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  1. Hi all, attached is an example of a wind turbine. This surface model is based on empiric [burton, 2011. Wind Energy handbook] radial distribution of chord and pitch, which are dependend by the Design Angle of Attack (AOA)Lift CoefficientRadiusTip Speed RatioThe Lift Coefficient can be determined, by empiric equations (0.1*(AOA+4┬░)[burton,2011]), taken from tables or can be determined with other ways. The Profile based on a cambered NACA-4ds. The Tip Speed Ratio is given by (Pi*D*n_R/v_w), where n_R is the rotational speed, and v_w the design wind velocity. The angle of the rotation can be varied as well, to avoid contact of the blades with the shaft in stormy conditions. A design attribute of this wind turbine is, that the maximum chord length is modeled up to the hub, which should enlarge the total power coefficient, because of less speration losses. This is reached with a little stationary wing part at the hub, where the design pitch angle should be that from the design wind velocity and tip speed ratio. Furthermore this example shows tip and subsurface modulation. WindTurbine.fdb
  2. Hey, attached is an example of a vertical axis wind turbine, modeled in CAESES. It is fully parametrized, so that an optimization with an external cfd tool can easily be executed. The shape can be varied from straight blades up to blades that are twisted around the vertical axis (helix). The helix shape helps to minimize the effects of uneven distributed forces along the axis and during the rotation. As a result the VAWT will oscilate less which makes it more robust. Further design parameters: pitchcambercamber positionchord lengthradiusmid radiusI created a simple cfd calculation with STARCCM+ to show some post processing functionalities. Have fun with the model cheers vertWind_forum1.fdb
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