arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.05211math.NAcs.NA
收藏

随机抛物型方程动态低秩逼近的投影分裂格式的稳定性

Stability properties of a projector-splitting scheme for dynamical low rank approximation of random parabolic equations

Yoshihito Kazashi, Fabio Nobile, Eva Vidličková

摘要:

考虑随机抛物型方程的动态低秩逼近,提出了一类全离散数值格式。类似于连续DLR近似,我们的计划满足离散变分公式。通过利用这个属性,我们建立我们的计划的稳定性:我们表明,我们的显式和半隐式版本是条件稳定的抛物型CFL条件下,不依赖于DLR解决方案的最小奇异值,而我们的隐格式计划是无条件稳定的。此外,我们表明,在某些情况下,半隐格式可以是无条件稳定的,如果在系统中的随机性是足够小的。此外,我们表明,这些计划可以被解释为投影分裂积分器,并强烈相关的Lubich等人提出的计划。数学,54:171-188,2014; SIAM J.肛门,53:917-941,2015],我们的稳定性分析也适用于此。数值结果表明,所获得的稳定性条件的清晰度的分析支持。

英文摘要:

We consider the Dynamical Low Rank (DLR) approximation of random parabolic equations and propose a class of fully discrete numerical schemes. Similarly to the continuous DLR approximation, our schemes are shown to satisfy a discrete variational formulation. By exploiting this property, we establish stability of our schemes: we show that our explicit and semi-implicit versions are conditionally stable under a parabolic type CFL condition which does not depend on the smallest singular value of the DLR solution; whereas our implicit scheme is unconditionally stable. Moreover, we show that, in certain cases, the semi-implicit scheme can be unconditionally stable if the randomness in the system is sufficiently small. Furthermore, we show that these schemes can be interpreted as projector-splitting integrators and are strongly related to the scheme proposed by Lubich et al. [BIT Num. Math., 54:171-188, 2014; SIAM J. on Num. Anal., 53:917-941, 2015], to which our stability analysis applies as well. The analysis is supported by numerical results showing the sharpness of the obtained stability conditions.

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。

↑