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High-Order Strand Grid Methods for Low Mach and Incompressible Flows

机译:低马赫数和不可压缩流的高阶股线网格方法

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A novel high-order finite volume scheme using flux correction methods in conjunction with structured finite difference schemes is extended to low Mach and incompressible flows on strand grids. Flux correction achieves high-order by explicitly canceling low-order truncation error terms in the finite volume cell. The flux correction method is applied in unstructured layers of the strand grid. The layers are then coupled together using a source term containing the derivatives in the strand direction. Strand-direction derivatives are obtained by using summation-by-parts operators for first-and second- derivatives. A preconditioner is used to extend the method to low Mach and incompressible flows. We further extend the method to turbulent flows with the Spalart-Allmaras model. Results of the turbulence model require further investigation, and turbulent results are incomplete at the writing of this paper. We verify high-order accuracy via the method of manufactured solutions. Results obtained for low-Mach and incompressible flows compare well to analytical solutions, numerical studies, and experimental data.
机译:结合通量校正方法和结构化有限差分方案的一种新颖的高阶有限体积方案,被扩展到钢绞线网格上的低马赫数和不可压缩流。通量校正通过显式消除有限体积像元中的低阶截断误差项来实现高阶。通量校正方法适用于钢绞线网格的非结构化层。然后使用包含在导链方向上的导数的源项将这些层耦合在一起。通过使用一阶和二阶导数的按部分求和运算符,可以得到链方向导数。使用预处理器将方法扩展到低马赫数和不可压缩流。我们使用Spalart-Allmaras模型进一步将该方法扩展到湍流。湍流模型的结果需要进一步研究,在撰写本文时,湍流结果还不完整。我们通过制造解决方案的方法来验证高阶精度。低马赫数和不可压缩流量获得的结果与分析解决方案,数值研究和实验数据进行了很好的比较。

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