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A Nitsche method for wave propagation problems in time domain

机译:时域波传播问题的Nitsche方法

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摘要

We propose a new Nitsche-type approach for the weak enforcement of Dirichlet and Neumann boundary conditions in the context of time-domain wave propagation problems in mixed form. A peculiar feature of the proposed method is that, due to the hyperbolic structure of the problem considered, two penalty parameters are introduced, corresponding to Dirichlet and Neumann conditions, respectively. A stability and convergence estimate is also provided, in the case of a discontinuous-in-time Galerkin space-time integrator. The spatial discretization used is based on a stabilized method with equal order interpolation for all solution components. In principle, however, the proposed methodology is not confined to stabilized methods. We conclude with an extensive set of tests to validate the robustness and accuracy of the proposed approach. (C) 2015 Elsevier B.V. All rights reserved.
机译:对于混合形式的时域波传播问题,我们为Dirichlet和Neumann边界条件的弱执行提出了一种新的Nitsche型方法。所提出方法的一个独特之处在于,由于所考虑问题的双曲结构,引入了两个惩罚参数,分别对应于Dirichlet条件和Neumann条件。在时间上不连续的Galerkin时空积分器的情况下,还提供了稳定性和收敛性估计。使用的空间离散化基于对所有解分量均等插值的稳定化方法。然而,原则上,所提出的方法不限于稳定方法。我们以广泛的测试结束,以验证所提出方法的鲁棒性和准确性。 (C)2015 Elsevier B.V.保留所有权利。

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