arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.11787math.NAcs.NA
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脆性断裂相场模拟的加速交错格式

An accelerated staggered scheme for phase-field modeling of brittle fracture

Erlend Storvik, Jakub Wiktor Both, Juan Michael Sargado, Jan Martin Nordbotten, Florin Adrian Radu

摘要:

目前有越来越多的兴趣在开发有效的解决方案相场模拟脆性断裂。该问题的控制方程源于非凸能量泛函的约束最小化,最常用的求解器是交错求解方案。与整体牛顿法相比,这是已知的鲁棒性,然而,交错方案通常需要多次迭代才能收敛,当裂纹正在发展时。我们工作的重点是通过一个方案来加速求解器,该方案依次应用安德森加速和超松弛,根据残差演化来回切换,从而确保下降的趋势。所得到的方案利用安德森加速和超松弛的互补优势,使一个强大的和加速的方法来解决这个问题。新方法作为后处理技术应用于求解器的增量,因此,可以通过对现有软件进行微小修改来实现。此外,结合两种加速方案的成本可以忽略不计。数值算例表明了该方法的有效性和鲁棒性。

英文摘要:

There is currently an increasing interest in developing efficient solvers for phase-field modeling of brittle fracture. The governing equations for this problem originate from a constrained minimization of a non-convex energy functional, and the most commonly used solver is a staggered solution scheme. This is known to be robust compared to the monolithic Newton method, however, the staggered scheme often requires many iterations to converge when cracks are evolving. The focus of our work is to accelerate the solver through a scheme that sequentially applies Anderson acceleration and over-relaxation, switching back and forth depending on the residual evolution, and thereby ensuring a decreasing tendency. The resulting scheme takes advantage of the complementary strengths of Anderson acceleration and over-relaxation to make a robust and accelerating method for this problem. The new method is applied as a post-processing technique to the increments of the solver, hence, the implementation can be done with minor modifications to already available software. Moreover, the cost of combining the two acceleration schemes is negligible. The robustness and efficiency of the method are demonstrated through numerical examples.

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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