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A limiter for PPM that preserves accuracy at smooth extrema

机译:PPM的限制器,可在平滑极值时保持准确性

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We present a new limiter for the PPM method of Colella and Woodward [P. Colella, P.R. Woodward, The Piecewise Parabolic Method (PPM) for gas-dynamical simulations, Journal of Computational Physics 54 (1984) 174-201] that preserves accuracy at smooth extrema. It is based on constraining the interpolated values at extrema (and only at extrema) using non-linear combinations of various difference approximations of the second derivatives. Otherwise, we use a standard geometric limiter to preserve monotonicity away from extrema. This leads to a method that has the same accuracy for smooth initial data as the underlying PPM method without limiting, while providing sharp, non-oscillatory representations of discontinuities. (c) 2008 Published by Elsevier Inc.
机译:我们为Colella和Woodward提出了一种PPM方法的新限制器[P. Colella,P.R. Woodward,“分段抛物线法(PPM)用于气体动力学模拟”,《计算物理杂志》 54(1984)174-201]在平滑极值下保持准确性。它基于使用二阶导数的各种差分近似值的非线性组合约束极值处(仅极值处)的插值。否则,我们将使用标准的几何限制器来保持单调性远离极值。这就导致了一种方法,该方法对于平滑的初始数据具有与基础PPM方法相同的精度,而没有限制,同时提供了不连续的清晰,非振荡表示。 (c)2008年由Elsevier Inc.发布。

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