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arXiv 1102.1119math-phcs.NAmath.DGmath.MPmath.NA
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旋转Navier-Stokes方程复杂边界的几何方法与双并行算法

Geometry Method for the Rotating Navier-Stokes Equations With Complex Boundary and the Bi-Parallel Algorithm

College of Science, Xi’an Jiaotong University(西安交通大学理学院)

Kaitai Li, Demin Liu

AI总结:

提出基于微分几何的双并行算法,将三维旋转Navier-Stokes方程分解为膜算子和弯曲算子,在复杂边界上实现二维子问题求解,提高精度并克服边界层效应。

摘要:

本文提出了一种基于微分几何观点的新算法,用于求解具有复杂边界的三维旋转Navier-Stokes方程,称为双并行算法。例如,它可以应用于叶轮中两叶片间的通道流动以及具有复杂几何形状边界的飞机环流。假设$R^3$中的一个区域可以被一系列光滑曲面$\Im_k, k=1,...,M$分解为一系列子区域,称为“流层”。应用微分几何方法,三维Navier-Stokes算子可以分裂为两类算子:曲面$\Im_k$切空间上的“膜算子”和沿横向的“弯曲算子”。弯曲算子用有限差分商逼近,并将三维Navier-Stokes方程限制在界面曲面$\Im_k$上,从而可以沿两个方向(“弯曲”方向和“膜”方向)构造双并行算法。该方法的优点是:(1) 能够提高因复杂边界附近不规则网格导致的近似解的精度;(2) 能够克服边界层的数值影响,是一种良好的边界层数值方法;(3) 只需解决二维子问题,无需解决三维子问题。

英文摘要:

In this paper, a new algorithm based on differential geometry viewpoint to solve the 3D rotating Navier-Stokes equations with complex Boundary is proposed, which is called Bi-parallel algorithm. For xample, it can be applied to passage flow between two blades in impeller and circulation flow through aircrafts with complex geometric shape of boundary. Assume that a domain in $R^3$ can be decomposed into a series sub-domain, which is called "flow layer", by a series smooth surface $\Im_k, k=1,...,M$. Applying differential geometry method, the 3D Navier-Stokes operator can be split into two kind of operator: the "Membrane Operator" on the tangent space at the surface $\Im_k$ and the "Bending Operator" along the transverse direction. The Bending Operators are approximated by the finite different quotients and restricted the 3D Naver-Stokes equations on the interface surface $\Im_k$, a Bi-Parallel algorithm can be constructed along two directors: "Bending" direction and "Membrane" directors. The advantages of the method are that: (1) it can improve the accuracy of approximate solution caused of irregular mesh nearly the complex boundary; (2) it can overcome the numerically effects of boundary layer, whic is a good boundary layer numerical method; (3) it is sufficiency to solve a two dimensional sub-problem without solving 3D sub-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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