A hybrid pore-network-continuum modeling framework for flow and transport in 3D digital images of porous media

IF 4 2区 环境科学与生态学 Q1 WATER RESOURCES
Li Zhang , Bo Guo , Chaozhong Qin , Yongqiang Xiong
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Abstract

Understanding flow and transport in multiscale porous media is challenging due to the presence of a wide range of pore sizes. Recent imaging advances offer high-resolution characterization of the multiscale pore structures. However, simulating flow and transport in 3D digital images requires models to represent both the resolved and sub-resolution pore structures. We develop a hybrid pore-network-continuum modeling framework. The hybrid framework treats the smaller pores below the image resolution as a continuum using the Darcy-scale formalism and explicitly represents the larger pores resolved in the images employing a pore network model. We validate the hybrid model against direct numerical simulations for single-phase flow and solute transport and further demonstrate its applicability for simulating two-component gas transport in a shale rock sample. The results indicate that the new hybrid model represents the flow and transport process in multiscale porous media while being much more computationally efficient than direct numerical simulation methods for the range of simulated conditions.

Abstract Image

Abstract Image

多孔介质三维数字图像中流动和传输的孔隙网络-连续混合建模框架
由于存在多种孔隙大小,了解多尺度多孔介质中的流动和传输具有挑战性。最新的成像技术可对多尺度孔隙结构进行高分辨率表征。然而,要模拟三维数字图像中的流动和传输,需要建立模型来表示分辨率和亚分辨率孔隙结构。我们开发了一种孔隙-网络-真空混合建模框架。该混合框架使用达西尺度形式将图像分辨率以下的较小孔隙视为连续体,并使用孔隙网络模型明确表示图像中解析的较大孔隙。我们通过对单相流和溶质迁移的直接数值模拟验证了混合模型,并进一步证明了该模型适用于模拟页岩样本中的双组分气体迁移。结果表明,新的混合模型代表了多尺度多孔介质中的流动和传输过程,同时在模拟条件范围内,其计算效率远远高于直接数值模拟方法。
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来源期刊
Advances in Water Resources
Advances in Water Resources 环境科学-水资源
CiteScore
9.40
自引率
6.40%
发文量
171
审稿时长
36 days
期刊介绍: Advances in Water Resources provides a forum for the presentation of fundamental scientific advances in the understanding of water resources systems. The scope of Advances in Water Resources includes any combination of theoretical, computational, and experimental approaches used to advance fundamental understanding of surface or subsurface water resources systems or the interaction of these systems with the atmosphere, geosphere, biosphere, and human societies. Manuscripts involving case studies that do not attempt to reach broader conclusions, research on engineering design, applied hydraulics, or water quality and treatment, as well as applications of existing knowledge that do not advance fundamental understanding of hydrological processes, are not appropriate for Advances in Water Resources. Examples of appropriate topical areas that will be considered include the following: • Surface and subsurface hydrology • Hydrometeorology • Environmental fluid dynamics • Ecohydrology and ecohydrodynamics • Multiphase transport phenomena in porous media • Fluid flow and species transport and reaction processes
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