arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2308.03497math.NAcs.NA
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带Dirichlet边界条件的Navier-Stokes-Fourier系统的惩罚方法:收敛性与误差估计

Penalty method for the Navier-Stokes-Fourier system with Dirichlet boundary conditions: convergence and error estimates

Maria Lukacova-Medvidova, Bangwei She, Yuhuan Yuan

AI总结:

本文针对带Dirichlet边界条件的可压缩Navier-Stokes-Fourier系统,提出将流体区域嵌入立方体域的惩罚有限体积法,证明数值解弱收敛到耗散测度值解,并在强解存在时获得1/4至最优1/2速率的强收敛结果。

摘要:

我们研究带Dirichlet边界条件的可压缩Navier-Stokes-Fourier系统的有限体积法的收敛性与误差估计。物理流体区域通常是光滑的,需要用多边形计算区域来近似。这会导致与区域相关的离散化误差,即所谓的变分犯罪。为了有效处理这些误差,我们将流体区域嵌入到一个足够大的立方体区域中,并针对相应的区域惩罚问题提出一种有限体积格式。在数值密度和温度一致有界的假设下,我们推导出弹道能量不等式,从而得到先验估计以及惩罚有限体积逼近的一致性。进一步,我们证明数值解弱收敛到相应Dirichlet问题的一个广义解,即所谓的耗散测度值解。如果存在强解,我们证明我们的数值逼近以1/4的速率强收敛。此外,在假设近似速度一致有界的情况下,我们得到强解的全局存在性。在这种情况下,我们证明数值解以最优速率1/2强收敛到强解。

英文摘要:

We study the convergence and error estimates of a finite volume method for the compressible Navier-Stokes-Fourier system with Dirichlet boundary conditions. Physical fluid domain is typically smooth and needs to be approximated by a polygonal computational domain. This leads to domain-related discretization errors, the so-called variational crimes. To treat them efficiently we embed the fluid domain into a large enough cubed domain, and propose a finite volume scheme for the corresponding domain-penalized problem. Under the assumption that the numerical density and temperature are uniformly bounded, we derive the ballistic energy inequality, yielding a priori estimates and the consistency of the penalization finite volume approximations. Further, we show that the numerical solutions converge weakly to a generalized, the so-called dissipative measure-valued, solution of the corresponding Dirichlet problem. If a strong solution exists, we prove that our numerical approximations converge strongly with the rate 1/4. Additionally, assuming uniform boundedness of the approximate velocities, we obtain global existence of the strong solution. In this case we prove that the numerical solutions converge strongly to the strong solution with the optimal rate 1/2.

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