The paper presents higher order staggered coupling schemes to couple the calculation of the aerodynamics and structural dynamics of helicopter rotor blades in a modular manner. The continuous interference effects are replaced by discrete influence terms that are exchanged at synchronised instants. Comparisons of calculated loads of the blades with test results demonstrate the capability of the procedure. The time accurate simulation of rotor aeroelasticity is a very challenging interdisciplinary problem. The elastic or articulated blade experiences unsteady air loads of a highly complex, viscous flow field with non-linear transonic regions, dynamic stall, reverse flow and a vortical wake interacting with the blades. As the inflow is asymmetric the blades react with a blade motion that influences the aerodynamic. Thus fluid-structure coupling is mandatory. Accuracy considerations concentrate on two fields: first, staggered time integration schemes that are obligatory for modular coupling, and second, aspects of conservation on either side. Conservation hag to be assured in terms of additional fluxes due to grid deformation, expressed through the geometric conservation law on the aerodynamic side and in terms of energy and momentum conservation when the aerodynamic loads are applied on the structure. It has been shown that close fluid-structure coupling is mandatory to simulate the performance and aeroelasticity of helicopter rotors. The numerical methods could be validated by comparison with experiments. In some areas improvements of the numerical simulation capabilities for such demanding tasks as unsteady helicopter aeroelasticity remain desirable.


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    Title :

    Higher order staggered coupling schemes to predict the aeroelastic behavior of helicopter rotors


    Additional title:

    Versetzte Kopplungsverfahren höherer Ordnung zur Vorhersage des aeroelastischen Verhaltens von Hubschrauberrotoren


    Contributors:
    Wagner, S.N. (author) / Altmikus, A. (author)


    Publication date :

    2003


    Size :

    4 Seiten, 4 Bilder, 15 Quellen




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English