A comparison of mortar and Nitsche techniques for linear elasticity

A comparison of mortar and Nitsche techniques for linear elasticity
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砂浆和尼采技术线弹性的比较

DOI:
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发表时间:
2004
期刊:
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通讯作者:
B. Wohlmuth
B. Wohlmuth
中科院分区:
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文献类型:
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作者:
Achim Fritz;S. Hüeber;B. Wohlmuth

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区域分解技术为偏微分方程的数值逼近提供了强有力的工具。本文分析了Lamé算子的Nitsche方法,建立了先验误差估计,并将该方法与利用对偶拉格朗日乘子空间的Mortar方法进行了比较.这两种方法都可以应用于非匹配三角剖分。我们使用多重网格算法来解决代数系统。虽然我们有一个网格依赖的双线性形式,最佳$\mathcal{W}$-循环收敛速度可以得到。线性和二次有限元两种方法的数值结果说明了这些非线性离散技术的性能和灵活性。
Domain decomposition techniques provide powerful tools for the numerical approximation of partial differential equations. In this paper, we analyze the Nitsche method for the Lamé operator, establish a priori error estimates and compare this method with the mortar method using dual Lagrange multiplier spaces. Both methods can be applied to non-matching triangulations. We use a multigrid algorithm to solve the algebraic systems. Although we have a mesh dependent bilinear form, optimal $\mathcal{W}$-cycle convergence rates can be obtained. Numerical results for the two methods with linear and quadratic finite elements illustrate the performance and flexibility of these nonconforming discretization techniques.