The postlimiter (simple a posteriori slope limiter) is an anti-slope-limiting mechanism to preserve nominal second order in space as much as possible. This technique has been demonstrated to increase resolutions of two-dimensional simulations up to four times in each dimension [Kitamura, K., and Hashimoto, A., “Simple a posteriori Slope Limiter (Post Limiter) for High Resolution and Efficient Flow Computations,” Journal of Computational Physics, Vol. 341, July 2017, pp. 313–340]. This paper extends the postlimiter to three dimensions with an emphasis on ”dirty” (meaning ill-shaped) cells, which arise in practical three-dimensional (3-D) unstructured grids over complex geometries. Gradient accuracy is known to significantly deteriorate on dirty cells, and a slope limiter needs to be applied. However, the original postlimiter does not recognize dirty cells and deactivates a slope limiter. To address this issue, a simple dirty-cell detection method is proposed and incorporated into the postlimiter. The 3-D version of postlimiter (referred to as “postlimiter 3”) is successfully incorporated into fast aerodynamic routine (FaSTAR), a 3-D unstructured grid flow solver is developed at the Japan Aerospace Exploration Agency. Postlimiter 3 can handle general 3-D unstructured grids. Numerical examples support its efficiency, accuracy, robustness, and applicability to a wide spectrum of aerodynamic problems of high engineering importance.


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    Titel :

    Postlimiters and Simple Dirty-Cell Detection for Three-Dimensional Unstructured (Unlimited) Aerodynamic Simulations


    Beteiligte:
    Kitamura, K. (Autor:in) / Aogaki, T. (Autor:in) / Inatomi, A. (Autor:in) / Fukumoto, K. (Autor:in) / Takahama, T. (Autor:in) / Hashimoto, A. (Autor:in)

    Erschienen in:

    AIAA Journal ; 56 , 8 ; 3192-3204


    Erscheinungsdatum :

    2018-07-13


    Format / Umfang :

    13 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch