arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0810.4101math.NAcs.NA
收藏

关于半线性抛物型方程指数方法的实现

On the implementation of exponential methods for semilinear parabolic equations

Universidad Autónoma de Madrid(马德里自治大学)

Maria Lopez-Fernandez

AI总结:

针对半线性抛物型方程的时间积分,提出一种基于扇形拉普拉斯变换数值反演的指数方法实现算法,其算子求值误差为O(e^{-cK/ln K}),标量映射求值误差为O(e^{-cK})。

摘要:

考虑通过不同类型的指数方法对半线性抛物型问题进行时间积分。提出了一种实现这些方法的新算法。该算法通过一个收敛速度为$O(e^{-cK/\ln K})$的求积公式来评估指数方法所需的算子,其中$K$是求积节点数。该算法还允许评估相关的标量映射,在这种情况下,求积收敛速度为$O(e^{-cK})$。该技术基于扇形拉普拉斯变换的数值反演。提供了几个数值示例来测试该算法。

英文摘要:

The time integration of semilinear parabolic problems by exponential methods of different kinds is considered. A new algorithm for the implementation of these methods is proposed. The algorithm evaluates the operators required by the exponential methods by means of a quadrature formula that converges like $O(e^{-cK/\ln K})$, with $K$ the number of quadrature nodes. The algorithm allows also the evaluation of the associated scalar mappings and in this case the quadrature converges like $O(e^{-cK})$. The technique is based on the numerical inversion of sectorial Laplace transforms. Several numerical illustrations are provided to test the algorithm.

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。

↑