Linear and nonlinear unified fluid flow in fractured porous media considering flow pattern adaptive conversions

IF 5.3 1区 工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Computers and Geotechnics Pub Date : 2024-11-06 DOI:10.1016/j.compgeo.2024.106856
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Abstract

Linear and nonlinear fluid flow in fractured rock masses often co-occurs because of the hydraulic pressure gradient discrepancy and significant permeability difference between fractures and rock matrixes. In the current Darcy-Forchheimer coupled theory, the linear and nonlinear fluid flow is often artificially and strictly confined to rock matrixes and fractures, respectively. In this study, we conducted a numerical study on linear and nonlinear unified fluid flow in fractured porous media, considering flow pattern adaptive conversions instead of artificial constraints. The flow pattern adaptive conversion is realized by a conversion factor of linear and nonlinear fluid flow. A numerical linear and nonlinear unified fluid flow method was proposed using the unified pipe-network method. The accuracy and correctness of the proposed method were validated by comparing it with the result of both linear and nonlinear fluid flow. This method can effectively describe the linear and nonlinear mixed fluid flow and calculate the distributions of linear and nonlinear flow regions in fractured porous media. Characteristics of the unified fluid flow in fractured porous media were analyzed in detail by parametric discussions based on the developed numerical method.
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考虑流型自适应转换的断裂多孔介质中的线性和非线性统一流体流动
断裂岩体中的线性和非线性流体流动经常同时存在,这是因为断裂和岩石基质之间存在水压梯度差异和显著的渗透率差异。在目前的达西-福克海默耦合理论中,线性和非线性流体流动往往被人为地严格分别限制在岩石基质和裂缝中。在本研究中,我们对断裂多孔介质中的线性和非线性统一流体流进行了数值研究,考虑了流型自适应转换而不是人为限制。流型自适应转换是通过线性和非线性流体流动的转换因子实现的。利用统一管网法提出了线性和非线性统一流体流动数值方法。通过与线性和非线性流体流动结果的比较,验证了所提方法的准确性和正确性。该方法能有效地描述线性和非线性混合流体流动,并计算出断裂多孔介质中线性和非线性流动区域的分布。基于所开发的数值方法,通过参数讨论详细分析了断裂多孔介质中统一流体流动的特征。
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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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