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Found 2 results

1. ## Design of Wind Turbines

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. ## subsurface Subsurface modeling - Fit a skeg to an aftbody

Hey, If you have been to our Users Meeting 2013 in Berlin in the mid of October you have seen my presentation: Intersecting surface in parametric models: Subsurface modeling. The presentation will be available on our website within the next days. http://www.friendship-systems.com/downloads/presentations This is the live demo project file. It is sorted with multiple numbered scopes. This sorting is helping you to understand the order of creation and makes it easier to reuse it in your own projects. Subsurface: It is the trimming/cutting functionality in CAESES-FFW.Creates a new surface on the basis of an existing parent surface.CAESES-FFW provides some Feature Definitions which will help you creating subsurfaces. Here you can find them: Menu -> Features -> Surfaces -> subsurface or in the CAD Menu next to the object Sub Surface If you have any questions to subsurface modeling please don't hesitate to post them here or contact me. Best regards Karsten UM2013_SubsurfaceModeling.fdb
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