywords

  • wake-tracking
  • turbulence modelling
  • grid generation
  • wind-turbine aerodynamics
  • Reynolds0averaged Navier-Stokes
  • computational fluid dynamics (CFD)

Cite this

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title = "Wake-tracking and turbulence modelling in computational aerodynamics of wind turbine aerofoils",
abstract = "This paper addresses two modeling aspects of wind turbine airfoil aerodynamics based on the solution of the Reynolds-averaged Navier-Stokes (RANS) equations. One of these is the effect of an a priori method for structured grid adaptation aimed at improving the wake resolution. Presented results emphasize that the proposed adaptation strategy greatly improves the wake resolution in the far-field, whereas the wake is completely diffused by the non-adapted grid with the same number and spacing patterns of grid nodes. The proposed adaptation approach can be easily included in the structured generation process of both commercial and in-house structured mesh generators systems. The other numerical aspect examined herein is the impact of particular choices for turbulence modelling on the predicted solution. This includes the comparative analysis of numerical solutions obtained by using different turbulence models, and also aims at quantifying the solution inaccuracy arising from not modeling the laminar-to-turbulent transition. It is found that the drag forces obtained by considering the flow as transitional or fully turbulent may differ by 50 {\%}. All these issues are investigated using a special-purpose hyperbolic grid generator and two multi-block structured finite-volume RANS codes. The numerical experiments consider the flow field past a wind turbine airfoil for which an exhaustive campaign of steady and unsteady experimental measurements was conducted. The predictive capabilities of the CFD solvers are validated by comparing experimental data and numerical predictions for selected flow regimes. The incompressible analysis and design code XFOIL is also used to support the findings of the comparative analysis of numerical RANS-based results and experimental data.",
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Wake-tracking and turbulence modelling in computational aerodynamics of wind turbine aerofoils. / Campobasso, M; Zanon, A; Minisci, Edmondo; Bonfiglioni, A.

In: Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy , Vol. 223, No. 8, 01.12.2009, p. 939-951.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Wake-tracking and turbulence modelling in computational aerodynamics of wind turbine aerofoils

AU - Campobasso, M

AU - Zanon, A

AU - Minisci, Edmondo

AU - Bonfiglioni, A

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AB - This paper addresses two modeling aspects of wind turbine airfoil aerodynamics based on the solution of the Reynolds-averaged Navier-Stokes (RANS) equations. One of these is the effect of an a priori method for structured grid adaptation aimed at improving the wake resolution. Presented results emphasize that the proposed adaptation strategy greatly improves the wake resolution in the far-field, whereas the wake is completely diffused by the non-adapted grid with the same number and spacing patterns of grid nodes. The proposed adaptation approach can be easily included in the structured generation process of both commercial and in-house structured mesh generators systems. The other numerical aspect examined herein is the impact of particular choices for turbulence modelling on the predicted solution. This includes the comparative analysis of numerical solutions obtained by using different turbulence models, and also aims at quantifying the solution inaccuracy arising from not modeling the laminar-to-turbulent transition. It is found that the drag forces obtained by considering the flow as transitional or fully turbulent may differ by 50 %. All these issues are investigated using a special-purpose hyperbolic grid generator and two multi-block structured finite-volume RANS codes. The numerical experiments consider the flow field past a wind turbine airfoil for which an exhaustive campaign of steady and unsteady experimental measurements was conducted. The predictive capabilities of the CFD solvers are validated by comparing experimental data and numerical predictions for selected flow regimes. The incompressible analysis and design code XFOIL is also used to support the findings of the comparative analysis of numerical RANS-based results and experimental data.

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KW - grid generation

KW - wind-turbine aerodynamics

KW - Reynolds0averaged Navier-Stokes

KW - computational fluid dynamics (CFD)

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T2 - Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy

JF - Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy

SN - 0957-6509

IS - 8

ER -