Several improvements to the mixed-elementUSM3Ddiscretization 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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    Title :

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


    Contributors:

    Conference:

    AIAA Aerospace Sciences Meeting ; 2015 ; Kissimmee, FL, United States


    Published in:

    Publication date :

    2016-06-20



    Type of media :

    Conference paper


    Type of material :

    No indication


    Language :

    English




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