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arXiv 1303.1964math.NAcs.NA
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粗糙数据下对流主导输运问题的弱范数鲁棒误差估计

Robust error estimates in weak norms for advection dominated transport problems with rough data

University College London(伦敦大学学院)

Erik Burman

AI总结:

针对具有多尺度速度场和粗糙数据的瞬态对流扩散方程,采用对称稳定有限元法,利用对流速度的多尺度分解导出后验和先验误差估计,所有估计均独立于Péclet数和精确解的正则性。

摘要:

我们考虑以瞬态对流-扩散方程形式出现的混合问题,其中速度向量场具有多尺度特征和粗糙数据。我们假设速度场有两个尺度:一个具有缓慢空间变化的粗尺度,负责对流传输;另一个具有小振幅的细尺度,有助于混合。对于这个问题,我们考虑使用对称稳定有限元法计算的解的滤波误差量的估计。利用对流速度的多尺度分解来提高稳定性,导出了后验误差估计和先验误差估计。所有估计均独立于Péclet数和精确解的正则性。

英文摘要:

We consider mixing problems in the form of transient convection--diffusion equations with a velocity vector field with multiscale character and rough data. We assume that the velocity field has two scales, a coarse scale with slow spatial variation, which is responsible for advective transport and a fine scale with small amplitude that contributes to the mixing. For this problem we consider the estimation of filtered error quantities for solutions computed using a finite element method with symmetric stabilization. A posteriori error estimates and a priori error estimates are derived using the multiscale decomposition of the advective velocity to improve stability. All estimates are independent both of the Péclet number and of the regularity of the exact solution.

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