Multiscale Asymptotic Analysis and Parallel Algorithm of Parabolic Equation in Composite Materials

Multiscale Asymptotic Analysis and Parallel Algorithm of Parabolic Equation in Composite Materials
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复合材料抛物方程的多尺度渐近分析与并行算法

DOI:
10.1155/2014/217869
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发表时间:
2014-04
影响因子:
--
通讯作者:
Gao, Yang
Gao, Yang
中科院分区:
工程技术4区
文献类型:
--
作者:
Wang, Xin;Duan, Xi-Liang;Gao, Yang

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针对周期性复合材料热传导问题,提出了一种高效的多尺度并行数值算法。与经典的多尺度渐近展开方法不同,本文首先利用时间上的傅立叶变换得到一组频域复值椭圆问题。给出了多尺度渐近分析,并在频域中得到了多尺度渐近解,基本上无需数据通信即可并行求解。然后,逆傅立叶变换将恢复时域中的近似解。收敛结果成立。最后,提出了一种新的并行多尺度有限元算法,并给出了数值算例。
An efficient parallel multiscale numerical algorithm is proposed for a parabolic equation with rapidly oscillating coefficients representing heat conduction in composite material with periodic configuration. Instead of following the classical multiscale asymptotic expansion method, the Fourier transform in time is first applied to obtain a set of complex-valued elliptic problems in frequency domain. The multiscale asymptotic analysis is presented and multiscale asymptotic solutions are obtained in frequency domain which can be solved in parallel essentially without data communications. The inverse Fourier transform will then recover the approximate solution in time domain. Convergence result is established. Finally, a novel parallel multiscale FEM algorithm is proposed and some numerical examples are reported.
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