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International Heat Transfer Conference 16

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

PORE SCALE SIMULATION FOR THERMO-HYDRO-MECHANICAL PROCESSES IN GEOPHYSICAL SYSTEM

Zhiqiang Chen
Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China

Moran Wang
Department of Engineering Mechanics and CNMM, Tsinghua University, Beijing 100084, China

DOI: 10.1615/IHTC16.pma.023174
pages 8099-8108


KEY WORDS: Porous media, Numerical simulation and super-computing, pore scale simulation, LBM-DEM, thermo-hydro-mechanical coupling, thermally induced damage

Abstract

Thermo-hydro-mechanical coupled processes are often observed in geophysical system, which greatly affect the underground engineering such as nuclear waste disposal, hydraulic fracture treatment, and geothermal exploration. In these processes, rock damage commonly happens once the thermal or hydrodynamic force reaches the threshold of local strength. However, thermally or hydraulically induced damage in rock has not been fully understood, owing to the limitation of experimental observation and detection as well as the challenge in simulating complex fracturing behavior in rock with traditional continuum-based methods (such as FEM). Therefore, in this work a thermal-hydro-mechanical coupled LBM-DEM model is developed to simulate fracturing behavior of rock under thermal or hydrodynamic force. Current model is validated by comparing with analytical solution and repeating previous results in literature. Finally, two applications, hydraulic fracture and thermal gradient cracking are simulated, and the numerical results are consistent with the experimental observations.

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