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arXiv 1406.0306math.NAcs.NA
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基于独立场近似的快速等几何边界元法

Fast Isogeometric Boundary Element Method based on Independent Field Approximation

Graz University of Technology(格拉茨工业大学);University of Newcastle(纽卡斯尔大学)

Benjamin Marussig, Jürgen Zechner, Gernot Beer, Thomas-Peter Fries

AI总结:

本文提出一种基于独立近似的等几何边界元法,用于弹性问题,实现了灵活的细化策略、高效的几何信息评估、处理非光滑边界间断应力的混合采样方案以及减少方程右边的计算量,且不损失精度。

摘要:

本文提出了一种用于弹性问题的等几何边界元法,其基于几何、应力和位移场的独立近似。这使能够灵活选择细化策略,允许高效评估几何相关信息,采用处理非光滑边界上间断应力的混合采样方案,并显著减少系统方程右边的计算量。所有这些优点在不损失精度的情况下实现。通过使用分层矩阵近似系统矩阵,以降低大规模分析的计算复杂性。为所需的几何划分策略,提出了评估包含NURBS基函数支持的边界框的策略。通过收敛研究和二维、三维实际例子展示了所提方法的通用性和准确性。

英文摘要:

An isogeometric boundary element method for problems in elasticity is presented, which is based on an independent approximation for the geometry, traction and displacement field. This enables a flexible choice of refinement strategies, permits an efficient evaluation of geometry related information, a mixed collocation scheme which deals with discontinuous tractions along non-smooth boundaries and a significant reduction of the right hand side of the system of equations for common boundary conditions. All these benefits are achieved without any loss of accuracy compared to conventional isogeometric formulations. The system matrices are approximated by means of hierarchical matrices to reduce the computational complexity for large scale analysis. For the required geometrical bisection of the domain, a strategy for the evaluation of bounding boxes containing the supports of NURBS basis functions is presented. The versatility and accuracy of the proposed methodology is demonstrated by convergence studies showing optimal rates and real world examples in two and three dimensions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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