arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1908.03087math.NAcs.CEcs.NA
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椭圆问题的二阶面心有限体积法

A second-order face-centred finite volume method for elliptic problems

Luan M Vieira, Matteo Giacomini, Ruben Sevilla, Antonio Huerta

摘要:

提出了一种二阶面心有限体积法。相反,更流行的细胞为中心和顶点为中心的有限体积(FV)技术,所提出的方法定义的解决方案的网格(边缘在两个维度)的面。该方法是基于一个混合配方,因此认为解决方案和它的梯度作为独立的未知数。它们是在确定面处的解决方案之后逐个元素地解决问题来计算的。所提出的方法避免了需要重建的解决方案梯度,所需的细胞为中心和顶点为中心的FV方法。这种策略导致了一种对网格变形和拉伸不敏感的方法。目前的方法是二阶的,需要解决一个全球性的方程组相同的大小和相同数量的非零元素相比,最近提出的一阶FCFV。提出了泊松和斯托克斯问题的制定。数值例子来说明该方法的近似性能,以及展示其在三维问题与复杂的几何形状。在FCFV求解算法中引入了网格自适应算法。

英文摘要:

A second-order face-centred finite volume method (FCFV) is proposed. Contrary to the more popular cell-centred and vertex-centred finite volume (FV) techniques, the proposed method defines the solution on the faces of the mesh (edges in two dimensions). The method is based on a mixed formulation and therefore considers the solution and its gradient as independent unknowns. They are computed solving an element-by-element problem after the solution at the faces is determined. The proposed approach avoids the need of reconstructing the solution gradient, as required by cell-centred and vertex-centred FV methods. This strategy leads to a method that is insensitive to mesh distortion and stretching. The current method is second-order and requires the solution of a global system of equations of identical size and identical number of non-zero elements when compared to the recently proposed first-order FCFV. The formulation is presented for Poisson and Stokes problems. Numerical examples are used to illustrate the approximation properties of the method as well as to demonstrate its potential in three dimensional problems with complex geometries. The integration of a mesh adaptive procedure in the FCFV solution algorithm is also presented.

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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