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arXiv 2501.07547math.NAcs.NAphysics.comp-ph
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用于求解非线性偏微分方程的时空小波方法

Spacetime Wavelet Method for the Solution of Nonlinear Partial Differential Equations

Cody D. Cochran, Karel Matous

AI总结:

本研究提出一种带先验误差估计的高阶时空小波方法,结合新型小波递归算法降低陡峭条件敏感性,并行化求解流程,经Burgers'方程和Sod激波管问题验证,函数及导数均具高阶收敛率。

摘要:

我们提出了一种高阶时空小波方法,用于以用户指定的精度求解非线性偏微分方程。该技术利用带有先验误差估计的小波理论,同时在空间和时间维度上对问题进行离散化。我们还提出了一种新颖的基于小波的递归算法,以降低由陡峭的初始和/或边界条件带来的系统敏感性。所产生的非线性方程组采用Newton-Raphson方法(牛顿-拉夫逊法)求解。我们对切向算子的构建以及代数方程组的求解进行了并行化处理。我们使用非线性Burgers'方程(伯格斯方程)开展了严格的验证研究,并通过Navier-Stokes方程(纳维-斯托克斯方程)求解Sod激波管问题,展示了该方法的应用。该方法的数值结果表明,函数及其空间和时间导数均具有高阶收敛率。我们求解了在空间和时间方向上均存在陡峭梯度的问题,并给出了先验误差估计。

英文摘要:

We propose a high-order spacetime wavelet method for the solution of nonlinear partial differential equations with a user-prescribed accuracy. The technique utilizes wavelet theory with a priori error estimates to discretize the problem in both the spatial and temporal dimensions simultaneously. We also propose a novel wavelet-based recursive algorithm to reduce the system sensitivity stemming from steep initial and/or boundary conditions. The resulting nonlinear equations are solved using the Newton-Raphson method. We parallelize the construction of the tangent operator along with the solution of the system of algebraic equations. We perform rigorous verification studies using the nonlinear Burgers' equation. The application of the method is demonstrated solving Sod shock tube problem using the Navier-Stokes equations. The numerical results of the method reveal high-order convergence rates for the function as well as its spatial and temporal derivatives. We solve problems with steep gradients in both the spatial and temporal directions with a priori error estimates.

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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