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arXiv 2512.20109math.NAcs.NAmath-phmath.MP
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一种能量和螺旋度守恒的增强型伽辽金方法用于不可压缩纳维-斯托克斯方程

An energy- and helicity-conserving enriched galerkin method for the incompressible Navier-Stokes equations

Jilin University(吉林大学)

Siyuan Tong, Qilong Zhai, Qian Zhang, Ran Zhang

AI总结:

本文提出了一种能量和螺旋度守恒的增强型伽辽金方法,用于求解不可压缩纳维-斯托克斯方程,通过两种数值方案实现了动能和螺旋度的精确守恒,并验证了方法的稳定性和误差估计。

摘要:

我们开发了一种增强型伽辽金(EG)方法,用于不可压缩纳维-斯托克斯方程,该方法在无粘性极限下同时 conserve 了动能和螺旋度,而无需引入任何额外的投影变量。该方法采用一种增强型伽辽金速度空间,即一种一阶连续伽辽金空间,其通过在网格面上定义的分段常数进行增强,结合分段常数压力。我们提出了两种基于涡旋形式的对流项的数值方案:非线性方案和线性变种。两种方案都精确地保持了离散的螺旋度和动能,且皮卡迭代保持了非线性方案的守恒性质。我们证明了两种方法的守恒性质,并为非线性方案建立了稳定性和严谨的误差估计。数值实验展示了所提线性方案的准确性和守恒性。

英文摘要:

We develop an enriched Galerkin (EG) method for the incompressible Navier-Stokes equations that conserves both kinetic energy and helicity in the inviscid limit without introducing any additional projection variables. The method employs an EG velocity space, which is the first-order continuous Galerkin space enriched with piecewise constants defined on mesh faces, together with piecewise-constant pressure. Two numerical schemes based on the rotational form of the convective term are proposed: a nonlinear scheme and a linear variant. Both schemes exactly preserve the discrete helicity and kinetic energy, and the Picard iteration maintains the conservation properties of the nonlinear scheme. We prove the conservation properties of both the methods, and establish stability and rigorous error estimates for the nonlinear scheme. Numerical examples demonstrate the accuracy and conservation of the proposed linear scheme.

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