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arXiv 1607.06240math.NAastro-ph.IMcs.NA
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混合熵稳定的HLL型黎曼求解器用于超几何守恒律

Hybrid Entropy Stable HLL-Type Riemann Solvers for Hyperbolic Conservation Laws

RWTH Aachen University(亚琛工业大学);Universität zu Köln(科隆大学)

Birte Schmidtmann, Andrew R. Winters

AI总结:

本文提出混合HLL型求解器,通过凸组合减少耗散同时保持熵稳定性,验证于理想磁流体力学方程数值实验。

摘要:

已知HLL型方案比特征分解方案更耗散。然而,HLL型方法在处理大系统超几何守恒律时更具灵活性,因为不需要计算通量雅可比矩阵的特征结构。本文证明了几种HLL型黎曼求解器可证明熵稳定。进一步,我们通过凸组合标准耗散项,创建混合HLL型方法,在减少耗散的同时保持熵稳定性。在理想磁流体力学方程中,通过数值实验展示了耗散的减少。

英文摘要:

It is known that HLL-type schemes are more dissipative than schemes based on characteristic decompositions. However, HLL-type methods offer greater flexibility to large systems of hyperbolic conservation laws because the eigenstructure of the flux Jacobian is not needed. We demonstrate in the present work that several HLL-type Riemann solvers are provably entropy stable. Further, we provide convex combinations of standard dissipation terms to create hybrid HLL-type methods that have less dissipation while retaining entropy stability. The decrease in dissipation is demonstrated for the ideal MHD equations with a numerical example.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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