Results presented at the Fifth Drag Prediction Workshop using CFL3D, FUN3D, and NSU3D are described. These are calculations on the workshop-provided grids and drag-adapted grids. The NSU3D results have been updated to reflect an improvement to skin-friction calculation on skewed grids. FUN3D results generated after the workshop are included for custom participant-generated grids, as well as a grid from a previous workshop. Uniform grid refinement at the design condition shows a tight grouping in calculated drag, where the variation in the pressure component of drag is larger than the skin-friction component. At this design condition, a fine-grid drag value was predicted with a smaller drag adjoint adapted grid via tetrahedral adaption to a metric and mixed-element subdivision. The buffet study produced a larger variation than the design case, which is attributed to large differences in the predicted side-of-body separation extent. Various modeling and discretization approaches had a strong impact on predicted side-of-body separation. A summary of similar published studies is provided to place these observations in context. This large wing-root separation bubble was not observed in wind-tunnel tests, indicating that more work is necessary in modeling wing-root juncture flows to consistently predict experiments.


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    Title :

    CFL3D, FUN3D, and NSU3D Contributions to the Fifth Drag Prediction Workshop


    Contributors:

    Published in:

    Journal of Aircraft ; 51 , 4 ; 1268-1283


    Publication date :

    2014-07-01




    Type of media :

    Conference paper , Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English





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