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arXiv 2312.05511math.NAcs.NA
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瞬态 Stokes 问题 BDF 1-6 时间步进方法的误差分析:速度与压力估计

Error analysis of BDF 1-6 time-stepping methods for the transient Stokes problem: velocity and pressure estimates

Alessandro Contri, Balázs Kovács, André Massing

AI总结:

本文利用 Dahlquist G-稳定性与乘子技术,为瞬态 Stokes 方程的 1–6 阶 BDF 全离散 Galerkin 格式建立速度和压力的统一最优稳定性及误差估计。

摘要:

我们针对瞬态 Stokes 方程的全离散近似格式,提出了一种新的稳定性与误差分析。在空间离散方面,我们考虑一大类 Galerkin 有限元方法,既包括 inf-sup 稳定空间,也包括对称压力稳定格式。我们扩展了 Burman 和 Fernández [《SIAM J. Numer. Anal.》, 47 (2009), pp. 409-439] 的结果,并对 1 至 6 阶向后差分公式(BDF 方法)给出统一的理论分析。我们方法的主要创新在于使用 Dahlquist 的 G-稳定性概念,并结合 Nevannlina-Odeh 以及近期 Akrivis 等人 [《SIAM J. Numer. Anal.》, 59 (2021), pp. 2449-2472] 引入的乘子技术,以推导速度和压力的最优稳定性与误差估计。当初始数据采用依赖于方法的 Ritz 投影时,可以证明无条件稳定性;而对于任意插值,压力稳定性从属于空间与时间离散之间满足一个温和的逆 CFL 型条件。

英文摘要:

We present a new stability and error analysis of fully discrete approximation schemes for the transient Stokes equation. For the spatial discretization, we consider a wide class of Galerkin finite element methods which includes both inf-sup stable spaces and symmetric pressure stabilized formulations. We extend the results from Burman and Fernández [\textit{SIAM J. Numer. Anal.}, 47 (2009), pp. 409-439] and provide a unified theoretical analysis of backward difference formulae (BDF methods) of order 1 to 6. The main novelty of our approach lies in the use of Dahlquist's G-stability concept together with multiplier techniques introduced by Nevannlina-Odeh and recently by Akrivis et al. [\textit{SIAM J. Numer. Anal.}, 59 (2021), pp. 2449-2472] to derive optimal stability and error estimates for both the velocity and the pressure. When combined with a method dependent Ritz projection for the initial data, unconditional stability can be shown while for arbitrary interpolation, pressure stability is subordinate to the fulfillment of a mild inverse CFL-type condition between space and time discretizations.

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