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arXiv 2410.06362math.NAcs.NA
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受迫Navier-Stokes方程的长时间稳定SAV-BDF2数值格式

Long-time stable SAV-BDF2 numerical schemes for the forced Navier-Stokes equations

Daozhi Han, Xiaoming Wang

AI总结:

该研究提出带FSAV方法的二阶长时间无条件稳定SAV-BDF2时间推进格式,用于受迫Navier-Stokes方程,可保持系统耗散结构、实现时间一致估计,数值验证其在多维度性能优异。

摘要:

我们提出了一种针对受迫Navier-Stokes方程的新型二阶精度、长时间无条件稳定的时间推进格式。本文引入了全新的受迫标量辅助变量方法(Forced Scalar Auxiliary Variable approach, FSAV),用于保持受迫系统的内在耗散结构,从而得到数值解的时间一致估计。此外,若底层模型本身是自治的,该数值格式也具有自治性,为通过动力系统方法研究数值解的长时间动力学行为奠定了基础。作为示例,我们将新算法应用于二维不可压缩Navier-Stokes方程。在单连通域上的无穿透与自由滑移边界条件下,除了通用框架保证的$L^2$范数估计外,我们还能推导得到涡量在$H^1$范数下的时间一致估计。数值结果表明,新算法在精度、效率、稳定性与鲁棒性方面均表现优异。

英文摘要:

We propose a novel second-order accurate, long-time unconditionally stable time-marching scheme for the forced Navier-Stokes equations. A new Forced Scalar Auxiliary Variable approach (FSAV) is introduced to preserve the underlying dissipative structure of the forced system that yields a uniform-in-time estimate of the numerical solution. In addition, the numerical scheme is autonomous if the underlying model is, laying the foundation for studying long-time dynamics of the numerical solution via dynamical system approach. As an example we apply the new algorithm to the two-dimensional incompressible Navier-Stokes equations. In the case with no-penetration and free-slip boundary condition on a simply connected domain, we are also able to derive a uniform-in-time estimate of the vorticity in $H^1$ norm in addition to the $L^2$ norm guaranteed by the general framework. Numerical results demonstrate superior performance of the new algorithm in terms of accuracy, efficiency, stability and robustness.

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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