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A new off-step high order approximation for the solution of three-space dimensional nonlinear wave equations

机译:三维空间非线性波动方程解的新的阶跃高阶逼近

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摘要

In this paper, we propose a new high accuracy numerical method of O(k~2 + k~2h~2 + h~4) based on off-step discretization for the solution of 3-space dimensional non-linear wave equation of the form u_(tt) = A(x,y,z,r)u_(xx) + B(x,y,z,t)u_(yy) + C(x,y,z,t)u_(zz) + g(x,y,z,t,u,u_x,U_y,u_z,u_t), 0 < x,y,z < 1 ,t > 0 subject to given appropriate initial and Dirichlet boundary conditions, where k > 0 and h > 0 are mesh sizes in time and space directions respectively. We use only seven evaluations of the function g as compared to nine evaluations of the same function discussed in [3,4]. We describe the derivation procedure in details of the algorithm. The proposed numerical algorithm is directly applicable to wave equation in polar coordinates and we do not require any fictitious points to discretize the differential equation. The proposed method when applied to a telegraphic equation is also shown to be unconditionally stable. Comparative numerical results are provided to justify the usefulness of the proposed method.
机译:本文提出了一种基于失步离散化的O(k〜2 + k〜2h〜2 + h〜4)高精度O(k〜2 + k〜2h〜2 + h〜4)数值方法,用于求解三维空间非线性波动方程。形式u_(tt)= A(x,y,z,r)u_(xx)+ B(x,y,z,t)u_(yy)+ C(x,y,z,t)u_(zz) + g(x,y,z,t,u,u_x,U_y,u_z,u_t),0 0在给定适当的初始和Dirichlet边界条件的情况下,其中k> 0和h> 0分别是时间和空间方向的网格大小。与[3,4]中讨论的相同函数的九个评估相比,我们仅使用函数g的七个评估。我们将详细描述算法的推导过程。所提出的数值算法直接适用于极坐标中的波动方程,并且不需要任何虚拟点来离散微分方程。当应用于电报方程时,所提出的方法也被证明是无条件稳定的。提供了比较数值结果以证明该方法的有效性。

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