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arXiv 1509.04431math.NAcs.NA
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嵌入式不连续伽辽金输运方案与局部限制器

Embedded discontinuous Galerkin transport schemes with localised limiters

Imperial College London(帝国理工学院);Dortmund University of Technology(多特蒙德工业大学)

C. J. Cotter, D. Kuzmin

AI总结:

本文提出一种基于局部限制的嵌入式不连续伽辽金输运方案,用于部分连续有限元空间,通过稳定迎风DG方案和投影回部分连续空间,实现输运方案的稳定性。

摘要:

受用于数值天气预测兼容有限元方法中温度表示的有限元空间启发,我们引入了适用于(部分)连续有限元空间的局部有界输运方案。高阶输运方案通过将部分连续场注入嵌入不连续有限元空间,应用稳定迎风不连续伽辽金(DG)方案,并投影回部分连续空间;我们称之为嵌入DG方案。我们证明该方案在L2空间下稳定,前提是底层迎风DG方案稳定。然后我们提供了一个应用于嵌入DG输运方案的限制器框架。标准DG限制器应用于底层DG方案。我们引入了一种新的基于元素的局部化通量校正形式,用于限制投影回部分连续空间,使整个输运方案保持有界。我们详细讨论了在楔形元素上张量积有限元空间的具体情况,这些元素在水平方向为不连续P1/Q1,在垂直方向为连续P2。该框架通过数值测试进行了说明。

英文摘要:

Motivated by finite element spaces used for representation of temperature in the compatible finite element approach for numerical weather prediction, we introduce locally bounded transport schemes for (partially-)continuous finite element spaces. The underlying high-order transport scheme is constructed by injecting the partially-continuous field into an embedding discontinuous finite element space, applying a stable upwind discontinuous Galerkin (DG) scheme, and projecting back into the partially-continuous space; we call this an embedded DG scheme. We prove that this scheme is stable in L2 provided that the underlying upwind DG scheme is. We then provide a framework for applying limiters for embedded DG transport schemes. Standard DG limiters are applied during the underlying DG scheme. We introduce a new localised form of element-based flux-correction which we apply to limiting the projection back into the partially-continuous space, so that the whole transport scheme is bounded. We provide details in the specific case of tensor-product finite element spaces on wedge elements that are discontinuous P1/Q1 in the horizontal and continuous P2 in the vertical. The framework is illustrated with numerical tests.

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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