A binary-tree element subdivision method for evaluation of nearly singular domain integrals with continuous or discontinuous kernel

A binary-tree element subdivision method for evaluation of nearly singular domain integrals with continuous or discontinuous kernel
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连续或不连续核的近奇异域积分评估的二叉树元素细分方法

DOI:
10.1016/j.cam.2019.04.027
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发表时间:
2019-12
影响因子:
2.4
通讯作者:
Ju Chuanming
Ju Chuanming
中科院分区:
数学2区
文献类型:
--
作者:
Zhang Jianming;Chi Baotao;Singh Krishna M.;Zhong YuDong;Ju Chuanming

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针对三维边界元法(BEM)中具有连续或不连续核的近似奇异区域积分,提出了一种自适应的、高效的二叉树体元剖分方法。在计算近似奇异积分的常规细分法中,通过简单地将源点与单元的每个顶点连接来得到单元的面片。因此,CSM法所得积分的精度容易受到单元形状和源点位置的影响。相比之下,提出的二叉树细分方法(BTSM)是更方便地实现,可以保证成功的补丁生成在任何情况下,精确计算的近奇异域积分连续或不连续的核。对任意类型的体元和源点的不同相对位置的数值结果表明,所提出的方法的鲁棒性,准确性和效率。
An adaptive and efficient volume element subdivision method using binary tree for evaluation of nearly singular domain integrals with continuous or discontinuous kernel in three-dimensional (3-D) boundary element method (BEM) has been presented. In the Conventional Subdivision Method (CSM) for evaluation of nearly singular integrals, the patches are obtained by simply connecting the source point with each vertex of the element. Thus, the accuracy of the integral obtained with CSM is easily affected by the shape of the element and the location of the source point. In contrast, the proposed Binary-Tree Subdivision Method (BTSM) is more convenient to implement and can guarantee successful patch generation under any circumstances for accurate evaluation of nearly singular domain integrals with continuous or discontinuous kernel. Numerical results for volume elements of arbitrary type with various relative locations of the source point demonstrate robustness, accuracy and efficiency of the proposed method.
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发表时间: 1996-11
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