4C-multiphysics/4C
Feb 2025 – Mar 2026
10 Months active
Languages Used
C++RSTCMakeXMLYAML
Technical Skills
C++SimulationSoftware EngineeringDocumentationGit WorkflowC++ Development
Lea Koeglmeier
PROFILE
Lea Koeglmeier
Over ten months, contributed to the 4C-multiphysics/4C repository by developing and refining simulation features for multiphase flow and poroelasticity in C++. Delivered runtime VTK-based output systems, body force-aware solid equations, and material models for blood lung volume fractions, enhancing model fidelity and observability. Improved contributor experience through documentation and standardized Git workflows, while code refactoring and span-based array handling increased maintainability and performance. Integrated finite element methods, numerical simulation, and data logging, with robust testing and configuration management. Used C++, CMake, and YAML to ensure reproducible, reliable simulations, focusing on clarity, extensibility, and efficient handling of complex scientific workflows.
Overall Statistics
Feature vs Bugs
75%Features
Repository Contributions
22Total
Bugs
4
Commits
22
Features
12
Lines of code
15,457
Activity Months10
Your Network
198 peopleShared Repositories
51
Dharini BalachandranMember
Abhiroop SatheeshMember
Alexander HermannMember
Amadeus GebauerMember
Barbara WirthlMember
Benedikt GoderbauerMember
Benno SchoensteinMember
Christoph SchmidtMember
Daniel WolffMember
Work History
March 2026
1 Commits • 1 Features
Mar 1, 2026March 2026: Delivered a Span Refactor in 4C to replace std::vector with std::span for safer, more efficient handling of array-like data. This feature improves memory safety and reduces dynamic resizing concerns, setting the stage for zero-copy views and future performance optimizations. No major bugs fixed this month; efforts were focused on a targeted feature improvement with a single commit (2e291cfa34dfeaed0ff74a9e3c45413df7677fbc, 'Small beauty'). Repository: 4C-multiphysics/4C.
1 Commits • 1 Features
Mar 1, 2026March 2026: Delivered a Span Refactor in 4C to replace std::vector with std::span for safer, more efficient handling of array-like data. This feature improves memory safety and reduces dynamic resizing concerns, setting the stage for zero-copy views and future performance optimizations. No major bugs fixed this month; efforts were focused on a targeted feature improvement with a single commit (2e291cfa34dfeaed0ff74a9e3c45413df7677fbc, 'Small beauty'). Repository: 4C-multiphysics/4C.
March 2026
December 2025
1 Commits • 1 Features
Dec 1, 2025Month 2025-12: Focused on delivering a key capability in the 4C multiphysics model by introducing body force-aware solid equations for 2D and 3D multiphase flow in deformable porous media, with improvements in code clarity and material checks to ensure accurate simulations. The work enhances gravity and fluid–structure coupling, improves model fidelity, and reduces risk of mis-simulations.
December 2025
1 Commits • 1 Features
Dec 1, 2025Month 2025-12: Focused on delivering a key capability in the 4C multiphysics model by introducing body force-aware solid equations for 2D and 3D multiphase flow in deformable porous media, with improvements in code clarity and material checks to ensure accurate simulations. The work enhances gravity and fluid–structure coupling, improves model fidelity, and reduces risk of mis-simulations.
November 2025
7 Commits • 2 Features
Nov 1, 2025Month 2025-11: Delivered key enhancements to the 4C simulation workflow, focusing on restart/output reliability and test coverage. Implemented Restart and Final-State Output Enhancements to streamline restart data, refined WRITE_FINAL_STATE behavior to emit only necessary restart data, updated stress/strain related docs/tests, and clarified input parameters for the new vtk-based output system. Added Porofluid Output Quantity Support and Test Enhancements to enable additional output quantities, updated YAML tests, and clarified XML naming to reflect content. Performed Code Cleanup by removing the unused determine_optional_quantity function from model evaluators to reduce dead code and improve maintainability. Result: more robust I/O, cleaner codebase, and stronger test coverage, enabling faster, more reliable feature delivery with better business value for simulation workflows.
7 Commits • 2 Features
Nov 1, 2025Month 2025-11: Delivered key enhancements to the 4C simulation workflow, focusing on restart/output reliability and test coverage. Implemented Restart and Final-State Output Enhancements to streamline restart data, refined WRITE_FINAL_STATE behavior to emit only necessary restart data, updated stress/strain related docs/tests, and clarified input parameters for the new vtk-based output system. Added Porofluid Output Quantity Support and Test Enhancements to enable additional output quantities, updated YAML tests, and clarified XML naming to reflect content. Performed Code Cleanup by removing the unused determine_optional_quantity function from model evaluators to reduce dead code and improve maintainability. Result: more robust I/O, cleaner codebase, and stronger test coverage, enabling faster, more reliable feature delivery with better business value for simulation workflows.
November 2025
October 2025
3 Commits • 2 Features
Oct 1, 2025October 2025 — 4C-multiphysics/4C: Delivered key postprocessing and solver-testing capabilities that improve data correctness, maintainability, and reliability.
October 2025
3 Commits • 2 Features
Oct 1, 2025October 2025 — 4C-multiphysics/4C: Delivered key postprocessing and solver-testing capabilities that improve data correctness, maintainability, and reliability.
September 2025
2 Commits • 1 Features
Sep 1, 2025September 2025 monthly summary focusing on key business value and technical achievements for 4C-multiphysics/4C. Key features delivered, major bugs fixed, and overall impact are highlighted with concrete deliverables and commit references.
2 Commits • 1 Features
Sep 1, 2025September 2025 monthly summary focusing on key business value and technical achievements for 4C-multiphysics/4C. Key features delivered, major bugs fixed, and overall impact are highlighted with concrete deliverables and commit references.
September 2025
August 2025
3 Commits • 1 Features
Aug 1, 2025In August 2025, delivered a major feature for blood lung volume fractions in the porofluid-pressure-based framework, enabling volume fractions to be deformation- and pressure-dependent. Added a new material type with updated parameters, and integrated with tests and inputs. Introduced two closing relations—"blood_lung" and the existing "homogenized_vasculature_tumor"—and ensured end-to-end test coverage across 2D/3D scenarios. Improved maintainability and clarity through evaluator renaming to include HomogenizedVasculatureTumor. Performed a targeted documentation fix to reduce user confusion and kept the repository in sync with model changes.
August 2025
3 Commits • 1 Features
Aug 1, 2025In August 2025, delivered a major feature for blood lung volume fractions in the porofluid-pressure-based framework, enabling volume fractions to be deformation- and pressure-dependent. Added a new material type with updated parameters, and integrated with tests and inputs. Introduced two closing relations—"blood_lung" and the existing "homogenized_vasculature_tumor"—and ensured end-to-end test coverage across 2D/3D scenarios. Improved maintainability and clarity through evaluator renaming to include HomogenizedVasculatureTumor. Performed a targeted documentation fix to reduce user confusion and kept the repository in sync with model changes.
June 2025
2 Commits • 1 Features
Jun 1, 2025June 2025 monthly summary for 4C-multiphysics/4C: Delivered a unified runtime output system for porofluid_pressure_based with VTK-based artery output integration and a dynamic CSV writer for domain integrals. This unifies and enhances runtime observability, enables continuous logging, and standardizes output handling across simulations, improving reproducibility and post-run analytics.
2 Commits • 1 Features
Jun 1, 2025June 2025 monthly summary for 4C-multiphysics/4C: Delivered a unified runtime output system for porofluid_pressure_based with VTK-based artery output integration and a dynamic CSV writer for domain integrals. This unifies and enhances runtime observability, enables continuous logging, and standardizes output handling across simulations, improving reproducibility and post-run analytics.
June 2025
May 2025
1 Commits • 1 Features
May 1, 2025May 2025 monthly summary for the 4C repository focused on improving contributor experience and governance through documentation enhancements. Delivered a targeted Git workflow and contribution process guide to clarify how contributors should clone, fork, set upstream, and manage the local main branch, reducing onboarding friction and clarifying PR procedures.
May 2025
1 Commits • 1 Features
May 1, 2025May 2025 monthly summary for the 4C repository focused on improving contributor experience and governance through documentation enhancements. Delivered a targeted Git workflow and contribution process guide to clarify how contributors should clone, fork, set upstream, and manage the local main branch, reducing onboarding friction and clarifying PR procedures.
March 2025
1 Commits • 1 Features
Mar 1, 2025Monthly summary for 2025-03 (repository: 4C-multiphysics/4C). Key features delivered: - Arteries Module Runtime Visualization Output: Enables runtime visualization of arterial simulation data during execution. Refactors output logic to use a new visualization writer and adds restart support by reading previous time steps to provide intermediate results for monitoring and debugging. Impact and value: - Improves observability, debugging, and restart resilience for long-running arterial simulations, reducing troubleshooting time and enabling more reliable validation and monitoring. Technologies/skills demonstrated: - Runtime data visualization integration, writer abstraction, restart-aware I/O, and code refactor for output handling. Commit reference: - 01432230e1998a377f2f7f66cd824a047f3777ce: Add runtime output to arteries
1 Commits • 1 Features
Mar 1, 2025Monthly summary for 2025-03 (repository: 4C-multiphysics/4C). Key features delivered: - Arteries Module Runtime Visualization Output: Enables runtime visualization of arterial simulation data during execution. Refactors output logic to use a new visualization writer and adds restart support by reading previous time steps to provide intermediate results for monitoring and debugging. Impact and value: - Improves observability, debugging, and restart resilience for long-running arterial simulations, reducing troubleshooting time and enabling more reliable validation and monitoring. Technologies/skills demonstrated: - Runtime data visualization integration, writer abstraction, restart-aware I/O, and code refactor for output handling. Commit reference: - 01432230e1998a377f2f7f66cd824a047f3777ce: Add runtime output to arteries
March 2025
February 2025
1 Commits • 1 Features
Feb 1, 2025February 2025 monthly summary for 4C development. Delivered a new VTK-based output pathway for pressure-based arteries, replacing the legacy output mechanism and removing the obsolete arterial post-processing. Implemented and validated through a dedicated artery VTK test to ensure the new format works end-to-end.
February 2025
1 Commits • 1 Features
Feb 1, 2025February 2025 monthly summary for 4C development. Delivered a new VTK-based output pathway for pressure-based arteries, replacing the legacy output mechanism and removing the obsolete arterial post-processing. Implemented and validated through a dedicated artery VTK test to ensure the new format works end-to-end.
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Quality Metrics
Correctness91.8%
Maintainability90.0%
Architecture90.0%
Performance81.0%
AI Usage21.8%
Skills & Technologies
Programming Languages
C++CMakeRSTXMLYAML
Technical Skills
C++C++ DevelopmentC++ developmentCode RefactoringComputational PhysicsConfiguration ManagementData LoggingData StructuresDocumentationFinite Element AnalysisFinite Element MethodFull Stack DevelopmentGit WorkflowLinear AlgebraMaterial Modeling
Repositories Contributed To
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