特征值问题的预变换方法(Ⅱ):任意三角形域Laplace特征值的计算分析
PRE-TRANSFORMED METHODS FOR EIGEN-PROBLEMSⅡ:EIGEN-STRUCTURE FOR LAPLACE EIGEN-PROBLEM OVER ARBITRARY TRIANGLES
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文摘
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本文基于三类特殊三角形(等边、等腰直角及(30°,60°,90°)三角形域)Laplace特征函数系的构造,提出任意三角形区域上Laplace特征值的近似公式与算法,给出任意三角形域上所有特征值的逼近公式:λm,n≈π2/24S2(h_1~2(7m~2-12mn+7n~2)+h_2~2(3m~2-4mn+3n~2)-2h_3~2(m~2-4mn+n~2)),(m>n≥1),特别,对于最小特征值λ_(min)=λ_(2,1)≈π~2/S~2 11h_1~2+7h_2~2+6h_3~2/24,其中S是该三角形(h_1≤h_2≤h_3)的面积,可作为数值PDE中三角剖分质量的一种新标准q(T):=3h_3~2/16S~2 11h~1_2+7h~2_2+6h_3~2/24.结合数值计算与符号计算,将这三类三角形的基底综合形成统一的新基底,以反映几何(三条边)对于特征问题的影响,从而提高任意三角形域的求解精度. |
其他语种文摘
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Based on Laplace eigen-structure over three special triangle domains(regular triangle, isoceles triangle and triangle with(30°,60°,90°)),we propose a unified basis to compute all Laplace eigenvalues over an arbitrary triangle with mixed numerical and symbolic computation.And a class of approximate formulas for evaluating all eigenvalues over an arbitrary triangle as λ_(m,n)≈π~2/(24S~2)(h_1~2(7m~2 - 12 mn + 7n~2) + h_2~2(3m~2 - 4mn + 3n~2) - 2h_3~2(m~2 - 4mn + n~2)),Especially,for the smallest eigenvalue λ_(min)≈π~2/S~2,(11h_1~2+7h_2~2+6h_3~2)/24, where S is the area of the triangle with three lengths h_1≤h_2≤h_3.And it can be as a new quality of 2-D triangle grid for 2-nd PDE problems as q(τ):=(3h_3~2)/(16S~2)(11h_1~2+7h_2~2+6h_3~3)/24.To reflect the influence of the three side-lengths on the eigenvalues over an arbitrary triangle, we put the above three basis together and use numerical computation with some symbolic. This hybrid algorithm may a way to raise the accuracy of eigenvalues in computing. |
来源
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计算数学
,2012,34(1):1-24 【核心库】
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关键词
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特征值问题的预变换方法
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Laplace特征值问题
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任意三角形域
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地址
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中国科学院软件研究所并行计算实验室, 北京, 100190
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语种
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中文 |
文献类型
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研究性论文 |
ISSN
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0254-7791 |
学科
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数学 |
基金
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国家自然科学基金
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文献收藏号
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CSCD:4440264
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