2D CFD Modeling of H-Darrieus Wind Turbines Using a Transition Turbulence Model

Abstract In the present paper, the authors describe the strategy to develop a 2D CFD model of H-Darrieus Wind Turbines. The model was implemented in ANSYS Fluent solver to predict wind turbines performance and optimize its geometry. As the RANS Turbulence Modeling plays a strategic role for the prediction of the flowfield around wind turbines, different Turbulence Models were tested. The results demonstrate the good capabilities of the Transition SST turbulence model compared to the classical fully turbulent models. The SST Transition model was calibrated modifying the local correlation parameters through a series of CFD tests on aerodynamic coefficients of wind turbines airfoils. The results of the tests were implemented in the 2D model of the wind turbine. The computational domain was structured with a rotating ring mesh and the unsteady solver was used to capture the dynamic stall phenomena and unsteady rotational effects. Both grid and time step were optimized to reach independent solutions. Particularly a high quality 2D mesh was obtained using the ANSYS Meshing tool while a Sliding Mesh Model was used to simulate rotation. Spatial discretization algorithm, interpolation scheme, pressure - velocity coupling and turbulence boundary condition were optimized also. The 2D CFD model was calibrated and validated comparing the numerical results with two different type of H-Darrieus experimental data, available in scientific literature. A good agreement between numerical and experimental data was found. The present work represents the basis to develop an accurate 3D CFD unsteady model and may be used to validate the simplest 1D models and support wind tunnel experiments.

[1]  F. Menter,et al.  A Correlation-Based Transition Model Using Local Variables—Part II: Test Cases and Industrial Applications , 2006 .

[2]  A. Simonović,et al.  Numerical and Analytical Investigation of Vertical Axis Wind Turbine , 2013 .

[3]  T. Maeda,et al.  A straight-bladed vertical axis wind turbine with a directed guide vane row — Effect of guide vane geometry on the performance — , 2009 .

[4]  F. Menter,et al.  A Correlation-Based Transition Model Using Local Variables—Part I: Model Formulation , 2006 .

[5]  J. H. Strickland,et al.  A Vortex Model of the Darrieus Turbine: An Analytical and Experimental Study , 1979 .

[6]  Yingxue Yao,et al.  Double Multiple Streamtube Model and Numerical Analysis of Vertical Axis Wind Turbine , 2011 .

[7]  H. Bijl,et al.  Simulating Dynamic Stall in a 2D VAWT: Modeling strategy, verification and validation with Particle Image Velocimetry data , 2007 .

[8]  Ion Paraschivoiu,et al.  Double-multiple streamtube model for studying vertical-axis wind turbines , 1988 .

[9]  Ernesto Benini,et al.  The Darrieus wind turbine: Proposal for a new performance prediction model based on CFD , 2011 .

[10]  L. B. Wang,et al.  A potential flow 2-D vortex panel model: Applications to vertical axis straight blade tidal turbine , 2007 .

[11]  Payam Sabaeifard,et al.  Determination of Vertical Axis Wind Turbines Optimal Configuration through CFD Simulations , 2012 .

[12]  Jens Nørkær Sørensen,et al.  The Science of Making Torque from Wind , 2007 .

[13]  D. Wilcox.  Turbulence modeling for CFD , 1993 .

[14]  Rajat Gupta,et al.  Computational fluid dynamics analysis of a twisted three-bladed H-Darrieus rotor , 2010 .

[15]  A. Jameson,et al.  Revisiting the Vertical-Axis Wind-Turbine Design Using Advanced Computational Fluid Dynamics , 2005 .

[16]  Jiri Blazek,et al.  Computational Fluid Dynamics: Principles and Applications, Second Edition , 2001 .

[17]  Stefano Mauro,et al.  Wind turbine CFD modeling using a correlation-based transitional model , 2013 .

[18]  Jiri Blazek,et al.  Computational Fluid Dynamics: Principles and Applications , 2001 .

[19]  Joel H. Ferziger,et al.  Computational methods for fluid dynamics , 1996 .

[20]  F. Menter,et al.  Predicting 2D Airfoil and 3D Wind Turbine Rotor Performance using a Transition Model for General CFD Codes , 2006 .

[21]  Niels N. Sørensen.  CFD modelling of laminar‐turbulent transition for airfoils and rotors using the γ − model , 2009 .

[22]  Florian R. Menter,et al.  Transition Modelling for General Purpose CFD Codes , 2006 .

[23]  Baron Gene Brownlee.  A vortex model for the vertical axis wind turbine , 1988 .