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arXiv 2309.02439math.NAcs.NA
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一种强大的鲁棒三次Hermite配点法用于等宽波方程的数值计算与模拟

A Powerful Robust Cubic Hermite Collocation Method for the Numerical Calculations and Simulations of the Equal Width Wave Equation

Selçuk Kutluay, Nuri Murat Yağmurlu, Ali Sercan Karakaş

AI总结:

本文提出一种结合Crank-Nicolson和三次Hermite配点法的数值方法求解非线性等宽波方程,通过六个测试问题验证其准确性,误差范数和不变量优于多数已有方法,且无条件稳定。

摘要:

本文对非线性等宽波(EW)方程进行了数值求解。为此,首先采用Rubin-Graves型方法对方程中的非线性项进行线性化。然后,为了将方程化为可求解的离散化线性代数方程组(这是本研究的关键部分),分别应用Crank-Nicolson型近似和三次Hermite配点法来获得时间域和空间域方向上的积分。为了说明所提方法的有效性和准确性,考虑了六个测试模型问题,即单孤立波、双孤立波相互作用、三孤立波相互作用、麦克斯韦初始条件、无涌波以及孤子碰撞,并对其进行了求解。由于在这些孤立波中只有单孤立波具有解析解,因此计算了误差范数Linf和L2,并与文献中已有的几项先前工作进行了比较。此外,还计算并给出了所提问题在模拟过程中广泛使用的三个不变量I1、I2和I3,并给出了这些不变量的相对变化。另外,误差范数Linf和L2以及这些不变量的比较清楚地表明,所提方案在使用相同参数的情况下,比大多数先前的工作产生了更好且一致的结果。最后,von Neumann分析表明该方案是无条件稳定的。

英文摘要:

In this article, non-linear Equal Width-Wave (EW) equation will be numerically solved . For this aim, the non-linear term in the equation is firstly linearized by Rubin-Graves type approach. After that, to reduce the equation into a solvable discretized linear algebraic equation system which is the essential part of this study, the Crank-Nicolson type approximation and cubic Hermite collocation method are respectively applied to obtain the integration in the temporal and spatial domain directions. To be able to illustrate the validity and accuracy of the proposed method, six test model problems that is single solitary wave, the interaction of two solitary waves, the interaction of three solitary waves, the Maxwellian initial condition, undular bore and finally soliton collision will be taken into consideration and solved. Since only the single solitary wave has an analytical solution among these solitary waves, the error norms Linf and L2 are computed and compared to a few of the previous works available in the literature. Furthermore, the widely used three invariants I1, I2 and I3 of the proposed problems during the simulations are computed and presented. Beside those, the relative changes in those invariants are presented. Also, a comparison of the error norms Linf and L2 and these invariants obviously shows that the proposed scheme produces better and compatible results than most of the previous works using the same parameters. Finally, von Neumann analysis has shown that the present scheme is unconditionally stable.

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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