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    CFD Sensitivity Analysis of a Straight-Blade Vertical Axis Wind Turbine

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    This paper investigates the flow field features and the predicted power coefficient of a straight blade vertical axis wind turbine (SB-VAWT) using computational fluid dynamics modeling using 2D simulations. The Unsteady Navier-Stokes equations are solved with the concept of Reynolds averaging using the commercial software FLUENT and the sliding mesh technique is applied. In the mesh phase, three parameters have been investigated, namely the cell type, the cell aspect ratio on the airfoil surface, and the total number of cells in the computational domain. In the simulation phase, two parameters have been investigated, namely the time step/Courant number, and the turbulence intensity. Significant differences have been observed in the flow field features and on the predicted power coefficient for some of these parameters which if not considered in details could lead to unreliable predictions. The sensitivity of the parameters is not equally significant and this paper suggests which parameters should be focused on in the modeling process. The convergence behavior of the quadrilateral based mesh is found to be more consistent compared to the triangular based mesh. In the mesh phase, the cell aspect ratio on the airfoil surface was found to be a significant factor, whereas the turbulence intensity was found to be a significant fac-tor in the simulation phase.

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    Description

    Title : CFD Sensitivity Analysis of a Straight-Blade Vertical Axis Wind Turbine
    Author(s) : Khaled M Almohammadi, D B Ingham, L Ma, M Pourkashanian
    Abstract : This paper investigates the flow field features and the predicted power coefficient of a straight blade vertical axis wind turbine (SB-VAWT) using computational fluid dynamics modeling using 2D simulations. The Unsteady Navier-Stokes equations are solved with the concept of Reynolds averaging using the commercial software FLUENT and the sliding mesh technique is applied. In the mesh phase, three parameters have been investigated, namely the cell type, the cell aspect ratio on the airfoil surface, and the total number of cells in the computational domain. In the simulation phase, two parameters have been investigated, namely the time step/Courant number, and the turbulence intensity. Significant differences have been observed in the flow field features and on the predicted power coefficient for some of these parameters which if not considered in details could lead to unreliable predictions. The sensitivity of the parameters is not equally significant and this paper suggests which parameters should be focused on in the modeling process. The convergence behavior of the quadrilateral based mesh is found to be more consistent compared to the triangular based mesh. In the mesh phase, the cell aspect ratio on the airfoil surface was found to be a significant factor, whereas the turbulence intensity was found to be a significant fac-tor in the simulation phase.
    Keywords : Navier-Stokes equations, Wind turbines, wind turbine, Vertical axis wind turbines, Two parameter, Turbulence models, Turbulence modeling, Turbulence intensity, turbulence, Turbomachine blades, Time step, Three parameters, Straight blade vertical axis wind

    Subject : unspecified
    Area : Other
    Language : English
    Year : 2012

    Affiliations ETII
    Journal : Wind Engineering
    Volume : 36
    Issue : 5
    Pages : 571 - 588
    Url : http://multi-science.metapress.com/openurl.asp?genre=article&id=doi:10.1260/0309-524X.36.5.571
    Doi : 10.1260/0309-524X.36.5.571

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