arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2403.07712math.APcs.NAmath.NA
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带无散方程松弛项的非局部Stokes方程

Nonlocal Stokes equation with relaxation on the divergence free equation

Yajie Zhang, Qiang Du, Zuoqiang Shi

AI总结:

本文提出带松弛项的非局部Stokes系统,证明其适定性并验证二阶收敛于局部Stokes系统,为不可压缩流数值方法提供理论支撑。

摘要:

本文研究了二维和三维空间中带周期边界条件的线性Stokes系统的一种新型非局部逼近方法。我们在非局部无散方程中加入了一个松弛项,这一思路类似于带小人工可压缩性的局部Stokes方程的松弛方法。分析表明,在对非局部相互作用核施加一些温和假设的条件下,可以证明该非局部系统的适定性。此外,当非局部相互作用的视界参数趋于零时,这一新的非局部系统以二阶精度收敛于传统的局部Stokes系统。本研究为模拟不可压缩粘性流的一些数值方法(如smoothed particle hydrodynamics(光滑粒子流体动力学))提供了更多理论理解。

英文摘要:

In this paper, we consider a new nonlocal approximation to the linear Stokes system with periodic boundary conditions in two and three dimensional spaces . A relaxation term is added to the equation of nonlocal divergence free equation, which is reminiscent to the relaxation of local Stokes equation with small artificial compressibility. Our analysis shows that the well-posedness of the nonlocal system can be established under some mild assumptions on the kernel of nonlocal interactions. Furthermore, the new nonlocal system converges to the conventional, local Stokes system in second order as the horizon parameter of the nonlocal interaction goes to zero. The study provides more theoretical understanding to some numerical methods, such as smoothed particle hydrodynamics, for simulating incompressible viscous flows.

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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