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Hierarchical Universal Matrices for Sensitivity Analysis by Curvilinear Finite Elements

机译:曲线有限元用于灵敏度分析的分层通用矩阵

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摘要

A new method for calculating the geometric sensitivities of curvilinear finite elements is presented. Approximating the relevant metric tensors by hierarchical orthogonal polynomials enables the sensitivity matrices to be integrated analytically. The resulting numerical method is based on pre-calculated universal matrices and achieves significant savings in computer runtime over conventional techniques based on numerical integration. Moreover, there exists a representation limit for the geometry, i.e., the degree of basis functions fully determines a critical order of the geometry expansion, beyond which the derivatives of the finite-element matrices will remain constant. To validate the suggested approach, a numerical example is presented.
机译:提出了一种计算曲线有限元几何灵敏度的新方法。通过分级正交多项式近似相关度量张量,可以对灵敏度矩阵进行分析集成。所得的数值方法基于预先计算的通用矩阵,并且与基于数值积分的常规技术相比,可显着节省计算机运行时间。此外,存在几何图形的表示限制,即,基函数的程度完全确定了几何图形扩展的临界顺序,超过该范围时,有限元矩阵的导数将保持恒定。为了验证所建​​议的方法,给出了一个数值示例。

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