一类双曲型方程组的特征结构保持格式
Eigenstructure-preserving scheme for a hyperbolic system
摘要:
一个双曲系统必须有一组线性无关的特征向量和相应的实特征值。然而,在数值模拟中,特征值可能是复杂的,因为截断误差污染了双曲系统的特征多项式。在这里,我们提出了一个保持特征结构的计划,总是产生真正的特征值,即使在离散水平。虽然本征结构是在一个非保守的提法进行了讨论,所提出的计划是局部保守的,由于反对称运营商。
英文摘要:
A hyperbolic system must have a set of linearly independent eigenvectors and corresponding real eigenvalues. In numerical simulations, however, the eigenvalues can be complex because truncation errors pollute a characteristic polynomial of the hyperbolic system. Here we propose an eigenstructure-preserving scheme which always generates the real eigenvalues, even in discrete level. Although the eigenstructure is discussed in a non-conservative formulation, the proposed scheme is locally conservative owing to the skew-symmetric operators.
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