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Found 4 results

  1. Hi together, please find attached a parametric model of a costa bulb and a feature definition. To recover the energy which gets lost by the hub vortex of the rotating propeller a costa bulb can help. I integrated the rudder bulb setup into the feature "Spade Rudder" which is shipped with CAESES/FFW. The bare hull to which I attached the appendages is also shipped with CAESES/FFW. All you need as input are some propeller parameters. Please find the feature here: baseline > abdy > appendages > feature:rudder Cheers Matthias (fdb file edited, 30.09.2014) containerVesselCosta.fdb
  2. Hi folks please find attached a Feature Definition for a "Bulbous Bow Shape Analysis" and a Feature Definition which can be used in a CurveEngine for creating a MetaSurface. shapeAnalysis_Bulbous_Bow.fdf bulbous_bow_section.fdf [edited 05.10.14 - tangent analysis included] In order to replace a Bulbous-Bow-IGES-Import by a fully parametric MetaSurface you can use this Feature by execute the following steps: Create a Surface Group including all the IGES-surfacesCreate a new Feature Definition and reload the Analysis-Feature, apply and create the Feature by right click on the Feature Definition>Create FeaturePass the Surface Group to the Analysis-Feature and enter (if necessary) start- and end-position in x-direction of the bulbous bowAdditionally give a number of offsets (30-50 should be a good choice)Run the Feature This will create function curves which can be used to create a MetaSurface. The next steps should be: Re-model the function curves by e.g. FSplineCurvesCreate parameters for some values of the new curves, like start/end position, start/end tangent or area Create a CurveEngineCreate a new Feature Definition, reload the Section-Feature and applySelect the Bulbous-Bow-Section-Feature and pass the new function curves to the EngineAdditionally you can set start- end end-tangent valuesCreate a MetaSurface, select the Curve Engine and set the base positions according to the start- and end-position in x-directionNow you will have a single Metasurface, which is parametric and ready for a design study. Cheers Matthias
  3. Hi folks, please find attached a fully parametric and CFD-ready twisted spade rudder geometry, optional with costa bulb. This design offers you to use your own profile definition for each part of the rudder - the blade, the skeg and the costa bulb. Therefore the respective auxiliary scope consists of a feature which allows you to load a point-data file from your hard disk. In order to provide you a working setup I detached the imported NACA0018 profile (you can find the profile as a NURBS curve "imported_profile" in each auxiliary scope). If you want to use your own profile, simply load the data file and set it as input for the curve engines, respectively the image-profile for the costa bulb. A few requirements have to be considered: The imported profile has to have its leading edge at x=0 and its trailing edge at x=1. Moreover the z-coordinate should be =0 for all points, the profile has to have an open trailing edge and the profile has to be a full profile (e.g. starting at the suction side trailing edge and ending at the pressure side trailing edge). A fully implemented delta shift function twists the imported profile in a way, that the forward part of the profile is shifted in y-direction defined by a twist angle. Furthermore the start of the shift in x-direction, "twist start", as well as the intensity, "twist weight", of the shift can be controlled. The twist angle will twist the lower rudder part half the angle in one direction and upper rudder part half the angle in the other direction. The rudder blade, and the skeg are modeled using metasurfaces, thus the geometry is described by functions, which can be customized as well. The rudder blade is defined by a few typical parameters, such as blade area (= shadow area), blade height, profile chord length at the upper edge and the length of the profile from the rudder shaft to the leading edge at the top and the bottom. In addition you can define the propeller shaft height, the twist angle and the twist transition length, meaning the twist transition between lower and upper blade part in % of the blade length. For a reasonable surface this value should not be smaller than 0.2. All parameters can be found in the parameters scope, sorted by the rudder parts. Finally all surfaces are meshed and joined in a CFD-ready STL. If you want to get rid of the costa bulb simply remove the object from the boolean sum: 03_STL -> twisted_rudderSTL. The idea is, that the rudder STL intersects with a hull STL so that both can be joined in a final STL. Therefore you have to make sure, that the upper part of the rudder skeg lays within the hull overhang. If you have questions, do not hesitate to post them! Cheers Matthias twistedRudder_costaBulb.fdb
  4. Hi All, Please try out this parametric CAESES model of a volute for a blower. The basic shape is controlled by a function (red) to control the offset of the outer shape from the inner circle. If you switch off the visibility of the trimesh (named volute, click on its icon in the object tree) you can see the surface topology behind it. If you are a bit experienced, such a model is set up in 15 min from scratch. Have fun!volute1.fdb
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