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首页> 外文期刊>Journal of Computational Physics >A robust S _N-DG-approximation for radiation transport in optically thick and diffusive regimes
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A robust S _N-DG-approximation for radiation transport in optically thick and diffusive regimes

机译:鲁棒的S _N-DG逼近,用于在光学厚度和扩散状态下的辐射传输

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摘要

We introduce a new discontinuous Galerkin (DG) method with reduced upwind stabilization for the linear Boltzmann equation applied to particle transport. The asymptotic analysis demonstrates that the new formulation does not suffer from the limitations of standard upwind methods in the thick diffusive regime; in particular, the new method yields the correct diffusion limit for any approximation order, including piecewise constant discontinuous finite elements. Numerical tests on well-established benchmark problems demonstrate the superiority of the new method. The improvement is particularly significant when employing piecewise constant DG approximation for which standard upwinding is known to perform poorly in the thick diffusion limit.
机译:对于引入粒子传输的线性玻尔兹曼方程,我们引入了一种新的不连续伽勒金(DG)方法,该方法具有减小的迎风稳定性。渐近分析表明,新配方在厚扩散状态下不受标准迎风方法的限制。尤其是,该新方法可针对任何近似阶数(包括分段常量不连续有限元)产生正确的扩散极限。对公认的基准问题的数值测试证明了该新方法的优越性。当采用分段常数DG逼近时,该改进尤为重要,已知分段增量DG逼近在厚扩散极限中标准上绕效果不佳。

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