Korea Advanced Institute of Science and Technology · Engineering
Professor Jinhyun Choo's research lab specializes in computational mechanics and multiscale modeling of geomaterials, with a focus on unsaturated and porous media, fracture mechanics, and large deformation behavior. The lab develops thermodynamically consistent, phase-field, and finite element frameworks to model complex hydromechanical processes in heterogeneous materials such as shale, soils, and fractured rocks. Key research directions include double-porosity modeling, viscoplasticity in layered materials, volumetric locking mitigation in meshfree and particle methods, and locally conservative simulations of fluid-infiltrated porous media at large strains.
Figures are computed from collected data and may differ slightly.
Geomaterials with aggregated structure or containing fissures often exhibit a bimodal pore size distribution that can be viewed as two coexisting pore regions of different scales. The double-porosity concept enables continuum modeling of such materials by considering two interacting pore scales satisfying relevant conservation laws. This paper develops a thermodynamically consistent framework for hydromechanical modeling of unsaturated flow in double-porosity media. With an explicit treatment of
Summary We introduce a phase‐field method for continuous modeling of cracks with frictional contacts. Compared with standard discrete methods for frictional contacts, the phase‐field method has two attractive features: (i) it can represent arbitrary crack geometry without an explicit function or basis enrichment, and (ii) it does not require an algorithm for imposing contact constraints. The first feature, which is common in phase‐field models of fracture, is attained by regularizing a sharp int
Abstract Viscoplastic deformation of shale is frequently observed in many subsurface applications. Many studies have suggested that this viscoplastic behavior is anisotropic—specifically, transversely isotropic—and closely linked to the layered composite structure at the microscale. In this work, we develop a two‐scale constitutive model for shale in which anisotropic viscoplastic behavior naturally emerges from semianalytical homogenization of a bilayer microstructure. The microstructure is mod
Abstract The material point method (MPM) is frequently used to simulate large deformations of nearly incompressible materials such as water, rubber, and undrained porous media. However, MPM solutions to nearly incompressible materials are susceptible to volumetric locking, that is, overly stiff behavior with erroneous strain and stress fields. While several approaches have been devised to mitigate volumetric locking in the MPM, they require significant modifications of the existing MPM machinery
Summary Numerical modeling of large deformations in fluid‐infiltrated porous media must accurately describe not only geometrically nonlinear kinematics but also fluid flow in heterogeneously deforming pore structure. Accurate simulation of fluid flow in heterogeneous porous media often requires a numerical method that features the local (elementwise) conservation property. Here, we introduce a new finite element framework for locally mass conservative solution of coupled poromechanical problems
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