An accurate and efficient gridless method is presented for calculation of unsteady flows at low and high reduced frequencies. A central gridless scheme is applied to solve unsteady flow equations in the arbitrary Lagrangian-Eulerian formulation. Taylor series least squares are used to discretize spatial derivatives at each node. Constrained weights optimization is proposed using a blend of second and fourth differences artificial dissipation terms. The proposed scheme leads to a faster gridless method with simple formulations and a reduction in flux computations. For time advancement, explicit and implicit dual-time methods are used. The segment spring analogy is applied to control/treat smoothness of the dynamic clouds and nodes movement. The capability and accuracy of the method are examined by comparing results of a multielement airfoil in steady flows and some test cases in unsteady flows with those from a finite-volume method and experimental data for low angles of attack at the prestall region. Results show a good agreement with the experimental data. Moreover, it is shown that the constraint weights optimization on the fast gridless method increases the efficiency and accuracy of the approach.


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    Titel :

    Efficient Gridless Method Using Constrained Weights Optimization for Two-Dimensional Unsteady Inviscid Flows at Low Angles of Attack


    Beteiligte:
    Hashemabadi, M. (Autor:in) / Hadidoolabi, M. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    2017-06-13




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Unbekannt