Abstract
In this study, a three-dimensional (3D) contact fracture model with different normal stresses is established by using artificial rough fractures. To investigate the influence of fracture void and contact changes caused by stress variation on the nonlinear fluid flow process, smooth and hypothetical fractures with the same mechanical aperture are constructed for comparative analysis. The results show that the direct numerical solution of the 3D Navier–Stokes equation is consistent with the experimental results of stress-seepage flow. Compared with the smooth and hypothetical fractures, the contact rate evolution caused by stress changes enhances the nonlinearity of fluid flow in the 3D fractures. The pressure boundary, high-velocity catastrophe area, and eddy distribution area in the contact area are highly consistent. Eddy appears in the backflow area around the contact area and increases with the contact rate and flow rate increase. The critical Reynolds number increases with the increase in the contact ratio, indicating the presence of local effects in the development of eddy, leading to a lag in the appearance of nonlinear flow state. The multi-vortex system operates in an unclosed “8” shape between two pairs, and there is competition but no exchange between the vortices. Finally, it is proposed that the volume average value of vorticity can effectively characterize the variation trend of vorticity with contact rate in the fractures.
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Data availability
The data that support the findings of this study are available from the corresponding author, Shuhong Wang, upon reasonable request.
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Funding
This work was conducted with supports from the National Natural Science Foundation of China (Grant Nos. U1602232 and 51474050), Liaoning Science and Technology Project (2019JH2/10100035).
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Ze Zhang: data curation, results and discussion, writing—original draft. Shuhong Wang: conceptualization, methodology, funding acquisition, resources. Tianjiao Yang: final editing, writing—review and editing. Furui Dong: writing—review and editing. Zehui Gao: project administration. Dongsheng Wang: writing—review and editing.
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Zhang, Z., Wang, S., Yang, T. et al. Influence of contact characteristics on nonlinear flow and eddy development in three-dimensional fractures under normal stress. Bull Eng Geol Environ 83, 129 (2024). https://doi.org/10.1007/s10064-024-03644-7
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DOI: https://doi.org/10.1007/s10064-024-03644-7