arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.06693math.NAcs.NA
收藏

基于时空配准的一维参数化双曲型偏微分方程模型降阶

Space-time registration-based model reduction of parameterized one-dimensional hyperbolic PDEs

Tommaso Taddei, Lei Zhang

摘要:

提出了一种快速可靠求解参数化双曲型偏微分方程的模型降阶方法。由于存在参数相关的冲击波和接触不连续性,这些问题是非常具有挑战性的传统的模型降阶方法的基础上线性逼近空间。所提出的方法的主要成分是(i)一个自适应的空时配准为基础的数据压缩程序,以调整本地功能在一个固定的参考域,(ii)一个空时彼得罗夫-伽辽金(最小残差)制定的映射解决方案的计算,和(iii)超简化程序,以加快在线计算。我们提出了一个Burgers模型问题和浅水模型问题的数值结果,经验证明该方法的潜力。

英文摘要:

We propose a model reduction procedure for rapid and reliable solution of parameterized hyperbolic partial differential equations. Due to the presence of parameter-dependent shock waves and contact discontinuities, these problems are extremely challenging for traditional model reduction approaches based on linear approximation spaces. The main ingredients of the proposed approach are (i) an adaptive space-time registration-based data compression procedure to align local features in a fixed reference domain, (ii) a space-time Petrov-Galerkin (minimum residual) formulation for the computation of the mapped solution, and (iii) a hyper-reduction procedure to speed up online computations. We present numerical results for a Burgers model problem and a shallow water model problem, to empirically demonstrate the potential of the method.

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。

↑