AbstractAn 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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    Title :

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


    Contributors:

    Published in:

    Publication date :

    2017




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English



    Classification :

    BKL:    55.50 Luftfahrzeugtechnik / 51.40 Werkstoffe für bestimmte Anwendungsgebiete / 55.60 Raumfahrttechnik
    Local classification TIB:    770/7040