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arXiv 2602.12337math.NAcs.NA
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时间稳定性增强且能量稳定的多尺度线性输运方程的动力学低秩近似

Temporal-Stability-Enhanced and Energy-Stable Dynamical Low-Rank Approximation for Multiscale Linear Kinetic Transport Equations

School of Mathematical Sciences, University of Science and Technology of China(中国科学技术大学数学科学学院)

Shun Li, Yan Jiang, Mengping Zhang, Tao Xiong

AI总结:

本文提出了一种多尺度线性输运方程的动力学低秩方法,通过低秩表示和大时间步长稳定性实现计算效率提升,同时保持能量稳定性和渐近行为准确性。

摘要:

本文开发了一种渐近保持的动力学低秩方法,用于多尺度线性输运方程。所提出的方法在扩散极限下无条件稳定,同时保持正确的渐近行为,并通过低秩表示和大时间步长稳定性实现显著的计算成本降低。在离散 ordinates 离散化下引入了一种与离散能量一致的低秩公式,并建立了所得到方案的能量稳定性。数值实验证实了该方法的能量稳定性,并展示了其在不同极限下保持准确性和效率的能力,同时捕捉到正确的渐近极限。

英文摘要:

In this paper, we develop an asymptotic-preserving dynamical low-rank method for the multiscale linear kinetic transport equation. The proposed scheme is unconditionally stable in the diffusive regime while preserving the correct asymptotic behavior, and can achieve significant reductions in computational cost through a low-rank representation and large time step stability. A low-rank formulation consistent with the discrete energy is introduced under the discrete ordinates discretization, and energy stability of the resulting scheme is established. Numerical experiments confirm the energy stability and demonstrate that the method is efficient while maintaining accuracy across different regimes and capturing the correct asymptotic limits.

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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