The Experts below are selected from a list of 4455 Experts worldwide ranked by ideXlab platform

Pablo M. Carrica - One of the best experts on this subject based on the ideXlab platform.

  • Dynamic overset CFD simulations of wind turbine aerodynamics
    Renewable Energy, 2012
    Co-Authors: Kwang-jun Paik, Tao Xing, Pablo M. Carrica
    Abstract:

    Simulations of the National Renewable Energy Laboratory (NREL) phase VI wind turbine using dynamic oversetgridtechnologyarepresented.Thesimulationsareperformedinaninertialframeofreferencewith the rotor consisting of the blades and hub. The geometries of the tower and nacelle are approximate but includedinthecomputation.ComputationsoftheeffectofwindSpeed(5,10,15and25m/s)ata fixedblade pitch angle of 3 � with Constant Rotational Speed using unsteady Reynolds-Averaged NaviereStokes (RANS) and Detached Eddy Simulation (DES) turbulence models, both showing little difference in the averaged forces and moments. However, significant improvements in the transient response are seen when using DES. The effect of angle of attack is evaluated by dynamically changing the pitch from � 15 � to 40� at

  • dynamic overset cfd simulations of wind turbine aerodynamics
    Renewable Energy, 2012
    Co-Authors: Yuwei Li, Kwang-jun Paik, Tao Xing, Pablo M. Carrica
    Abstract:

    Simulations of the National Renewable Energy Laboratory (NREL) phase VI wind turbine using dynamic overset grid technology are presented. The simulations are performed in an inertial frame of reference with the rotor consisting of the blades and hub. The geometries of the tower and nacelle are approximate but included in the computation. Computations of the effect of wind Speed (5, 10, 15 and 25 m/s) at a fixed blade pitch angle of 3° with Constant Rotational Speed using unsteady Reynolds-Averaged Navier–Stokes (RANS) and Detached Eddy Simulation (DES) turbulence models, both showing little difference in the averaged forces and moments. However, significant improvements in the transient response are seen when using DES. The effect of angle of attack is evaluated by dynamically changing the pitch from −15° to 40° at Constant wind Speed of 15 m/s. Extensive comparison against experimental results, including total power and thrust, sectional performance of normal force coefficient and local pressure coefficient, shows consistently good predictions. The methodology shows a promise for more complex computations including active turbine control by varying the pitch angle and fluid-structure interaction.

  • dynamic overset cfd simulations of wind turbine aerodynamics
    Renewable Energy, 2012
    Co-Authors: Kwang-jun Paik, Tao Xing, Pablo M. Carrica
    Abstract:

    Simulations of the National Renewable Energy Laboratory (NREL) phase VI wind turbine using dynamic overset grid technology are presented. The simulations are performed in an inertial frame of reference with the rotor consisting of the blades and hub. The geometries of the tower and nacelle are approximate but included in the computation. Computations of the effect of wind Speed (5, 10, 15 and 25 m/s) at a fixed blade pitch angle of 3° with Constant Rotational Speed using unsteady Reynolds-Averaged Navier–Stokes (RANS) and Detached Eddy Simulation (DES) turbulence models, both showing little difference in the averaged forces and moments. However, significant improvements in the transient response are seen when using DES. The effect of angle of attack is evaluated by dynamically changing the pitch from −15° to 40° at Constant wind Speed of 15 m/s. Extensive comparison against experimental results, including total power and thrust, sectional performance of normal force coefficient and local pressure coefficient, shows consistently good predictions. The methodology shows a promise for more complex computations including active turbine control by varying the pitch angle and fluid-structure interaction.

Richard E Brown - One of the best experts on this subject based on the ideXlab platform.

  • modelling the aerodynamics of vertical axis wind turbines in unsteady wind conditions
    Wind Energy, 2013
    Co-Authors: Frank Scheurich, Richard E Brown
    Abstract:

    Most numerical and experimental studies of the performance of vertical-axis wind turbines have been conducted with the rotors in steady, and thus somewhat artificial, wind conditions - with the result that turbine aerodynamics, under varying wind conditions, are still poorly understood. The Vorticity Transport Model has been used to investigate the aerodynamic performance and wake dynamics, both in steady and unsteady wind conditions, of three different vertical-axis wind turbines: one with a straight-bladed configuration, another with a curved-bladed configuration and another with a helically twisted configuration. The turbines with non-twisted blades are shown to be somewhat less efficient than the turbine with helically twisted blades when the rotors are operated at Constant Rotational Speed in unsteady wind conditions. In steady wind conditions, the power coefficients that are produced by both the straight- and the curved-bladed turbines vary considerably within one rotor revolution because of the continuously varying angle of attack on the blades and, thus, the inherent unsteadiness in the blade aerodynamic loading. These variations are much larger, and thus far more significant, than those that are induced by the unsteadiness in the wind conditions.

Kwang-jun Paik - One of the best experts on this subject based on the ideXlab platform.

  • Dynamic overset CFD simulations of wind turbine aerodynamics
    Renewable Energy, 2012
    Co-Authors: Kwang-jun Paik, Tao Xing, Pablo M. Carrica
    Abstract:

    Simulations of the National Renewable Energy Laboratory (NREL) phase VI wind turbine using dynamic oversetgridtechnologyarepresented.Thesimulationsareperformedinaninertialframeofreferencewith the rotor consisting of the blades and hub. The geometries of the tower and nacelle are approximate but includedinthecomputation.ComputationsoftheeffectofwindSpeed(5,10,15and25m/s)ata fixedblade pitch angle of 3 � with Constant Rotational Speed using unsteady Reynolds-Averaged NaviereStokes (RANS) and Detached Eddy Simulation (DES) turbulence models, both showing little difference in the averaged forces and moments. However, significant improvements in the transient response are seen when using DES. The effect of angle of attack is evaluated by dynamically changing the pitch from � 15 � to 40� at

  • dynamic overset cfd simulations of wind turbine aerodynamics
    Renewable Energy, 2012
    Co-Authors: Yuwei Li, Kwang-jun Paik, Tao Xing, Pablo M. Carrica
    Abstract:

    Simulations of the National Renewable Energy Laboratory (NREL) phase VI wind turbine using dynamic overset grid technology are presented. The simulations are performed in an inertial frame of reference with the rotor consisting of the blades and hub. The geometries of the tower and nacelle are approximate but included in the computation. Computations of the effect of wind Speed (5, 10, 15 and 25 m/s) at a fixed blade pitch angle of 3° with Constant Rotational Speed using unsteady Reynolds-Averaged Navier–Stokes (RANS) and Detached Eddy Simulation (DES) turbulence models, both showing little difference in the averaged forces and moments. However, significant improvements in the transient response are seen when using DES. The effect of angle of attack is evaluated by dynamically changing the pitch from −15° to 40° at Constant wind Speed of 15 m/s. Extensive comparison against experimental results, including total power and thrust, sectional performance of normal force coefficient and local pressure coefficient, shows consistently good predictions. The methodology shows a promise for more complex computations including active turbine control by varying the pitch angle and fluid-structure interaction.

  • dynamic overset cfd simulations of wind turbine aerodynamics
    Renewable Energy, 2012
    Co-Authors: Kwang-jun Paik, Tao Xing, Pablo M. Carrica
    Abstract:

    Simulations of the National Renewable Energy Laboratory (NREL) phase VI wind turbine using dynamic overset grid technology are presented. The simulations are performed in an inertial frame of reference with the rotor consisting of the blades and hub. The geometries of the tower and nacelle are approximate but included in the computation. Computations of the effect of wind Speed (5, 10, 15 and 25 m/s) at a fixed blade pitch angle of 3° with Constant Rotational Speed using unsteady Reynolds-Averaged Navier–Stokes (RANS) and Detached Eddy Simulation (DES) turbulence models, both showing little difference in the averaged forces and moments. However, significant improvements in the transient response are seen when using DES. The effect of angle of attack is evaluated by dynamically changing the pitch from −15° to 40° at Constant wind Speed of 15 m/s. Extensive comparison against experimental results, including total power and thrust, sectional performance of normal force coefficient and local pressure coefficient, shows consistently good predictions. The methodology shows a promise for more complex computations including active turbine control by varying the pitch angle and fluid-structure interaction.

Frank Scheurich - One of the best experts on this subject based on the ideXlab platform.

  • modelling the aerodynamics of vertical axis wind turbines in unsteady wind conditions
    Wind Energy, 2013
    Co-Authors: Frank Scheurich, Richard E Brown
    Abstract:

    Most numerical and experimental studies of the performance of vertical-axis wind turbines have been conducted with the rotors in steady, and thus somewhat artificial, wind conditions - with the result that turbine aerodynamics, under varying wind conditions, are still poorly understood. The Vorticity Transport Model has been used to investigate the aerodynamic performance and wake dynamics, both in steady and unsteady wind conditions, of three different vertical-axis wind turbines: one with a straight-bladed configuration, another with a curved-bladed configuration and another with a helically twisted configuration. The turbines with non-twisted blades are shown to be somewhat less efficient than the turbine with helically twisted blades when the rotors are operated at Constant Rotational Speed in unsteady wind conditions. In steady wind conditions, the power coefficients that are produced by both the straight- and the curved-bladed turbines vary considerably within one rotor revolution because of the continuously varying angle of attack on the blades and, thus, the inherent unsteadiness in the blade aerodynamic loading. These variations are much larger, and thus far more significant, than those that are induced by the unsteadiness in the wind conditions.

Tao Xing - One of the best experts on this subject based on the ideXlab platform.

  • Dynamic overset CFD simulations of wind turbine aerodynamics
    Renewable Energy, 2012
    Co-Authors: Kwang-jun Paik, Tao Xing, Pablo M. Carrica
    Abstract:

    Simulations of the National Renewable Energy Laboratory (NREL) phase VI wind turbine using dynamic oversetgridtechnologyarepresented.Thesimulationsareperformedinaninertialframeofreferencewith the rotor consisting of the blades and hub. The geometries of the tower and nacelle are approximate but includedinthecomputation.ComputationsoftheeffectofwindSpeed(5,10,15and25m/s)ata fixedblade pitch angle of 3 � with Constant Rotational Speed using unsteady Reynolds-Averaged NaviereStokes (RANS) and Detached Eddy Simulation (DES) turbulence models, both showing little difference in the averaged forces and moments. However, significant improvements in the transient response are seen when using DES. The effect of angle of attack is evaluated by dynamically changing the pitch from � 15 � to 40� at

  • dynamic overset cfd simulations of wind turbine aerodynamics
    Renewable Energy, 2012
    Co-Authors: Yuwei Li, Kwang-jun Paik, Tao Xing, Pablo M. Carrica
    Abstract:

    Simulations of the National Renewable Energy Laboratory (NREL) phase VI wind turbine using dynamic overset grid technology are presented. The simulations are performed in an inertial frame of reference with the rotor consisting of the blades and hub. The geometries of the tower and nacelle are approximate but included in the computation. Computations of the effect of wind Speed (5, 10, 15 and 25 m/s) at a fixed blade pitch angle of 3° with Constant Rotational Speed using unsteady Reynolds-Averaged Navier–Stokes (RANS) and Detached Eddy Simulation (DES) turbulence models, both showing little difference in the averaged forces and moments. However, significant improvements in the transient response are seen when using DES. The effect of angle of attack is evaluated by dynamically changing the pitch from −15° to 40° at Constant wind Speed of 15 m/s. Extensive comparison against experimental results, including total power and thrust, sectional performance of normal force coefficient and local pressure coefficient, shows consistently good predictions. The methodology shows a promise for more complex computations including active turbine control by varying the pitch angle and fluid-structure interaction.

  • dynamic overset cfd simulations of wind turbine aerodynamics
    Renewable Energy, 2012
    Co-Authors: Kwang-jun Paik, Tao Xing, Pablo M. Carrica
    Abstract:

    Simulations of the National Renewable Energy Laboratory (NREL) phase VI wind turbine using dynamic overset grid technology are presented. The simulations are performed in an inertial frame of reference with the rotor consisting of the blades and hub. The geometries of the tower and nacelle are approximate but included in the computation. Computations of the effect of wind Speed (5, 10, 15 and 25 m/s) at a fixed blade pitch angle of 3° with Constant Rotational Speed using unsteady Reynolds-Averaged Navier–Stokes (RANS) and Detached Eddy Simulation (DES) turbulence models, both showing little difference in the averaged forces and moments. However, significant improvements in the transient response are seen when using DES. The effect of angle of attack is evaluated by dynamically changing the pitch from −15° to 40° at Constant wind Speed of 15 m/s. Extensive comparison against experimental results, including total power and thrust, sectional performance of normal force coefficient and local pressure coefficient, shows consistently good predictions. The methodology shows a promise for more complex computations including active turbine control by varying the pitch angle and fluid-structure interaction.