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arXiv 1107.6038math.NAcs.NA
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无网格近似方案的收敛性分析

Convergence Analysis of Meshfree Approximation Schemes

California Institute of Technology(加州理工学院);Technische Universität München(慕尼黑工业大学)

Agustin Bompadre, Bernd Schmidt, Michael Ortiz

AI总结:

本文建立了一个分析无网格近似方案的一般框架,并以局部最大熵(LME)方案为例,证明了其在Sobolev空间中的收敛性,收敛阶为h的线性阶。

摘要:

本文关注于建立分析无网格近似方案的一般框架,并以局部最大熵(LME)方案为例进行收敛性分析。我们提供了在Sobolev空间中收敛的条件,这些方案是n-一致的(即精确再现次数小于等于n的多项式),且其基函数具有快速衰减性。LME在局部Sobolev空间中的收敛性作为一般理论的直接应用。分析表明收敛阶是h的线性阶,其中h是点集密度的度量。分析还展示了如何参数化LME方案以实现最优收敛。由于LME的凸逼近性质,其在边界附近的行为是奇异的,需要额外分析。对于多面体域的特殊情况,我们证明在远离边界的小奇异部分,任何Sobolev函数都可以通过LME方案逼近。借助容量论证,我们进一步得到了在H1中截断LME基函数的逼近结果,适用于空间维数d > 2。

英文摘要:

This work is concerned with the formulation of a general framework for the analysis of meshfree approximation schemes and with the convergence analysis of the Local Maximum-Entropy (LME) scheme as a particular example. We provide conditions for the convergence in Sobolev spaces of schemes that are n-consistent, in the sense of exactly reproducing polynomials of degree less or equal to n, and whose basis functions are of rapid decay. The convergence of the LME in a locally Sobolev space follows as a direct application of the general theory. The analysis shows that the convergence order is linear in h, a measure of the density of the point set. The analysis also shows how to parameterize the LME scheme for optimal convergence. Because of the convex approximation property of LME, its behavior near the boundary is singular and requires additional analysis. For the particular case of polyhedral domains we show that, away from a small singular part of the boundary, any Sobolev function can be approximated by means of the LME scheme. With the aid of a capacity argument, we further obtain approximation results with truncated LME basis functions in H1 and for spatial dimension d > 2.

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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