arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1606.04588math.NAcs.NA
收藏

Bernstein 模态基:用于分数偏微分方程的谱 Petrov-Galerkin 方法的应用

Bernstein modal basis: application to the spectral Petrov-Galerkin method for fractional partial differential equations

Department of Mathematics, Faculty of Mathematical Sciences and Computer, Kharazmi University(卡扎维米大学数学与计算机科学学院)

Mostafa Jani, Esmail Babolian, Shahnam Javadi

AI总结:

本文提出基于双 Bernstein 多项式的模态基,用于求解具有 Caputo 导数的分数偏微分方程,展示了该方法在处理常系数问题时能产生稀疏带状线性系统,并通过数值实验验证了其效率和谱精度。

摘要:

在谱 Petrov-Galerkin 方法中,试函数和测试函数需要满足特定的边界条件。通过适当线性组合正交多项式,可以得到称为模态基的基函数。本文将此思想扩展到非正交的双 Bernstein 多项式。基于双 Bernstein 多项式,推导出模态基函数的紧凑通用公式。然后,本文提出了一种用于求解具有 Caputo 导数的分数偏微分方程类的 Bernstein-谱 Petrov-Galerkin 方法。证明该方法对于常系数问题能产生带状稀疏线性系统。一些数值例子展示了该方法的效率和谱精度。

英文摘要:

In the spectral Petrov-Galerkin methods, the trial and test functions are required to satisfy particular boundary conditions. By a suitable linear combination of orthogonal polynomials, a basis, that is called the modal basis, is obtained. In this paper, we extend this idea to the non-orthogonal dual Bernstein polynomials. A compact general formula is derived for the modal basis functions based on dual Bernstein polynomials. Then, we present a Bernstein-spectral Petrov-Galerkin method for a class of time fractional partial differential equations with Caputo derivative. It is shown that the method leads to banded sparse linear systems for problems with constant coefficient. Some numerical examples are provided to show the efficiency and the spectral accuracy of the method.

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。

↑