OpenModelica/OpenModelica
Nov 2024 – Oct 2025
12 Months active
Languages Used
CC++MakefileModelicaCMakereStructuredTextMOTemplate
Technical Skills
Algorithm OptimizationAlgorithm RefactoringBackend DevelopmentBug FixingC ProgrammingCode Formatting
phannebohm
PROFILE
Phannebohm
Philipp Hannebohm contributed to the OpenModelica/OpenModelica repository by developing and refining core simulation and compiler features over a twelve-month period. He engineered robust numerical solvers, enhanced symbolic differentiation for arrays, and improved backend reliability through targeted refactoring and code generation updates. Using C, C++, and Modelica, he addressed complex challenges in Jacobian handling, memory management, and simulation runtime stability. His work included optimizing array manipulation, standardizing diagnostics, and strengthening test coverage, resulting in more maintainable and scalable code. Hannebohm’s technical depth is evident in his systematic approach to performance tuning, bug resolution, and maintainability improvements across the codebase.
Overall Statistics
Feature vs Bugs
73%Features
Repository Contributions
96Total
Bugs
12
Commits
96
Features
33
Lines of code
22,583
Activity Months12
Your Network
13 people
Work History
October 2025
8 Commits • 3 Features
Oct 1, 2025October 2025: OpenModelica/OpenModelica delivered stability and correctness improvements across the simulation stack, with a focus on hashing reliability, Modelica generation utilities, memory safety, and homotopy behavior, complemented by formatting and I/O improvements. These changes reduce simulation surprises, lower memory leaks, and improve maintainability and developer velocity.
8 Commits • 3 Features
Oct 1, 2025October 2025: OpenModelica/OpenModelica delivered stability and correctness improvements across the simulation stack, with a focus on hashing reliability, Modelica generation utilities, memory safety, and homotopy behavior, complemented by formatting and I/O improvements. These changes reduce simulation surprises, lower memory leaks, and improve maintainability and developer velocity.
October 2025
September 2025
13 Commits • 4 Features
Sep 1, 2025September 2025 monthly summary for OpenModelica development. Progress focused on stabilizing code generation, enhancing backend differentiation, and expanding user control in DAE mode, while improving code quality and FMU build robustness. Delivered concrete template and backend improvements, added configurability, and performed targeted maintenance to reduce technical debt and improve reliability for downstream users and integrations.
September 2025
13 Commits • 4 Features
Sep 1, 2025September 2025 monthly summary for OpenModelica development. Progress focused on stabilizing code generation, enhancing backend differentiation, and expanding user control in DAE mode, while improving code quality and FMU build robustness. Delivered concrete template and backend improvements, added configurability, and performed targeted maintenance to reduce technical debt and improve reliability for downstream users and integrations.
August 2025
11 Commits • 4 Features
Aug 1, 2025OpenModelica: August 2025 — Focused on delivering core feature improvements, backend refactor, and strengthened test coverage to improve modeling precision, performance, and reliability. Highlights include symbolic math improvements for arrays, new Array.toString API, backend utilities refactor for correctness and efficiency, and reinforced test coverage including moist air properties.
11 Commits • 4 Features
Aug 1, 2025OpenModelica: August 2025 — Focused on delivering core feature improvements, backend refactor, and strengthened test coverage to improve modeling precision, performance, and reliability. Highlights include symbolic math improvements for arrays, new Array.toString API, backend utilities refactor for correctness and efficiency, and reinforced test coverage including moist air properties.
August 2025
July 2025
3 Commits • 1 Features
Jul 1, 2025Monthly summary for OpenModelica/OpenModelica (July 2025): Delivered stability and performance improvements in GBODE by fixing isKRightAvailable handling and enabling configurable Jacobian updates with code-gen refactors and enhanced runtime statistics.
July 2025
3 Commits • 1 Features
Jul 1, 2025Monthly summary for OpenModelica/OpenModelica (July 2025): Delivered stability and performance improvements in GBODE by fixing isKRightAvailable handling and enabling configurable Jacobian updates with code-gen refactors and enhanced runtime statistics.
June 2025
7 Commits • 2 Features
Jun 1, 2025June 2025 monthly summary for OpenModelica/OpenModelica: Delivered key enhancements to the GBODE solver for robustness and performance; fixed a compiler index mapping bug; and improved logs readability and code quality. These changes improve simulation reliability, enable faster convergence, and reduce maintenance overhead across the repository.
7 Commits • 2 Features
Jun 1, 2025June 2025 monthly summary for OpenModelica/OpenModelica: Delivered key enhancements to the GBODE solver for robustness and performance; fixed a compiler index mapping bug; and improved logs readability and code quality. These changes improve simulation reliability, enable faster convergence, and reduce maintenance overhead across the repository.
June 2025
May 2025
3 Commits • 1 Features
May 1, 2025May 2025 monthly summary for OpenModelica: Delivered performance and reliability improvements in GBODE solver logging and compiler backend robustness. Key outcomes include reduced log noise and faster simulations through targeted logging, and improved compilation robustness by preventing redundant assignments in conditional branches and avoiding unsafe expansion of unknown-size arrays. These changes enhance overall simulation throughput, reliability of builds, and developer productivity.
May 2025
3 Commits • 1 Features
May 1, 2025May 2025 monthly summary for OpenModelica: Delivered performance and reliability improvements in GBODE solver logging and compiler backend robustness. Key outcomes include reduced log noise and faster simulations through targeted logging, and improved compilation robustness by preventing redundant assignments in conditional branches and avoiding unsafe expansion of unknown-size arrays. These changes enhance overall simulation throughput, reliability of builds, and developer productivity.
April 2025
3 Commits
Apr 1, 2025April 2025 monthly summary for OpenModelica: This period focused on stabilizing and documenting the GBODE solver in OpenModelica. The work improved reliability, clarified behavior, and reduced technical debt, delivering measurable business value for model accuracy and user productivity.
3 Commits
Apr 1, 2025April 2025 monthly summary for OpenModelica: This period focused on stabilizing and documenting the GBODE solver in OpenModelica. The work improved reliability, clarified behavior, and reduced technical debt, delivering measurable business value for model accuracy and user productivity.
April 2025
March 2025
5 Commits • 1 Features
Mar 1, 2025Monthly summary for 2025-03 - OpenModelica/OpenModelica. Focus: delivery of key features and stabilization work on compiler/runtime numerical methods; event emission on equidistant time grids. Includes outcomes, impact, and technologies demonstrated.
March 2025
5 Commits • 1 Features
Mar 1, 2025Monthly summary for 2025-03 - OpenModelica/OpenModelica. Focus: delivery of key features and stabilization work on compiler/runtime numerical methods; event emission on equidistant time grids. Includes outcomes, impact, and technologies demonstrated.
February 2025
2 Commits • 1 Features
Feb 1, 2025February 2025 performance summary for OpenModelica OpenModelica focusing on delivering robust simulation capabilities and improving modeling reliability.
2 Commits • 1 Features
Feb 1, 2025February 2025 performance summary for OpenModelica OpenModelica focusing on delivering robust simulation capabilities and improving modeling reliability.
February 2025
January 2025
11 Commits • 4 Features
Jan 1, 2025January 2025 – OpenModelica: Key features delivered and critical fixes enabled more robust simulations and maintainability. Delivered Newton diagnostics and nonlinear solver enhancements, improved memory safety reporting, corrected numerical backend behaviors, expanded compiler data handling, and added algebraic loop support. Implemented initialization robustness and generalized option handling to improve developer experience. This month’s work enhances solver reliability, diagnostic visibility, and model scalability, supporting more complex simulations and safer deployments.
January 2025
11 Commits • 4 Features
Jan 1, 2025January 2025 – OpenModelica: Key features delivered and critical fixes enabled more robust simulations and maintainability. Delivered Newton diagnostics and nonlinear solver enhancements, improved memory safety reporting, corrected numerical backend behaviors, expanded compiler data handling, and added algebraic loop support. Implemented initialization robustness and generalized option handling to improve developer experience. This month’s work enhances solver reliability, diagnostic visibility, and model scalability, supporting more complex simulations and safer deployments.
December 2024
14 Commits • 5 Features
Dec 1, 2024December 2024 highlights for OpenModelica: Delivered significant improvements across conditional logic simplification, backend robustness, diagnostics, code generation, and translations. Key outcomes include reduced complexity and increased solvability in if-expressions and if-equations, more reliable Jacobian handling with a common interface and corrected sparsity mappings, standardized Newton diagnostics across systems, clearer and more actionable code-generation errors, and Qt translation compatibility across versions. These changes improve model reliability, debugging productivity, and cross-version build stability, delivering meaningful business value to users and contributors by shortening iteration cycles and reducing runtime issues.
14 Commits • 5 Features
Dec 1, 2024December 2024 highlights for OpenModelica: Delivered significant improvements across conditional logic simplification, backend robustness, diagnostics, code generation, and translations. Key outcomes include reduced complexity and increased solvability in if-expressions and if-equations, more reliable Jacobian handling with a common interface and corrected sparsity mappings, standardized Newton diagnostics across systems, clearer and more actionable code-generation errors, and Qt translation compatibility across versions. These changes improve model reliability, debugging productivity, and cross-version build stability, delivering meaningful business value to users and contributors by shortening iteration cycles and reducing runtime issues.
December 2024
November 2024
16 Commits • 7 Features
Nov 1, 2024OpenModelica monthly summary for 2024-11: Delivered configurable linearization and robust Jacobian handling, with notable performance improvements in NBackEnd, stronger test stability, and clearer constants/reinit semantics. Highlights include a new CLI flag --maxSizeLinearization, a none linearization target, unified Jacobian generation modes, gating to skip symbolic Jacobian when disabled, tearing performance improvements, NBackEnd refactors for dynamic Jacobian robustness, improved constants access across SimCode/Templates, and Gbode tableau refinements. These changes reduce build/test brittleness, enable larger models to be analyzed efficiently, and strengthen code quality through formatting cleanup. Tech disciplines demonstrated: C/C++/Modelica tooling, testing, performance optimization, refactoring, and data structure optimization.
November 2024
16 Commits • 7 Features
Nov 1, 2024OpenModelica monthly summary for 2024-11: Delivered configurable linearization and robust Jacobian handling, with notable performance improvements in NBackEnd, stronger test stability, and clearer constants/reinit semantics. Highlights include a new CLI flag --maxSizeLinearization, a none linearization target, unified Jacobian generation modes, gating to skip symbolic Jacobian when disabled, tearing performance improvements, NBackEnd refactors for dynamic Jacobian robustness, improved constants access across SimCode/Templates, and Gbode tableau refinements. These changes reduce build/test brittleness, enable larger models to be analyzed efficiently, and strengthen code quality through formatting cleanup. Tech disciplines demonstrated: C/C++/Modelica tooling, testing, performance optimization, refactoring, and data structure optimization.
Activity
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Quality Metrics
Correctness88.2%
Maintainability86.8%
Architecture84.2%
Performance79.2%
AI Usage20.2%
Skills & Technologies
Programming Languages
CC++CMakeMOMakefileModelicaShellTemplatereStructuredText
Technical Skills
Algorithm DevelopmentAlgorithm OptimizationAlgorithm RefactoringArray HandlingArray ManipulationAssertion HandlingBackend DevelopmentBug FixingBuild SystemBuild SystemsCC ProgrammingC programmingC++C++ programming
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