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arXiv 1303.1996math.NAcs.NA
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二维Navier-Stokes方程稳定化有限元逼近的鲁棒误差估计及其在隐式大涡模拟中的应用

Robust error estimates for stabilized finite element approximations of the two dimensional Navier-Stokes equations with application to implicit large eddy simulation

University College London(伦敦大学学院)

Erik Burman

AI总结:

针对二维Navier-Stokes方程的稳定化有限元逼近,在弱参数化范数下建立了误差估计,证明了常数与雷诺数和精确解的Sobolev范数无关,而是与大涡的最大梯度成指数增长,并通过后验形式推导出鲁棒的先验误差估计。

摘要:

我们考虑二维Navier-Stokes方程的稳定化有限元逼近在弱参数化范数下的误差估计。这些弱范数与某些滤波量的范数相关,其中范数参数与滤波宽度相关。在假设解可分解为大涡和细尺度波动的前提下,证明了估计常数与雷诺数和精确解的Sobolev范数无关,而是与大涡的最大梯度成指数增长。误差估计采用后验形式,但利用有限元空间上的Sobolev嵌入和稳定化算子的性质,残差可以被一致上界化,从而得到鲁棒的先验误差估计。

英文摘要:

We consider error estimates in weak parametrised norms for stabilized finite element approximations of the two-dimensional Navier-Stokes' equations. These weak norms can be related to the norms of certain filtered quantities, where the parameter of the norm, relates to the filter width. Under the assumption of the existence of a certain decomposition of the solution, into large eddies and fine scale fluctuations, the constants of the estimates are proven to be independent of both the Reynolds number and the Sobolev norm of the exact solution. Instead they exhibit exponential growth with a coefficient proportional to the maximum gradient of the large eddies. The error estimates are on a posteriori form, but using Sobolev injections valid on finite element spaces and the properties of the stabilization operators the residuals may be upper bounded uniformly, leading to robust a priori error estimates.

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