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arXiv 2005.07805math.NAcs.NA
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泊松方程的HDG方法的$L^\infty$模误差估计及其在Dirichlet边界控制问题中的应用

$L^\infty$ norm error estimates for HDG methods applied to the Poisson equation with an application to the Dirichlet boundary control problem

Gang Chen, Peter Monk, Yangwen Zhang

摘要:

我们证明了准最优$L^\infty$范数误差估计(对数因子)的泊松问题的解决方案的标准杂交间断Galerkin(HDG)方法。虽然这样的估计可用于协调和混合有限元法,这是第一次证明HDG。证明方法的动机是由已知的混合有限元的$L^\infty$范数估计。我们展示两个应用:第一个是证明边界通量估计的最优收敛速度,第二个是证明Dirichlet边界控制问题的解的数值观测收敛速度是理论上预期的。数值算例表明,所预测的速率在实际中是可行的。

英文摘要:

We prove quasi-optimal $L^\infty$ norm error estimates (up to logarithmic factors) for the solution of Poisson's problem by the standard Hybridizable Discontinuous Galerkin (HDG) method. Although such estimates are available for conforming and mixed finite element methods, this is the first proof for HDG. The method of proof is motivated by known $L^\infty$ norm estimates for mixed finite elements. We show two applications: the first is to prove optimal convergence rates for boundary flux estimates, and the second is to prove that numerically observed convergence rates for the solution of a Dirichlet boundary control problem are to be expected theoretically. Numerical examples show that the predicted rates are seen in practice.

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