
Frank Fei developed advanced simulation features for the GEOS-DEV/GEOS repository, focusing on fracture mechanics, poromechanics, and reactive transport. He implemented scalable rock toughness with anisotropic fracture support and phase-field nucleation modeling for hydraulic fracturing, integrating C++ and CMake with finite element and phase-field methods. Frank also delivered a single-phase reactive transport solver linked to HPCReact, enabling thermal fluid dynamics and multiple reaction models. His work included code refactoring, test updates, and CI/CD improvements using YAML, which enhanced build reliability and reproducibility. The depth of his contributions addressed complex physical modeling challenges and improved the robustness of scientific workflows.

January 2026 (GEOS-DEV/GEOS): Core capability delivered and CI reliability improved. Implemented a single-phase reactive transport solver integrated with HPCReact, enabling thermal fluid dynamics and multiple reaction models. Strengthened CI by disabling unit tests on Ubuntu Debug builds to prevent timeouts and added handling for empty CLI args, reducing false negatives and improving build stability. These work items position GEOS for broader use in reactive transport simulations and faster, more reliable integration cycles.
January 2026 (GEOS-DEV/GEOS): Core capability delivered and CI reliability improved. Implemented a single-phase reactive transport solver integrated with HPCReact, enabling thermal fluid dynamics and multiple reaction models. Strengthened CI by disabling unit tests on Ubuntu Debug builds to prevent timeouts and added handling for empty CLI args, reducing false negatives and improving build stability. These work items position GEOS for broader use in reactive transport simulations and faster, more reliable integration cycles.
March 2025 monthly summary for GEOS-DEV/GEOS. Key feature delivered: Phase-field nucleation modeling for hydraulic fracturing with damage-coupled poromechanics, including a phase-field solver integration for poromechanics and damage-aware constitutive models for porous materials. Boundary conditions were updated to reflect damage effects on traction. The work was implemented and committed as part of PR #2125 (commit 5732c5c0be16ead0b846c302ed06d30988da4a9f).
March 2025 monthly summary for GEOS-DEV/GEOS. Key feature delivered: Phase-field nucleation modeling for hydraulic fracturing with damage-coupled poromechanics, including a phase-field solver integration for poromechanics and damage-aware constitutive models for porous materials. Boundary conditions were updated to reflect damage effects on traction. The work was implemented and committed as part of PR #2125 (commit 5732c5c0be16ead0b846c302ed06d30988da4a9f).
Month 2025-01: Delivered scalable rock toughness feature for GEOS with anisotropic fracture toughness support; refactored toughness parameters; added scaling and fracture origin parameters; and updated tests and documentation. No major bugs were documented for GEOS this month. This work enhances physical realism, modeling fidelity, and reproducibility, while improving configurability for fracture analyses.
Month 2025-01: Delivered scalable rock toughness feature for GEOS with anisotropic fracture toughness support; refactored toughness parameters; added scaling and fracture origin parameters; and updated tests and documentation. No major bugs were documented for GEOS this month. This work enhances physical realism, modeling fidelity, and reproducibility, while improving configurability for fracture analyses.
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