Bramesfeld, G. and Maughmer, M.D. and Horstmann, K.H. (2004) A Free-Wake, Lifting-Surface Model using Distributed Vorticity Elements. 22nd AIAA Applied Aerodynamics Conference, Providence (usa), 16.-19.08.2004.
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A higher-order, lifting-surface method is presented that uses elements whose streamwise vorticity is distributed on a vortex sheet that lays vortex filaments, each having the transverse vorticity concentrated along its length, that form the leading and trailing edges of each element. The vortex filaments have a parabolic circulation distribution in spanwise direction and are of opposite signs. The vortex sheet has a linearly varying vorticity. An analytical solution is used to determine the velocity that is induced by each element at a particular location. One or several spanwise systems of such elements are used to model the lifting surface and the wake. The free wake is developed using a time-stepping method. The elements in the wake stretch and compress in spanwise direction during the roll-up process. The continuous wake and the absence of point or line singularities in the streamwise direction eliminate many of the numerical problems that are encountered with conventional vortex-lattice and panel methods. Thus, the method is a relatively fast tool for determining the location of the free wake and its interaction with complex wing geometries, especially when accurate load predictions are required.
|Document Type:||Conference or Workshop Item (Paper)|
|Title:||A Free-Wake, Lifting-Surface Model using Distributed Vorticity Elements|
|Keywords:||Higher Order Lifting Surface Method, Free Wake|
|Event Title:||22nd AIAA Applied Aerodynamics Conference, Providence (usa), 16.-19.08.2004|
|HGF - Research field:||Aeronautics, Space and Transport (old)|
|HGF - Program:||Aeronautics|
|HGF - Program Themes:||Aircraft Research|
|DLR - Research area:||Aeronautics|
|DLR - Program:||L AR - Aircraft Research|
|DLR - Research theme (Project):||L - Flight Physics|
|Location:||Köln-Porz , Braunschweig , Göttingen|
|Institutes and Institutions:||Institute of Aerodynamics and Flow Technology|
|Deposited By:||Claudia Grant|
|Deposited On:||31 Jan 2006|
|Last Modified:||14 Jan 2010 19:43|
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