Several improvements to the mixed-element USM3D discretization and defect-correction schemes have been made. A new methodology for nonlinear iterations, called the Hierarchical Adaptive Nonlinear Iteration Method, has been developed and implemented. The Hierarchical Adaptive Nonlinear Iteration Method provides two additional hierarchies around a simple and approximate preconditioner of USM3D. The hierarchies are a matrix-free linear solver for the exact linearization of Reynolds-averaged Navier-Stokes equations and a nonlinear control of the solution update. Two variants of the Hierarchical Adaptive Nonlinear Iteration Method are assessed on four benchmark cases, namely, a zero-pressure-gradient flat plate, a bump-in-channel configuration, the NACA 0012 airfoil, and a NASA Common Research Model configuration. The new methodology provides a convergence acceleration factor of 1.4 to 13 over the preconditioner-alone method representing the baseline solver technology.


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    Titel :

    Improved Convergence and Robustness of USM3D Solutions on Mixed-Element Grids


    Beteiligte:
    Pandya, Mohagna J. (Autor:in) / Diskin, Boris (Autor:in) / Thomas, James L. (Autor:in) / Frink, Neal T. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    2016-06-20



    Medientyp :

    Sonstige


    Format :

    Keine Angabe


    Sprache :

    Englisch




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