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arXiv 2109.02075math.NAcs.NA
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交叉扩散系统的非侵入模型降阶

Nonintrusive model order reduction for cross-diffusion systems

Bulent Karasozen, Murat Uzunca, Gulden Mulayim

摘要:

本文研究了参数交叉扩散方程基于张量的非侵入降阶模型。全阶模型(FOM)由常微分方程(ODE)矩阵或张量的形式产生的有限差分离散的微分算子,利用Kronecker结构的优势。矩阵/张量微分方程的时间积分隐式-显式(IMEX)欧拉法。通过对张量形式的时空快拍进行高阶奇异值分解(HOSVD),基于参数值的有限样本集,以两级方法构造约简基,节省了大量的计算和内存.通过约化基与包含约化系数的依赖于参数的核张量的张量积,得到了对任意参数值的非侵入约化逼近.使用径向基函数(RBF)插值计算新参数值的减少的系数。通过二维Schnakenberg和三维Brusselator交叉扩散方程的数值实验说明了所提出方法的有效性。降阶模型比全阶模型具有二阶和三阶的加速因子,可以准确地预测时空模式。

英文摘要:

In this paper, we investigate tensor based nonintrusive reduced-order models (ROMs) for parametric cross-diffusion equations. The full-order model (FOM) consists of ordinary differential equations (ODEs) in matrix or tensor form resulting from finite-difference discretization of the differential operators by taking the advantage of Kronecker structure. The matrix/tensor differential equations are integrated in time with the implicit-explicit (IMEX) Euler method. The reduced bases, relying on a finite sample set of parameter values, are constructed in form of a two-level approach by applying higher-order singular value decomposition (HOSVD) to the space-time snapshots in tensor form, which leads to a large amount of computational and memory savings. The nonintrusive reduced approximations for an arbitrary parameter value are obtained through tensor product of the reduced basis by the parameter dependent core tensor that contains the reduced coefficients. The reduced coefficients for new parameter values are computed using radial basis function (RBF) interpolation. The efficiency of the proposed method is illustrated through numerical experiments for two-dimensional Schnakenberg and three-dimensional Brusselator cross-diffusion equations. The spatiotemporal patterns are accurately predicted by the reduced-order models with speed-up factors of orders two and three over the full-order models.

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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