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arXiv 1602.03641math.NAcs.CEcs.NAmath.AP
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离散裂隙网络中混合维Darcy流和输运的并行顶点近似梯度离散化

Parallel Vertex Approximate Gradient discretization of hybrid dimensional Darcy flow and transport in discrete fracture networks

Feng Xing, Roland Masson, Simon Lopez

摘要:

本文提出了一种考虑与周围基质物质交换的离散裂隙网络中的流动和输运的并行数值算法。Darcy通量的离散是基于顶点近似梯度有限体积格式,适用于多面体网格和非均匀各向异性介质,和输运方程离散的一阶迎风格式结合欧拉显式积分的时间。的并行化是基于SPMD(单程序,多数据)的范例,并依赖于一个分布的网格上的进程与一层鬼细胞,以便允许本地组装的离散系统。达西流的线性系使用PETSc和Trilinos库中实现的不同线性求解器和预处理器求解。该方案的收敛性验证了两个原始的解析解与一个和四个相交的裂缝。然后,该算法的并行效率进行了评估,多达512个进程与不同类型的网格,不同的基质裂缝渗透率比,和不同程度的复杂性的裂缝网络。

英文摘要:

This paper proposes a parallel numerical algorithm to simulate the flow and the transport in a discrete fracture network taking into account the mass exchanges with the surrounding matrix. The discretization of the Darcy fluxes is based on the Vertex Approximate Gradient finite volume scheme adapted to polyhedral meshes and to heterogeneous anisotropic media, and the transport equation is discretized by a first order upwind scheme combined with an Euler explicit integration in time. The parallelization is based on the SPMD (Single Program, Multiple Data) paradigm and relies on a distribution of the mesh on the processes with one layer of ghost cells in order to allow for a local assembly of the discrete systems. The linear system for the Darcy flow is solved using different linear solvers and preconditioners implemented in the PETSc and Trilinos libraries. The convergence of the scheme is validated on two original analytical solutions with one and four intersecting fractures. Then, the parallel efficiency of the algorithm is assessed on up to 512 processes with different types of meshes, different matrix fracture permeability ratios, and different levels of complexity of the fracture network.

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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