分布式并行油藏模拟高效求解器的构建

ESTABLISHMENT OF THE HIGH-EFFICIENCY SOLVER FOR DISTRIBUTED PARALLEL RESERVOIR SIMULATION

在分析、借鉴近年来油藏模拟线性系统求解器研究进展与数值实验的基础上,考虑自有并行模拟器的架构特点,以简洁实用为目的采取两步预处理方法,构建了新的高效求解器。在第一步预处理过程中,把构成雅可比矩阵的累积项和流动项分开考虑,提出了不同于以往的解耦矩阵;在第二步预处理方法的选择上,兼顾了分布式并行的实现便利和处理效率,提出了采用z方向线红黑排序的块高斯-赛德尔法(ZLBGS)迭代求解方案。SPE标准算例和油藏模拟实例测试都显示,新的并行求解器计算效率高于采用ASM+BILU单步预处理的原有求解器,提升了自主并行模拟器的性能。

On the bases of analyzing and referring the recent research advances and numerical experiments of the solver in the linear system of the oil reservoir simulation,considering the infrastructural features of the in-house parallel simulator,a new high-efficiency solver was established for the goal of simplicity and practicality by the use of two-stage preconditioning method. In the process of the first step,the decoupling matrix different from ones accepted widely in the past was proposed by splitting the accumulative item and flux parts of Jacobi matrix; on the choice of the second step preconditioning method,taking the convince and efficiency into account for the distributed parallel simulation,Z-line red / black-ordering block Gauss-Seidel( ZLBGS) iterating method is proposed. The test results from SPE standard modeling and actual field simulation both demonstrate that the computing efficiency by the new parallel solver is higher than the previous one by means of single-step ASM + BILU preconditioner,thus the performances of the in-house parallel simulator have been promoted.