解非均匀区域油藏模拟问题的一种有效并行计算方法

运用区域分解方法求解油藏模拟问题,结合灵活的区域划分和负载平衡策略,可以提高解题速度.但一般区域分解方法在应用中存在算法收敛慢,计算量增加,虽有一定加速比,但提高不大.特别是对非均匀区域的应用问题,子区域收敛速度不同引起的负载不均衡进一步导致性能下降.本文基于分布式并行系统,运用整体预处理改进区域分解方法,降低了非均匀油藏模拟问题的计算复杂性,提高了模拟计算的速度,并根据全局和本地负载状态调整区域划分,结合有效的负载平衡策略,达到对一类黑油模型油藏模拟问题高效的并行求解.实验结果表明,模拟速度有较大提高,并取得较高加速比.

Valid Parallel Algorithm for Nonuniform Domain Simulation of Reservoir

The domain decomposition method,when combined with flexible decomposition and load balancing strategies,can improve the parallel performance of iterative computations and save the costs in large scale numerical reservoir simulations.However,the ordinary domain decomposition method was found to have problems of increased computational load and slowed convergence,especially in working with non uniform domain numerical simulations.Here,we report the results of an efficient parallel approach that we have recently designed and implemented.This approach used preconditioned domain decomposition method and load balancing strategy based on the distributed parallel environment to reduce the computational complexity of non uniform numerical reservoir simulations and enhance the computational speed.Our computational results showed that the simulation speed was improved largely with a high speedup.