利用解析的 CFD-DEM 耦合模型深入了解气体对孔隙堵塞的影响

IF 5.3 1区 工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS
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引用次数: 0

摘要

孔隙堵塞现象是多孔介质中常见的现象,并已得到广泛研究。然而,随着涉及气液两相流的水合物提取和二氧化碳(CO2)封存等领域的日益突出,气体对孔隙堵塞的影响在很大程度上仍未得到探讨。本研究采用耦合解析计算流体动力学和离散元素法(CFD-DEM),结合流体体积法(VOF)模拟气液两相流。此外,还采用了扫描真实颗粒和截顶锥孔隙来模拟流体流动下的孔隙堵塞过程。结果表明,气体的存在加剧了流体场内的湍流。此外,气体、流体和颗粒之间的相互作用增加了作用在颗粒上的阻力的可变性。这两个因素导致颗粒堆稳定性下降,并降低了孔隙堵塞的可能性。此外,参数研究还表明,随着气体成分的增加,颗粒阻力的波动会增大,颗粒通过孔隙的速度也会增加。随着收缩直径的增大,颗粒通过孔隙的速度加快,气体的影响减小。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
An insight into the effect of gas on pore clogging using a resolved CFD-DEM coupling model
Pore clogging phenomena are commonly encountered in porous media and have been extensively investigated. However, with the increasing prominence of fields like hydrate extraction and carbon dioxide (CO2) sequestration, which involve gas–liquid two-phase flow, the effect of gas on pore clogging remains largely unexplored. This study employed a coupled resolved computational fluid dynamics and discrete element method (CFD-DEM) in conjunction with the volume of fluid (VOF) method to simulate gas–liquid two-phase flow. In addition, scanned real particles and a truncated-cone pore are employed to simulate pore clogging process under fluid flow. The results indicate that the presence of gas intensifies the turbulence within the fluid field. Additionally, the interaction among gas, fluid, and particles increases the variability of the drag forces acting on the particles. These two factors lead to a decrease in particle pile stability and reduce the possibility of pore clogging. Moreover, the parameters study shows that with the increase of gas fraction, the fluctuation of particle drag force increases and the velocity of particles passing through pore increases. With the increase of constriction diameter, the velocity of particles passing through pore is accelerated, and the influence of gas is reduced.
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来源期刊
Computers and Geotechnics
Computers and Geotechnics 地学-地球科学综合
CiteScore
9.10
自引率
15.10%
发文量
438
审稿时长
45 days
期刊介绍: The use of computers is firmly established in geotechnical engineering and continues to grow rapidly in both engineering practice and academe. The development of advanced numerical techniques and constitutive modeling, in conjunction with rapid developments in computer hardware, enables problems to be tackled that were unthinkable even a few years ago. Computers and Geotechnics provides an up-to-date reference for engineers and researchers engaged in computer aided analysis and research in geotechnical engineering. The journal is intended for an expeditious dissemination of advanced computer applications across a broad range of geotechnical topics. Contributions on advances in numerical algorithms, computer implementation of new constitutive models and probabilistic methods are especially encouraged.
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