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A Free-Wake, Lifting-Surface Model using Distributed Vorticity Elements

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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Abstract

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)
Additional Information: LIDO-Berichtsjahr=2005,
Title:A Free-Wake, Lifting-Surface Model using Distributed Vorticity Elements
Authors:
AuthorsInstitution or Email of Authors
Bramesfeld, G.The Pennsylvania State University
Maughmer, M.D.The Pennsylvania State University
Horstmann, K.H.UNSPECIFIED
Date:2004
Status:Published
Keywords:Higher Order Lifting Surface Method, Free Wake
Event Title:22nd AIAA Applied Aerodynamics Conference, Providence (usa), 16.-19.08.2004
Organizer:AIAA
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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