The authors present an analysis and a numerical method for predicting the response of a two-dimensional sail in unsteady flow. The fluid is considered inviscid and incompressible so that the perturbation of the uniform inflow can be treated within vortex sheet theory. Due to the very small thickness of the sail, the assumption of the ideal flexibility can be made, and a nonlinear membrane model is used to solve the dynamics of the sail. Energy considerations on the complete system provide a variational formulation of the flow-structure interaction problem, which can be solved by using the boundary element method and a point vortex approximation of the wake. Numerical simulations for harmonic perturbation of the trailing edge and random inflows exhibit the nonlinear response of the sail.
Unsteady model of sail and flow interaction
Modellsimulation der Wechselwirkung eines Segels mit einer unstetigen Strömung
Journal of Fluids and Structures ; 13 , 1 ; 37-59
1999
23 Seiten, 15 Bilder, 2 Tabellen, 29 Quellen
Article (Journal)
English
Segelschiff , zweidimensionale Strömung , Umströmung , instationäre Strömung , numerisches Verfahren , reibungsfreie Strömung , inkompressible Strömung , Wirbelströmung , mathematisches Modell , Flexibilität , Nichtlinearität , Membran , Rand-Elemente-Methode , dynamisches Verhalten , Variationsrechnung , Aerodynamik , dimensionslose Kennzahl , ebene Bewegung , elastische Schwingung , Rechnersimulation
Influence of Sail Design Parameters on Unsteady Propeller Thrust for Underwater Vehicles
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