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Four-point interpolation schemes for convective fluxes approximation

机译:对流通量近似的四点插值方案

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摘要

Two four-point interpolation schemes, FPTOI and FPFOI, have been proposed for approximating convective fluxes. In these new schemes, three points in the upstream direction and one in the downstream direction are used for interpolation. The FPTOI scheme has third-order accuracy and smaller odd truncation error terms (seventh derivative), whereas the FPFOI scheme has fourth-order accuracy and a larger critical cell Peclet number (16/5) compared with the QUICK scheme. In order to assess their capabilities, the two schemes are applied to three test problems, one linear and two nonlinear cases, all involving the simultaneous presence of convective dominance and flow-to-grid skewness. The two new schemes have high-order accuracy and further have demonstrated, in computations of flow cases, the ability to preserve better numerical stability behaviors in comparison with the QUICK scheme.
机译:已经提出了两种四点插值方案FPTOI和FPFOI来近似对流通量。在这些新方案中,将上游方向上的三个点和下游方向上的一个点用于插值。相比于QUICK方案,FPTOI方案具有三阶精度和较小的奇数截断误差项(七阶导数),而FPFOI方案具有四阶精度和较大的临界细胞Peclet数(16/5)。为了评估其能力,将这两种方案应用于三个测试问题,一个是线性情况,两个是非线性情况,都涉及对流优势和流向网格偏度的同时存在。这两种新方案具有高阶精度,并且在计算流动工况时进一步证明了与QUICK方案相比,可以保留更好的数值稳定性行为。

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