提出了一种将特征值法与大时间步长格式(MOC-LTS)相结合的液体管道瞬态流动模拟新方法

IF 4.8 Q2 ENERGY & FUELS
Shengyuan Wei, Shangfei Song, Bohui Shi, Jing Gong
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引用次数: 0

摘要

水锤事故对管道运行的安全和稳定构成重大威胁。因此,快速、精确的瞬态流动模拟对于有效制定科学的水锤控制策略至关重要。然而,目前主流的液体管道瞬态流动模拟方法主要采用显式格式来求解瞬态流动控制方程,需要遵守Courant-Friedrichs-Lewy (CFL)≤1的稳定性准则。这导致了有限的时间步长,这反过来又限制了计算效率,特别是在模拟大型管网中的水力行为时。本文提出了一种将特征法(MOC)与大时间步长格式(LTS)相结合的方法,以实现对液体管道瞬态流动的快速、准确模拟。该方法将计算域离散为连续的控制体,根据它们在大时间步长内是否受到边界条件的影响,将它们分类为边界或内部控制体。对于内部控制卷,采用基于一阶Godunov格式的LTS方案来提高计算效率。对于边界控制体,迭代应用MOC精确捕获边界动力学,直到模拟时间与内部控制体的模拟时间相匹配。定量分析验证了所提方法的性能。结果表明,该方法在保持最小精度损失的同时,在计算效率上优于MOC。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A novel approach integrating the method of characteristics with large time-step scheme (MOC-LTS) for efficient transient flow simulation in liquid pipelines
Water hammer incidents pose a significant risk to the safety and stability of pipeline operations. Therefore, rapid and precise transient flow simulation is essential for efficiently developing scientific water hammer control strategies. Nevertheless, the prevailing transient flow simulation methods for liquid pipelines predominantly employ explicit schemes to solve transient flow control equations, necessitating adherence to the stability criterion of Courant-Friedrichs-Lewy (CFL) ≤ 1. This results in limited time step size, which in turn constrains computational efficiency, particularly when simulating hydraulic behavior in large-scale pipeline networks. In this paper, a novel approach integrating the method of characteristics (MOC) with a large time-step scheme (LTS) is proposed to enable rapid and accurate simulation of transient flow in liquid pipelines. The proposed approach discretizes the computational domain into contiguous control volumes, ategorizing them as either boundary or internal control volumes depending on whether they are affected by boundary conditions within a large time step. For internal control volumes, an LTS scheme based on the first-order Godunov format is employed to improve computational efficiency. For boundary control volumes, MOC is applied iteratively to accurately capture boundary dynamics until the simulated time matches that of the internal control volumes. Quantitative analysis is conducted to verify the performance of the proposed approach. The results confirm that the proposed approach outperforms the MOC in computational efficiency while maintaining minimal accuracy loss.
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CiteScore
7.50
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