06 Fakultät Luft- und Raumfahrttechnik und Geodäsie

Permanent URI for this collectionhttps://elib.uni-stuttgart.de/handle/11682/7

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Publication Type: search.filters.UBSTyp.KonferenzbeitragEnd date: 1999

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    An innovative algorithm to accurately solve the Euler equations for rotary wing flow
    (1992) Wagner, Siegfried; Krämer, Ewald
    Due to the ability of Euler methods to treat rotational, nonisentropic flows and also to correctly transport on the rotation embedded in the flow field it is possible to correctly represent the inflow conditions on the blade in the stationary hovering flight of a helicopter, which are significantly influenced by the tip vortices (blade-vortex interaction) of all blades. It is shown that also the very complex starting procedure of a helicopter rotor can be very well described by a simple Euler method that is to say without a wake model. The algorithm based on the procedure is part of category upwind schemes, in which the difference formation orientates to the actual, local flow state that is to say to the typical distrubance expansion direction. Hence, the artificial dissipation required for the numerical stability is included in a natural way adapted to the real flow state over the break-up error of the difference equation and has not to be included from outside. This makes the procedure robust. An implicit solution algorithm is used, where the invertation of the coefficient matrix is carried out by means of a Point-Gauss-Seidel relaxation.
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    Tectonic uplift of the Costa Rica - Panamá arc in the Paleocene time as a consequence of the collision between the Cuban arc and the Bahamas Bank
    (1992) Calvo, Claudio; Bolz, Angela
    The article resumes the sedimentary record in southern Central America from tectonic uplift of the Costa Rica - Panamá arc in the Paleocene time as a consequence of the collision between the Cuban arc and the Bahamas Bank
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    Albian to Campanian explosive island arc volcanism in Costa Rica : a new basis for plate reconstructions of western Caribbean
    (1994) Calvo, Claudio; Bolz, Angela
    In dieser Zusammenfassung werden konkrete Hinweise auf Subduktionsprozesse während der Unterkreide in Südzentralamerika präsentiert. Somit bildete der entsprechende mittelamerikanische Inselbogen seitdem die westliche Grenze der Karibischen Platte.