arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2202.08248math.NAcs.NA
收藏

计算三维流体拓扑多解的预条件子optimization

Preconditioners for computing multiple solutions in three-dimensional fluid topology optimization

Ioannis P. A. Papadopoulos, Patrick E. Farrell

摘要:

拓扑最优化问题通常支持多个局部最小值,并且现实世界的应用通常是三维的。在以前的工作[一。P. A. Papadopoulos,P. E. Farrell和T. M. Surowiec,Computing multiple solutions of topology最优化问题,SIAM Journal on Scientific Computing,(2021)],作者开发了放气屏障方法,这是一种可以系统地计算拓扑最优化问题的多个解的算法。在这项工作中,我们开发的预条件的线性系中产生的应用这种方法的斯托克斯流,使其实际用于三维。特别是,我们开发了一个嵌套块预处理的方法,减少了线性系解决两个对称的正定矩阵和增广的动量块。一个增广拉格朗日项被用来控制最里面的舒尔补,我们应用几何多重网格方法与核捕获松弛法的增广动量块。我们提出了多个解决方案,在三维的例子计算使用建议的迭代求解器。

英文摘要:

Topology optimization problems generally support multiple local minima, and real-world applications are typically three-dimensional. In previous work [I. P. A. Papadopoulos, P. E. Farrell, and T. M. Surowiec, Computing multiple solutions of topology optimization problems, SIAM Journal on Scientific Computing, (2021)], the authors developed the deflated barrier method, an algorithm that can systematically compute multiple solutions of topology optimization problems. In this work we develop preconditioners for the linear systems arising in the application of this method to Stokes flow, making it practical for use in three dimensions. In particular, we develop a nested block preconditioning approach which reduces the linear systems to solving two symmetric positive-definite matrices and an augmented momentum block. An augmented Lagrangian term is used to control the innermost Schur complement and we apply a geometric multigrid method with a kernel-capturing relaxation method for the augmented momentum block. We present multiple solutions in three-dimensional examples computed using the proposed iterative solver.

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。

↑