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arXiv 1607.07683math.NAcs.NA
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受限扩散-反应系统的分裂方法

Splitting methods for constrained diffusion-reaction systems

Technische Universität Berlin(柏林工业大学);University of Innsbruck(因斯布鲁克大学)

Robert Altmann, Alexander Ostermann

AI总结:

本文研究了受限偏微分方程的时间积分中的李分裂和斯特朗分裂方法,通过分离非线性项提高计算效率,并通过修正项解决顺序降低问题。

摘要:

我们考虑了受限偏微分方程中带有非线性反应项的时间积分中的李和斯特朗分裂方法。由于此类系统对扰动敏感,分裂过程似乎很有前景,因为我们能够单独处理非线性。这在计算上有优势,因为只需要求解一个线性受限系统和一个非线性ODE。然而,斯特朗分裂由于顺序降低而限制了效率。这是由于非线性子系统为受限子系统产生不一致的初始值。通过引入额外的修正项可以解决这个问题,而不会增加计算成本。数值例子包括耦合机械系统,展示了证明的收敛结果。

英文摘要:

We consider Lie and Strang splitting for the time integration of constrained partial differential equations with a nonlinear reaction term. Since such systems are known to be sensitive with respect to perturbations, the splitting procedure seems promising as we can treat the nonlinearity separately. This has some computational advantages, since we only have to solve a linear constrained system and a nonlinear ODE. However, Strang splitting suffers from order reduction which limits its efficiency. This is caused by the fact that the nonlinear subsystem produces inconsistent initial values for the constrained subsystem. The incorporation of an additional correction term resolves this problem without increasing the computational cost. Numerical examples including a coupled mechanical system illustrate the proven convergence results.

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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