Local projection stabilized finite element method for Navier-Stokes equations

Local projection stabilized finite element method for Navier-Stokes equations
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纳维-斯托克斯方程的局部投影稳定有限元法

DOI:
10.1007/s10483-010-0513-z
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发表时间:
2010-05
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本文将Matthies,Skrzypacz和TuBiska的结果推广到Navier-Stokes问题。对于定常不可压缩的Navier-Stokes方程,提出了一种局部投影稳定化有限元格式。该格式克服了对流控制,改善了有限的非对称条件。它不仅是一种两级方法,而且还适用于在同一网格上定义的空间对。使用定义在同一网格上的近似空间和投影空间,该方案比其他两级方法产生更紧凑的模板。在同一网格上,除了通过丰富逼近空间来丰富局部投影镇定外,还得到了两类新的逼近空间的局部投影镇定,它们不需要用气泡函数来丰富。基于一种特殊的插值法,给出了稳定性和最优先验误差估计。数值结果与一些基准解和理论分析符合得很好。
This paper extends the results of Matthies, Skrzypacz, and Tubiska for the Oseen problem to the Navier-Stokes problem. For the stationary incompressible Navier-Stokes equations, a local projection stabilized finite element scheme is proposed. The scheme overcomes convection domination and improves the restrictive inf-sup condition. It not only is a two-level approach but also is adaptive for pairs of spaces defined on the same mesh. Using the approximation and projection spaces defined on the same mesh, the scheme leads to much more compact stencils than other two-level approaches. On the same mesh, besides the class of local projection stabilization by enriching the approximation spaces, two new classes of local projection stabilization of the approximation spaces are derived, which do not need to be enriched by bubble functions. Based on a special interpolation, the stability and optimal prior error estimates are shown. Numerical results agree with some benchmark solutions and theoretical analysis very well.
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