Nonreflecting far-field boundary conditions that are consistent with the complete transonic small-disturbance (TSD) equations are derived. They are implemented in a new code for solving the complete TSD equation and are tested for a harmonically oscillating NACA 64A010 airfoil in transonic flow and for a flat-plate airfoil with a pulse in the angle of attack. Using the new boundary conditions on a relatively small grid, solutions for the airfoil that are obtained that agree with large-grid calculations, resulting in a 44 percent savings in computer time. Frequency responses for the flat plate show that most of the disturbances incident on the computational boundaries are absorbed by the boundary conditions.


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    Title :

    Nonreflecting boundary conditions for the complete unsteady transonic small-disturbance equation


    Contributors:

    Published in:

    Publication date :

    1985-02-01



    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English