arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1904.03354math.NAcs.NA
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使用Petrov-Galerkin有限元法对广义正则长波方程进行数值近似

Numerical approximation of the generalized regularized long wave equation using Petrov-Galerkin finite element method

Nevsehir Haci Bektas Veli University(内夫谢希尔海基拜塔什维利大学);University of Dhaka(达卡大学)

Seydi Battal Gazi Karakoc, Samir Kumar Bhowmik

AI总结:

本文研究了使用Petrov-Galerkin有限元法对非线性广义正则长波方程进行数值近似的有效性,通过三个测试问题验证了该方法的精度和稳定性,结果与已有研究相比更为精确有效。

摘要:

广义正则长波(GRLW)方程已被开发用于建模多种物理现象,如等离子体中的离子声波和磁流体动力学波、浅水中的非线性横波以及非线性晶体中的声子包。本文旨在通过Petrov-Galerkin方法开发并分析一种强大的数值方案,其中元素形状函数为三次,加权函数为二次B-样条。所提出的方案用于三个测试问题,包括单个孤立波的传播、两个孤立波的相互作用以及具有Maxwell初始条件的孤子演化。首先建立了方程的变分公式和半离散Galerkin方案。我们估计了这种空间近似的精度。然后对线性化方案进行傅里叶稳定性分析,显示其无条件稳定。为了验证新方案的实用性和鲁棒性,计算了误差范数 $L_{2}$, $L_{\infty }$ 和三个不变量 $I_{1},I_{2}$ 和 $I_{3}$。获得的数值结果与已发表的结果相比,显示出更高的精度和有效性。

英文摘要:

The generalized regularized long wave (GRLW) equation has been developed to model a variety of physical phenomena such as ion-acoustic and magnetohydrodynamic waves in plasma, nonlinear transverse waves in shallow water and phonon packets in nonlinear crystals. This paper aims to develop and analyze a powerful numerical scheme for the nonlinear generalized regularized long wave (GRLW) equation by Petrov--Galerkin method in which the element shape functions are cubic and weight functions are quadratic B-splines. The suggested method is performed to three test problems involving propagation of the single solitary wave, interaction of two solitary waves and evolution of solitons with the Maxwellian initial condition. The variational formulation and semi-discrete Galerkin scheme of the equation are firstly constituted. We estimate accuracy of such a spatial approximation. Then Fourier stability analysis of the linearized scheme shows that it is unconditionally stable. To verify practicality and robustness of the new scheme error norms $L_{2}$, $L_{\infty }$ and three invariants $I_{1},I_{2}$ and $I_{3}$ are calculated. The obtained numerical results are compared with other published results and shown to be precise and effective.

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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