Numerical modeling of two-phase flow in deformable porous media: application to CO$$_2$$ injection analysis in the Otway Basin, Australia

Kim, Tae Hyun; Park, Chan Hee; Watanabe, Norihiro; Park, Eui-Seob; Park, Jung–Wook; Jung, Yong‐Bok; Kolditz, Olaf

doi:10.1007/s12665-021-09411-1

Cited by 2 publications

(1 citation statement)

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“…OGS-FLAC combines OpenGeoSys version 5.8 for thermal and hydraulic analysis and FLAC3D version 5.0 for mechanical analysis. It is a numerical simulator that performs T-H-M coupled analysis, as shown in Figure 1 [7][8]. OpenGeoSys has strength in thermal-hydraulic analysis, but the mechanical constitutive model for the buffer material, such as the Barcelona Basic Model, is not provided.…”

Section: Numerical Codementioning

confidence: 99%

A numerical study on THM coupled behavior in the high-level radioactive waste disposal system

Kim

Park

Lee

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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It is essential to securely isolate high-level radioactive waste from the biosphere, and geologic disposal of it at a deep underground repository is considered the most effective method. Therefore, it is crucial to research the complex thermo-hydro-mechanical-chemical (THMC) coupled behavior in geological disposal systems parallel with numerical simulation. DECOVALEX is an international cooperating project to efficiently develop numerical methods and models and validate through test results for predicting the THMC interactions in the disposal systems. In Task C of DECOVALEX-2023, the modeling teams focus on understanding pore pressure development and THM interactions in the host rock and buffer material during the FE experiment, a 1:1 scale in-situ heater test based on Nagra’s Reference repository design. We used OGS-FLAC3D for the numerical simulation, combining OpenGeoSys for TH simulation and FLAC3D for M simulation. At the first phase of the task, a simple two-dimensional benchmark problem was defined to set up the numerical model. THM coupled processes in the bentonite were simulated with a two-phase flow system, and we investigated the temperature and pressure variations on the given monitoring position. Vaporization induced by a temperature increase in the bentonite was observed at the heater’s vicinity, and flow occurred by capillarity, and pressure difference was well simulated. Additionally, the flow process was dominant in the near field of engineering barrier, while we observed thermal pressurization in the far-field area. We plan to apply the developed model to a full-scale three-dimensional numerical simulation for the next phase.

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Section: Numerical Codementioning

confidence: 99%