Theoretical and numerical analyses of pore-fluid flow focused heat transfer around geological faults and large cracks
Theoretical and numerical analyses of pore-fluid flow focused heat transfer around geological faults and large cracks
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DOI：
10.1016/j.compgeo.2007.06.011
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发表时间：
2008-05
影响因子：
5.3
通讯作者：
Chong-bin Zhao;Chong-bin Zhao;B. Hobbs;A. Ord;P. Hornby;H. Muhlhaus;S. Peng
中科院分区：
文献类型：
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作者：
Chong-bin Zhao;Chong-bin Zhao;B. Hobbs;A. Ord;P. Hornby;H. Muhlhaus;S. Peng
本文采用理论和数值方法研究了热液系统中任意长度尺度的地质断裂和裂缝周围孔隙流体流动的温度分布规律。在远场流入均匀且任意长度尺度的椭圆断层长轴平行于远场流入方向的情况下，给出了嵌入流体饱和多孔介质中的椭圆断层周围孔隙流体速度、流函数和超孔隙流体压力的完整解析解。由于解析解是在传统的笛卡尔坐标系中明确表示的，因此不仅可以从理论上了解地质断层和大裂缝周围的孔隙流体流动模式，而且可以作为验证任何数值方法的有价值的基准解。通过数值解与解析解的比较，验证了有限元计算模型的有效性，并将其应用于热液系统地质断层周围孔隙流体聚焦换热问题的研究。通过理论和数值分析，得出了地质断层对孔隙流体聚焦换热影响的一些有趣的结论。
In this paper, theoretical and numerical methods are used to investigate pore-fluid flow focused temperature distribution patterns around geological faults and cracks of any length-scales in hydrothermal systems. If the far field inflow is uniform and the long axis of an elliptical fault of any length-scale is parallel to the far field inflow direction, a complete set of analytical solutions has been presented for the pore-fluid velocity, stream function and excess pore-fluid pressure around the elliptical fault embedded in fluid-saturated porous media. Because the analytical solutions are explicitly expressed in the conventional Cartesian coordinate system, not only can they be used to gain a theoretical insight into the pore-fluid flow patterns around geological faults and large cracks, but also they can be used as valuable benchmark solutions for validating any numerical methods. After a finite element computational model is validated by comparing the numerical solutions with the present analytical solutions, it is used to investigate pore-fluid flow focused heat transfer around geological faults in hydrothermal systems. Some interesting conclusions in relation to the effects of geological faults on pore-fluid flow focused heat transfer have been made through both the theoretical and the numerical analyses.