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arXiv 2201.03978math.NAcs.NA
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Navier斯托克斯方程的双重自适应罚方法

A Doubly Adaptive Penalty Method for the Navier Stokes Equations

Kiera Kean, Xihui Xie, Shuxian Xu

摘要:

我们开发,分析和测试自适应罚参数方法。我们证明了速度的无条件稳定性时,适应的罚参数,$ε,$和稳定的速度时间导数的条件下的罚参数参数,$ε(t_{n+1})-ε(t_n)$的变化。分析和测试表明,根据$\nabla\cdot u(t_n)$调整$ε(t_{n+1})$消除了拾取$ε$的问题,并产生了对速度的良好近似。我们提供了误差分析和数值试验来支持这些结果。我们补充自适应$ε$方法也适应时间步长。罚参数$ε$和时间步长独立地自适应。我们进一步比较了一阶、二阶和变阶时间步长算法。压力的准确恢复仍然是一个悬而未决的问题。

英文摘要:

We develop, analyze and test adaptive penalty parameter methods. We prove unconditional stability for velocity when adapting the penalty parameter, $ε,$ and stability of the velocity time derivative under a condition on the change of the penalty parameter, $ε(t_{n+1})-ε(t_n)$. The analysis and tests show that adapting $ε(t_{n+1})$ in response to $\nabla\cdot u(t_n)$ removes the problem of picking $ε$ and yields good approximations for the velocity. We provide error analysis and numerical tests to support these results. We supplement the adaptive-$ε$ method by also adapting the time-step. The penalty parameter $ε$ and time-step are adapted independently. We further compare first, second and variable order time-step algorithms. Accurate recovery of pressure remains an open problem.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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