Efficient r-adaptive isogeometric analysis with Winslow's mapping and monitor function approach

Efficient r-adaptive isogeometric analysis with Winslow's mapping and monitor function approach
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使用 Winslow 映射和监控函数方法进行高效的 r 自适应等几何分析

DOI:
10.1016/j.cam.2018.11.003
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发表时间:
2019-05
影响因子:
2.4
通讯作者:
Khajah Tahsin
Khajah Tahsin
中科院分区:
数学2区
文献类型:
--
作者:
Xu Gang;Li Bojian;Shu Laixin;Chen Long;Xu Jinlan;Khajah Tahsin

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受传统有限元分析中的移动网格方法的启发,本文提出了一种基于温斯洛映射和监控函数的r-自适应等几何分析框架。基于等几何解曲面的绝对曲率度量,构造了一个新的监控函数。在建议的r-自适应框架中,内部控制点的重新分配被执行,以增加在基于曲率或基于误差的监控功能是最大的区域中的控制点的密度。采用等几何配点法求解控制偏微分方程,得到新的内部控制点位置,该方法在求解大规模问题时更为有效。通过采用温斯洛的映射,我们确保所产生的r-自适应参数化是有效的等几何分析,并可以作为最佳的初始网格为后续的h-细化。多个二维热传导算例的求解验证了所提方法的有效性。
Motivated by the moving mesh method in conventional finite element analysis, in this paper, we propose an r-adaptive isogeometric analysis framework by Winslow’s mapping and monitor function approach. We construct a new monitor function based on the absolute curvature metric of the isogeometric solution surface. In the proposed r-adaptive framework, the redistribution of the inner control points is performed to increase the density of control points in the regions where curvature based or error based monitor functions are maximum. The new locations of the inner control points are obtained by solving governing PDEs using isogeometric collocation method which is more efficient in solving large-scale problems. By employing Winslow’s mapping we ensure that the generated r-adaptive parameterization is valid for isogeometric analysis and can be used as optimal initial grid for subsequent h-refinements. Multiple two-dimensional heat conduction examples are solved which confirm the effectiveness of the proposed method.
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