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arXiv 2302.07472math.NAcs.NA
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一类新的守恒系统线性隐式能量守恒格式

A novel class of linearly implicit energy-preserving schemes for conservative systems

Xicui Li, Bin Wang, Xin Zou

摘要:

考虑一类能量守恒的微分方程d/dt y(t)= R(y(t))y(t)+f(y(t)).这种保守模型出现在量子物理学、工程学和分子动力学中。利用标量辅助变量(SAV)和分裂的思想构造了一类新的能量守恒格式,并将非线性隐格式改进为线性隐格式.能量守恒和误差估计严格推导。基于这些结果,表明新提出的格式具有无条件的能量稳定性,并可以实现与解决一个线性隐式系统的成本。数值实验证实了新格式的这些优良特性。

英文摘要:

We consider a kind of differential equations d/dt y(t) = R(y(t))y(t) + f(y(t)) with energy conservation. Such conservative models appear for instance in quantum physics, engineering and molecular dynamics. A new class of energy-preserving schemes is constructed by the ideas of scalar auxiliary variable (SAV) and splitting, from which the nonlinearly implicit schemes have been improved to be linearly implicit. The energy conservation and error estimates are rigorously derived. Based on these results, it is shown that the new proposed schemes have unconditionally energy stability and can be implemented with a cost of solving a linearly implicit system. Numerical experiments are done to confirm these good features of the new schemes.

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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