修正:具有分部求和性质的高阶人工耗散算子

D. C. Penner, D. Zingg
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引用次数: 0

摘要

分部求和(SBP)的性质可用于构造高阶可证明稳定的数值方法。本文探索了一个通用框架,用于推导可证明的稳定和保守的人工耗散算子,用于一般节点分布上的高阶传统和元素型SBP算子,从而实现实际非线性问题的时间稳定和精确解,包括那些包含可变中心的问题,例如,涉及可压缩欧拉和NavierStokes方程的空气动力学问题。提出了标量守恒定律的基本前提,并将其推广到系统的熵稳定性。与传统SBP算子一起使用的人工耗散算子被构造为具有1阶、3阶、5阶和7阶精度的内部,使用最小宽度的模板,在推导新的保持精度的边界闭包方面具有足够的灵活性。在legende - gauss和legende - gauss - lobatto节点分布上构造了单元型耗散算子。在收敛发散喷管的准一维欧拉方程数值解中,研究了所构造的一组人工耗散算子的稳定性和精度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Correction: High-Order Artificial Dissipation Operators Possessing the Summation-By-Parts Property
The summation-by-parts (SBP) property can be used to construct high-order provably stable numerical methods. A general framework is explored for deriving provably stable and conservative artificial dissipation operators for use with high-order traditional and elementtype SBP operators on general nodal distributions, thus enabling the time stable and accurate solution of practical nonlinear problems, including those problems that contain variable coe cients, for example, aerodynamics problems involving the compressible Euler and NavierStokes equations. The basic premise is presented for scalar conservation laws and then extended to entropy stability for systems. Artificial dissipation operators for use with traditional SBP operators are constructed having 1st, 3rd, 5th, and 7th order accuracy on the interior achieved with minimum-width stencils that have ample flexibility in the derivation of novel accuracy-preserving boundary closures. Element-type dissipation operators are constructed on the Legendre-Gauss and Legendre-Gauss-Lobatto nodal distributions. The stability and accuracy properties of a suite of the constructed artificial dissipation operators are characterized in the numerical solution of the quasi-one-dimensional Euler equations applied to a converging-diverging nozzle.
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