采用双流体模型的管道气液流动有限元计算方法

IF 2.5 3区 工程技术 Q3 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS
Xiaowei Li , Ruichao Tian , Limin He , Yuling Lv , Shidong Zhou , Yaqiang Li
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引用次数: 0

摘要

两相流通常在不同领域的气液管道中观察到,包括核能,石油和化学工业。由于流动特性的准确预测对工程应用至关重要,各种处理的一维双流体模型已被广泛应用于通过一组非线性偏微分方程(PDEs)来数学描述管道中的气液变化。本文提出了一种将隐式格式与有限元法相结合的模块化算法,通过气液分层计算来求解一维双流体模型。为了验证该算法的准确性,采用了四种不同网格尺寸、进口流量和出口压力的情况来考察稳态气液流动的数值特征,并利用该算法计算的数值变化与OLGA模拟器计算的数值变化的一致性来分析瞬态气液行为。稳态流场沿管道显示出两个明显的区域:受进口非平衡状态影响的强烈动量交换区和受气体可压缩性影响的温和动量交换区。值得注意的是,更细的网格将产生更准确的流动参数描述在激烈区,而相对稀疏的网格足以在温和区。在单相气体初始条件下,管道内气液变化可分为三个阶段:由气体可压缩性决定的气体膨胀阶段、受气体推进力影响的气体扩散阶段和由液体运动决定的液体充注阶段。不同静流体初始条件下气液变化的三个阶段的一致性识别突出了所提出的数值方法在描述瞬态特征方面的有效性和准确性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A FEM computational approach for gas-liquid flow in pipelines using a two-fluid model
Two-phase flow is typically observed in gas-liquid pipelines across diverse domains, including nuclear, petroleum, and chemical industries. As accurate prediction of flow characteristics is crucial for engineering applications, one-dimensional two-fluid models with various treatments have been extensively employed to mathematically describe the gas-liquid variations in the pipelines through a set of non-linear partial differential equations (PDEs). This paper presents a modularly designed algorithm that incorporates an implicit scheme coupled with the finite element method (FEM) to solve the one-dimensional two-fluid model with gas-liquid stratified calculation. To validate the accuracy of this algorithm, four cases utilizing varying mesh sizes, inlet flows, and outlet pressures are conducted to scrutinize numerical steady-state gas-liquid flow characteristics, and the consistency between the numerical variations computed through this algorithm and those from OLGA simulator is used to analyze transient gas-liquid behaviors. The steady-state flow fields reveal two distinct zones along the pipe: an intense momentum exchange zone influenced by the inlet nonequilibrium state and a gentle momentum exchange zone influenced by the gas compressibility. Notably, a finer mesh will yield more accurate descriptions of flow parameters in the intense zone, while a relatively sparser mesh suffices for the gentle zone. Additionally, the transient results reveal that the gas-liquid variations in the pipe under initial condition of single-phase gas can be divided into three stages: the gas expansion stage determined by gas compressibility, the gas spread stage influenced by the gas propulsion, and the liquid filling stage decided by the liquid kinetic motion. The consistent identification of the three stages in gas-liquid variations under initial conditions of different static fluids highlights the effectiveness and accuracy of the proposed numerical method in describing transient features.
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来源期刊
Computers & Fluids
Computers & Fluids 物理-计算机:跨学科应用
CiteScore
5.30
自引率
7.10%
发文量
242
审稿时长
10.8 months
期刊介绍: Computers & Fluids is multidisciplinary. The term ''fluid'' is interpreted in the broadest sense. Hydro- and aerodynamics, high-speed and physical gas dynamics, turbulence and flow stability, multiphase flow, rheology, tribology and fluid-structure interaction are all of interest, provided that computer technique plays a significant role in the associated studies or design methodology.
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