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Construction of approximate C1 bases for isogeometric analysis on two-patch domains
Computer Methods in Applied Mechanics and Engineering ( IF 6.9 ) Pub Date : 2021-07-14 , DOI: 10.1016/j.cma.2021.114017
Pascal Weinmüller 1 , Thomas Takacs 1
Affiliation  

In this paper, we develop and study approximately smooth basis constructions for isogeometric analysis over two-patch domains. One key element of isogeometric analysis is that it allows high order smoothness within one patch. However, for representing complex geometries, a multi-patch construction is needed. In this case, a C0-smooth basis is easy to obtain, whereas C1-smooth isogeometric functions require a special construction. Such spaces are of interest when solving numerically fourth-order PDE problems, such as the biharmonic equation and the Kirchhoff–Love plate or shell formulation, using an isogeometric Galerkin method.

With the construction of so-called analysis-suitable G1 (in short, AS-G1) parametrizations, as introduced in Collin et al. (2016), it is possible to construct C1 isogeometric spaces which possess optimal approximation properties, cf. (Kapl et al., 2019). These geometries need to satisfy certain constraints along the interfaces and additionally require that the regularity r and degree p of the underlying spline space satisfy 1rp2. The problem is that most complex geometries are not AS-G1 geometries. Therefore, we define basis functions for isogeometric spaces by enforcing approximate C1 conditions following the basis construction from Kapl et al. (2017). For this reason, the defined function spaces are not exactly C1 but only approximately.

We study the convergence behavior and define function spaces that converge optimally under h-refinement, by locally introducing functions of higher polynomial degree and lower regularity. The convergence rate is optimal in several numerical tests performed on domains with non-trivial interfaces. While an extension to more general multi-patch domains is possible, we restrict ourselves to the two-patch case and focus on the construction over a single interface.



中文翻译:

构建近似 C1 两面片域等几何分析的基础

在本文中,我们开发和研究了用于两面片域上的等几何分析的近似平滑基构造。等几何分析的一个关键要素是它允许一个补丁内的高阶平滑度。但是,为了表示复杂的几何图形,需要多面片构造。在这种情况下,一个C0- 光滑基很容易获得,而 C1-平滑等几何函数需要特殊的构造。在使用等几何 Galerkin 方法求解数值四阶 PDE 问题(例如双调和方程和 Kirchhoff-Love 板或壳公式)时,此类空间很重要。

随着所谓的分析适合 G1 (简而言之,AS-G1) 参数化,如 Collin 等人介绍的那样。(2016), 可以构建C1具有最佳逼近性质的等几何空间,参见。(Kapl 等人,2019 年)。这些几何形状需要满足沿界面的某些约束,另外还需要规则性 r 和学位 基础样条空间的满足 1r-2. 问题是大多数复杂的几何图形都不是 AS-G1几何形状。因此,我们通过强制近似来定义等几何空间的基函数C1遵循 Kapl 等人的基础构建的条件。(2017)。因此,定义的函数空间并不完全是C1 但只是大约。

我们研究收敛行为并定义在以下条件下最佳收敛的函数空间 H-refinement,通过局部引入更高多项式次数和更低正则性的函数。在具有非平凡界面的域上执行的几个数值测试中,收敛速度是最佳的。虽然扩展到更一般的多补丁域是可能的,但我们将自己限制在两个补丁的情况下,并专注于单个接口上的构建。

更新日期:2021-07-14
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