chaos-polymtl/lethe
Nov 2024 – Dec 2025
8 Months active
Languages Used
C++NonePrmRSTrsttextPythonCMake
Technical Skills
C++CFD SimulationCFD simulationCode FormattingCode OptimizationConfiguration Management
Olivier Guévremont
PROFILE
Olivier Guévremont
Olivier Guevremont developed advanced simulation features and stability improvements for the chaos-polymtl/lethe repository, focusing on tracer physics, mesh adaptation, and solver reliability. He implemented Gaussian-based reaction models and selective mesh refinement strategies in C++ to enhance physical realism and computational efficiency, particularly for immersed boundary and catalysis simulations. His work included removing external dependencies, modernizing code for clang v20 compatibility, and expanding test coverage to ensure robust, maintainable releases. Through targeted documentation updates and UI enhancements using C++ and HTML, Olivier improved usability for researchers, enabling more accurate, scalable, and reliable computational fluid dynamics simulations across diverse scenarios.
Overall Statistics
Feature vs Bugs
85%Features
Repository Contributions
20Total
Bugs
2
Commits
20
Features
11
Lines of code
158,301
Activity Months8
Your Network
6 peopleShared Repositories
6
Work History
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.
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
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.
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.
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.
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
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.
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.
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.
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
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.
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.
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.
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
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.
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.
Activity
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Quality Metrics
Correctness95.0%
Maintainability90.6%
Architecture87.0%
Performance85.6%
AI Usage20.0%
Skills & Technologies
Programming Languages
C++CMakeHTMLNonePrmPythonRSTrsttext
Technical Skills
Build SystemsC++C++ DevelopmentC++ developmentCFD SimulationCFD simulationCode FormattingCode OptimizationCode RefactoringCode refactoringComputational Fluid DynamicsConfiguration ManagementData analysisDebuggingDocumentation
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