chaos-polymtl/lethe
Nov 2024 – Apr 2026
9 Months active
Languages Used
C++NonePrmRSTrsttextPythonCMake
Technical Skills
C++CFD SimulationCFD simulationCode FormattingCode OptimizationConfiguration Management
Olivier Guévremont
PROFILE
Olivier Guévremont
Worked on the chaos-polymtl/lethe repository, delivering twelve features and two bug fixes over nine months focused on computational fluid dynamics and scientific computing. Developed advanced tracer physics models, including Gaussian-based reactions and stability enhancements for low-order kinetics, and implemented selective mesh refinement for immersed boundary simulations. Improved simulation flexibility by enabling restart-time-step overrides and periodic boundary conditions across multiple solvers. Enhanced documentation with IEEE-formatted references and publication traceability, supporting research reproducibility. Used C++, CMake, and Python to optimize code quality, streamline build systems, and expand test coverage, ensuring robust, maintainable solutions for complex numerical simulations and end-user workflows.
Overall Statistics
Feature vs Bugs
86%Features
Repository Contributions
21Total
Bugs
2
Commits
21
Features
12
Lines of code
158,305
Activity Months9
Your Network
7 peopleWork History
April 2026
1 Commits • 1 Features
Apr 1, 2026April 2026 monthly summary for chaos-polymtl/lethe: Delivered a targeted documentation enhancement to reflect a recent publication, improving accuracy and citation traceability in the Lethe docs. The change is documentation-only, with no impact to core functionality, reinforcing transparency and user trust while maintaining fast delivery.
1 Commits • 1 Features
Apr 1, 2026April 2026 monthly summary for chaos-polymtl/lethe: Delivered a targeted documentation enhancement to reflect a recent publication, improving accuracy and citation traceability in the Lethe docs. The change is documentation-only, with no impact to core functionality, reinforcing transparency and user trust while maintaining fast delivery.
April 2026
December 2025
1 Commits • 1 Features
Dec 1, 20252025-12 monthly summary for chaos-polymtl/lethe focused on the robustness of the tracer reaction model at low reaction orders. Delivered a stability enhancement by introducing a positive-concentration surrogate C_effective = sqrt(C^2 + epsilon^2) with an explicit epsilon parameter to prevent numerical issues when the reaction order approaches zero. Added tests (including an MMS-based low-order case) and updated documentation to cover the new parameter. Resulted in improved solver stability, reduced risk of numerical failures in low-concentration regimes, and increased reliability of tracer dynamics simulations with minimal performance impact. All tests pass and the work aligns with the project’s reliability and accuracy goals.
December 2025
1 Commits • 1 Features
Dec 1, 20252025-12 monthly summary for chaos-polymtl/lethe focused on the robustness of the tracer reaction model at low reaction orders. Delivered a stability enhancement by introducing a positive-concentration surrogate C_effective = sqrt(C^2 + epsilon^2) with an explicit epsilon parameter to prevent numerical issues when the reaction order approaches zero. Added tests (including an MMS-based low-order case) and updated documentation to cover the new parameter. Resulted in improved solver stability, reduced risk of numerical failures in low-concentration regimes, and increased reliability of tracer dynamics simulations with minimal performance impact. All tests pass and the work aligns with the project’s reliability and accuracy goals.
November 2025
6 Commits • 1 Features
Nov 1, 2025November 2025: Delivered user-facing UI refresh for the Publications page, enabling a larger, more accessible slideshow; introduced a restart-time-step override to give researchers tighter control over adaptive simulations; and achieved broader clang v20 compatibility with code quality improvements across core modules and tests. These changes enhance discoverability of recent research, improve simulation control and reliability, and reduce build-time friction across the codebase.
6 Commits • 1 Features
Nov 1, 2025November 2025: Delivered user-facing UI refresh for the Publications page, enabling a larger, more accessible slideshow; introduced a restart-time-step override to give researchers tighter control over adaptive simulations; and achieved broader clang v20 compatibility with code quality improvements across core modules and tests. These changes enhance discoverability of recent research, improve simulation control and reliability, and reduce build-time friction across the codebase.
November 2025
September 2025
1 Commits • 1 Features
Sep 1, 2025September 2025 monthly summary for chaos-polymtl/lethe focused on advancing physical realism in tracer physics through Gaussian-based mechanisms. Delivered a Gaussian-based reaction model localized at the interface of immersed solids to mimic active sites, and introduced a Gaussian model for tracer diffusivity to control phase exchange. The work enhances the accuracy of catalysis simulations while preserving maintainability and traceability.
September 2025
1 Commits • 1 Features
Sep 1, 2025September 2025 monthly summary for chaos-polymtl/lethe focused on advancing physical realism in tracer physics through Gaussian-based mechanisms. Delivered a Gaussian-based reaction model localized at the interface of immersed solids to mimic active sites, and introduced a Gaussian model for tracer diffusivity to control phase exchange. The work enhances the accuracy of catalysis simulations while preserving maintainability and traceability.
April 2025
1 Commits • 1 Features
Apr 1, 2025April 2025 - Chaos Polymtl Lethe: Delivered selective refinement for immersed boundary mesh around moving solids in the Sharp IB solver, and fixed a refinement frequency bug. This work refines IB-adjacent cells only when solids have moved since the last time step, reducing compute cost for stationary solids, large meshes, or many/complex solids, while preserving accurate interface capture for moving solids. Commit: 56d9e234f5e52770349b0fca8a25b72abb724d3e ('Fix refinement frequency bug in Sharp IB solver (#1479)'). Overall impact: improved performance, scalability, and resource efficiency for IB simulations, enabling larger and more complex problems with preserved accuracy. Technologies/skills: performance optimization, mesh refinement strategy, debugging, version control, collaboration.
1 Commits • 1 Features
Apr 1, 2025April 2025 - Chaos Polymtl Lethe: Delivered selective refinement for immersed boundary mesh around moving solids in the Sharp IB solver, and fixed a refinement frequency bug. This work refines IB-adjacent cells only when solids have moved since the last time step, reducing compute cost for stationary solids, large meshes, or many/complex solids, while preserving accurate interface capture for moving solids. Commit: 56d9e234f5e52770349b0fca8a25b72abb724d3e ('Fix refinement frequency bug in Sharp IB solver (#1479)'). Overall impact: improved performance, scalability, and resource efficiency for IB simulations, enabling larger and more complex problems with preserved accuracy. Technologies/skills: performance optimization, mesh refinement strategy, debugging, version control, collaboration.
April 2025
March 2025
2 Commits • 2 Features
Mar 1, 2025March 2025 monthly summary for chaos-polymtl/lethe: Delivered key feature improvements including dependency cleanup by removing muParser and related code, and introduced periodic boundary condition capabilities for Cahn-Hilliard, heat transfer, and tracer solvers, aligning with the VOF solver approach. Completed documentation updates and test coverage to ensure stability post-removal and integration of new features. These changes reduce external dependencies, streamline builds, standardize physics parameterization, and expand solver capabilities, contributing to more accurate periodic-domain simulations with consistent UX across auxiliary physics.
March 2025
2 Commits • 2 Features
Mar 1, 2025March 2025 monthly summary for chaos-polymtl/lethe: Delivered key feature improvements including dependency cleanup by removing muParser and related code, and introduced periodic boundary condition capabilities for Cahn-Hilliard, heat transfer, and tracer solvers, aligning with the VOF solver approach. Completed documentation updates and test coverage to ensure stability post-removal and integration of new features. These changes reduce external dependencies, streamline builds, standardize physics parameterization, and expand solver capabilities, contributing to more accurate periodic-domain simulations with consistent UX across auxiliary physics.
February 2025
1 Commits • 1 Features
Feb 1, 2025February 2025 monthly summary for chaos-polymtl/lethe: Delivered first-order tracer reactions (homogeneous and heterogeneous) with tests and documentation, enhancing tracer physics realism and analysis capabilities. This feature delivers end-to-end support for first-order kinetics in tracer simulations, improving fidelity, validation, and usability for researchers and engineers. No major bugs fixed this month; focus was on feature delivery, tests, and documentation to ensure robust adoption and long-term maintainability.
1 Commits • 1 Features
Feb 1, 2025February 2025 monthly summary for chaos-polymtl/lethe: Delivered first-order tracer reactions (homogeneous and heterogeneous) with tests and documentation, enhancing tracer physics realism and analysis capabilities. This feature delivers end-to-end support for first-order kinetics in tracer simulations, improving fidelity, validation, and usability for researchers and engineers. No major bugs fixed this month; focus was on feature delivery, tests, and documentation to ensure robust adoption and long-term maintainability.
February 2025
January 2025
1 Commits • 1 Features
Jan 1, 2025January 2025: Documentation update for chaos-polymtl/lethe adding two 2025 publications with IEEE-formatted references, clarifying core functionalities and research usage of Lethe.
January 2025
1 Commits • 1 Features
Jan 1, 2025January 2025: Documentation update for chaos-polymtl/lethe adding two 2025 publications with IEEE-formatted references, clarifying core functionalities and research usage of Lethe.
November 2024
7 Commits • 3 Features
Nov 1, 2024November 2024 (2024-11): Focused on completing release-ready documentation and example maintenance for chaos-polymtl/lethe, delivering tracer physics improvements, and introducing a new static mixer tracer demo. The work enhances end-user readability, validation rigor, and simulation flexibility while preserving code quality and release discipline.
7 Commits • 3 Features
Nov 1, 2024November 2024 (2024-11): Focused on completing release-ready documentation and example maintenance for chaos-polymtl/lethe, delivering tracer physics improvements, and introducing a new static mixer tracer demo. The work enhances end-user readability, validation rigor, and simulation flexibility while preserving code quality and release discipline.
November 2024
Activity
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Quality Metrics
Correctness95.2%
Maintainability91.0%
Architecture87.6%
Performance86.2%
AI Usage20.0%
Skills & Technologies
Programming Languages
C++CMakeHTMLNonePrmPythonRSTreStructuredTextrsttext
Technical Skills
Build SystemsC++C++ DevelopmentC++ developmentCFD SimulationCFD simulationCode FormattingCode OptimizationCode RefactoringCode refactoringComputational Fluid DynamicsConfiguration ManagementData analysisDebuggingDocumentation
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