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arXiv 1503.05378math.NAcs.NAmath-phmath.MP
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自适应有限元近似不可压缩流体的隐式幂律型流动

Adaptive Finite element approximation of steady flows of incompressible fluids with implicit power-law-like rheology

Ruhr-Universität Bochum(波鸿鲁尔大学);University of Oxford(牛津大学)

Christian Kreuzer, Endre Süli

AI总结:

本文研究了不可压缩流体隐式幂律型流动的自适应有限元近似,通过后验误差分析和适应性算法,证明了弱收敛性。

摘要:

我们开发了隐式幂律型模型粘性不可压缩流体有限元近似的后验误差分析。在所考虑的模型类别中,Cauchy应力和速度梯度对称部分通过一个可能多值的最大单调r-图相关联,其中2d/(d+1)<r<∞。我们建立了有限元残差的上界和下界,以及误差界的地方稳定性。然后考虑了问题的自适应有限元近似,在适当假设下,证明了自适应算法弱收敛于边值问题的弱解。论证基于多种弱紧性技术,包括Chacon的咬合引理和由L.Diening,C.Kreuzer和E.Süli引入的有限元Sobolev函数的Acerbi-Fusco Lipschitz截断。

英文摘要:

We develop the a posteriori error analysis of finite element approximations of implicit power-law-like models for viscous incompressible fluids. The Cauchy stress and the symmetric part of the velocity gradient in the class of models under consideration are related by a, possibly multi--valued, maximal monotone $r$-graph, with $\frac{2d}{d+1}<r<\infty$. We establish upper and lower bounds on the finite element residual, as well as the local stability of the error bound. We then consider an adaptive finite element approximation of the problem, and, under suitable assumptions, we show the weak convergence of the adaptive algorithm to a weak solution of the boundary-value problem. The argument is based on a variety of weak compactness techniques, including Chacon's biting lemma and a finite element counterpart of the Acerbi--Fusco Lipschitz truncation of Sobolev functions, introduced by L. Diening, C. Kreuzer and E. Süli [Finite element approximation of steady flows of incompressible fluids with implicit power-law-like rheology. SIAM J. Numer. Anal., 51(2), 984--1015].

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