A natural norm for the method of characteristics using discontinuous finite elements : 2D and 3D case

A natural norm for the method of characteristics using discontinuous finite elements : 2D and 3D case
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使用不连续有限元的特征方法的自然范数:2D 和 3D 情况

DOI:
10.1051/m2an:1999142
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发表时间:
1999
期刊:
Mathematical Modelling and Numerical Analysis
影响因子:
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通讯作者:
A. Machmoum
A. Machmoum
中科院分区:
--
文献类型:
--
作者:
J. Baranger;A. Machmoum

文献摘要

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我们考虑一阶的数值近似 使用网格 ${\cal T}_h$ 上的不连续有限元,通过伪时间步长 k 的特征方法得出稳态双曲方程 。对于这种方法,我们展示了“自然”规范 || || h,k 我们证明离散变分问题 $P_h^k$ 姿势很好,我们 获得误差估计。我们证明当 k 趋于零时问题 $(P_h^k)$ (分别为 || || h,k 范数) 具有与伽辽金不连续相关的极限问题 ( P h )(分别是 || || h 范数) 方法。这扩展到了我们之前在一维空间中获得的结果的二维和三维空间。
We consider the numerical approximation of a first order stationary hyperbolic equation by the method of characteristics with pseudo time step k using discontinuous finite elements on a mesh ${\cal T}_h$ . For this method, we exhibit a “natural” norm || || h,k for which we show that the discrete variational problem $P_h^k$ is well posed and we obtain an error estimate. We show that when k goes to zero problem $(P_h^k)$ (resp. the || || h,k norm) has as a limit problem ( P h ) (resp. the || || h norm) associated to the Galerkin discontinuous method. This extends to two and three space dimension our previous results obtained in one space dimension.