idaholab/moose
Nov 2024 – Mar 2026
15 Months active
Languages Used
BashCC++InputMarkdownXMLJinjaN/A
Technical Skills
C++ DevelopmentCode OrganizationCode RefactoringCode RenamingDocumentationDocumentation Management
Vasileios Kyriakopoulos
PROFILE
Vasileios Kyriakopoulos
Over 15 months, contributed to the idaholab/moose repository by developing and refining advanced simulation features for subchannel thermal-hydraulics and reactor analysis. Leveraging C++ and Python, delivered robust enhancements to mesh generation, heat transfer modeling, and postprocessing frameworks, while systematically improving code quality through refactoring, documentation updates, and test automation. Addressed complex numerical methods and implemented modular closure models for friction and heat transfer, supporting multiple geometries and physical regimes. Focused on maintainability and reliability, stabilized CI pipelines, expanded validation coverage, and aligned APIs and documentation. This work improved simulation fidelity, onboarding efficiency, and long-term maintainability for scientific computing workflows.
Overall Statistics
Feature vs Bugs
56%Features
Repository Contributions
255Total
Bugs
46
Commits
255
Features
59
Lines of code
69,200
Activity Months15
Your Network
204 peopleSame Organization
@inl.gov58
Bradley HuddlestonMember
BrettMember
Derek VranesMember
Butterworth, EvanMember
Gabriel J. SotoMember
Jason M MillerMember
Joseph CoronaVazquezMember
Kevin HarwoodMember
Larry AagesenMember
Shared Repositories
146
Riet, Adriaan AnthonyMember
Ansh ChaubeMember
Alex GrantMember
Alexander BlairMember
Alex LindsayMember
Alex LindsayMember
Andreas Henrik FrederiksenMember
WilkAndyMember
Aaron OaksMember
Work History
March 2026
1 Commits • 1 Features
Mar 1, 2026For 2026-03, delivered targeted documentation refinement for the ORNL 19-pin validation case in the idaholab/moose repository. Updated parameters and clarified experimental conditions and configurations to improve reproducibility and reduce misconfiguration. The work was completed with a single commit referenced to issue #29484. No major bug fixes were completed this month; focus was on documentation quality and clarity. This aligns with the ongoing validation workflow and supports faster onboarding and more reliable reproduction of results.
1 Commits • 1 Features
Mar 1, 2026For 2026-03, delivered targeted documentation refinement for the ORNL 19-pin validation case in the idaholab/moose repository. Updated parameters and clarified experimental conditions and configurations to improve reproducibility and reduce misconfiguration. The work was completed with a single commit referenced to issue #29484. No major bug fixes were completed this month; focus was on documentation quality and clarity. This aligns with the ongoing validation workflow and supports faster onboarding and more reliable reproduction of results.
March 2026
January 2026
5 Commits • 2 Features
Jan 1, 2026Month: 2026-01 — Delivered major improvements to the Duct Mesh Generators in idaholab/moose, including a new square duct mesh generator, robustness and usability enhancements, and documentation and code structure refinements to improve maintainability. Fixed a node placement issue in the duct mesh generator to ensure geometry consistency. Refactored heat transfer modeling documentation, updated closure model references, and corrected mathematical expressions for improved accuracy. These changes deliver tangible business value by enabling more reliable duct-based simulations, reducing downstream debugging, and improving overall modeling accuracy and developer productivity.
January 2026
5 Commits • 2 Features
Jan 1, 2026Month: 2026-01 — Delivered major improvements to the Duct Mesh Generators in idaholab/moose, including a new square duct mesh generator, robustness and usability enhancements, and documentation and code structure refinements to improve maintainability. Fixed a node placement issue in the duct mesh generator to ensure geometry consistency. Refactored heat transfer modeling documentation, updated closure model references, and corrected mathematical expressions for improved accuracy. These changes deliver tangible business value by enabling more reliable duct-based simulations, reducing downstream debugging, and improving overall modeling accuracy and developer productivity.
December 2025
9 Commits • 1 Features
Dec 1, 2025Monthly performance summary for 2025-12 (idaholab/moose). Delivered a feature-rich upgrade to subchannel heat transfer modeling and fixed a critical bug in transition regime limits. The feature adds laminar Nusselt clarification, Dittus–Boelter corrections, and multiple correlations (Borishanskii, Graber–Rieger, Schad–Modified), with accompanying tests and documentation. The bug fix ensures robust transition regime limits across specified conditions, preserving the integrity of the modeling process. Expanded test coverage and updated docs for the feature, reflecting strong emphasis on reliability and knowledge transfer. Overall, this work enhances fidelity of thermal-hydraulic simulations, reduces risk of erroneous results in transition regimes, and supports faster, more confident design decisions. Technologies demonstrated include thermal-hydraulic modeling, numerical methods, regression testing, documentation, and code review.
9 Commits • 1 Features
Dec 1, 2025Monthly performance summary for 2025-12 (idaholab/moose). Delivered a feature-rich upgrade to subchannel heat transfer modeling and fixed a critical bug in transition regime limits. The feature adds laminar Nusselt clarification, Dittus–Boelter corrections, and multiple correlations (Borishanskii, Graber–Rieger, Schad–Modified), with accompanying tests and documentation. The bug fix ensures robust transition regime limits across specified conditions, preserving the integrity of the modeling process. Expanded test coverage and updated docs for the feature, reflecting strong emphasis on reliability and knowledge transfer. Overall, this work enhances fidelity of thermal-hydraulic simulations, reduces risk of erroneous results in transition regimes, and supports faster, more confident design decisions. Technologies demonstrated include thermal-hydraulic modeling, numerical methods, regression testing, documentation, and code review.
December 2025
November 2025
16 Commits • 5 Features
Nov 1, 2025November 2025 monthly summary for idaholab/moose focused on visualization refinement, expanded heat transfer modeling, and code quality improvements that collectively enhance result clarity, accuracy, and maintainability. Highlights include aligning inlet SumWij values for the first axial level to improve visualization, delivering a modular HTC framework with multiple correlations for various subchannel geometries, and strengthening friction closures with QA and test coverage. Documentation updates clarify subchannel theory and HTC usage, while a const-correctness refactor improves correctness and compiler friendliness in heat computations.
November 2025
16 Commits • 5 Features
Nov 1, 2025November 2025 monthly summary for idaholab/moose focused on visualization refinement, expanded heat transfer modeling, and code quality improvements that collectively enhance result clarity, accuracy, and maintainability. Highlights include aligning inlet SumWij values for the first axial level to improve visualization, delivering a modular HTC framework with multiple correlations for various subchannel geometries, and strengthening friction closures with QA and test coverage. Documentation updates clarify subchannel theory and HTC usage, while a const-correctness refactor improves correctness and compiler friendliness in heat computations.
October 2025
20 Commits • 3 Features
Oct 1, 2025October 2025 monthly summary for idaholab/moose focusing on SCM closures and codebase stabilization. Delivered foundational SCM closures infrastructure, integrated friction closure support, and established workflow for creating and using closures within SCM problems. Addressed reviewer feedback and cleaned up cleanup tasks to improve maintainability. Documented relaxation scheme and stabilized builds/tests to reduce risk in CI. Codebase changes emphasize modular design, test reliability, and alignment with Cheng Todreas friction factor computations.
20 Commits • 3 Features
Oct 1, 2025October 2025 monthly summary for idaholab/moose focusing on SCM closures and codebase stabilization. Delivered foundational SCM closures infrastructure, integrated friction closure support, and established workflow for creating and using closures within SCM problems. Addressed reviewer feedback and cleaned up cleanup tasks to improve maintainability. Documented relaxation scheme and stabilized builds/tests to reduce risk in CI. Codebase changes emphasize modular design, test reliability, and alignment with Cheng Todreas friction factor computations.
October 2025
September 2025
4 Commits • 3 Features
Sep 1, 2025For 2025-09, the idaholab/moose subchannel module delivered several high-impact enhancements, with a focus on API clarity, physical fidelity under varying gravity, and maintainability improvements. The work underscores the team’s ability to evolve critical simulation capabilities while keeping documentation and tests in lockstep with code changes, enabling more accurate and scalable reactor-scale analyses.
September 2025
4 Commits • 3 Features
Sep 1, 2025For 2025-09, the idaholab/moose subchannel module delivered several high-impact enhancements, with a focus on API clarity, physical fidelity under varying gravity, and maintainability improvements. The work underscores the team’s ability to evolve critical simulation capabilities while keeping documentation and tests in lockstep with code changes, enabling more accurate and scalable reactor-scale analyses.
August 2025
20 Commits • 3 Features
Aug 1, 2025August 2025: Delivered targeted fixes and enhancements across SubChannel, SCM geometry, and postprocessing to improve numerical accuracy, visualization alignment, and test reliability. This work delivers clear business value: correct cross-flow indexing for subchannel calculations, standardized geometry terminology, heat-flux based postprocessing, and regolded tests reflecting visualization changes, while reducing technical debt by removing unused diffusion kernels.
20 Commits • 3 Features
Aug 1, 2025August 2025: Delivered targeted fixes and enhancements across SubChannel, SCM geometry, and postprocessing to improve numerical accuracy, visualization alignment, and test reliability. This work delivers clear business value: correct cross-flow indexing for subchannel calculations, standardized geometry terminology, heat-flux based postprocessing, and regolded tests reflecting visualization changes, while reducing technical debt by removing unused diffusion kernels.
August 2025
July 2025
30 Commits • 11 Features
Jul 1, 2025July 2025 (2025-07) monthly summary for idaholab/moose focused on correctness, stability, and testing. Delivered fixes to q_prime kernels (auxiliary and IC) with new tests and removal of duplicates; completed validation/regold cycles for THORS and EBR-II; made exponential interpolation the default; expanded test coverage; added radial profiles for data outputs/analysis; improvements in log cleanliness and memory usage; safety improvements for simulations (negative coolant power warning); and ongoing code quality efforts (review cleanup, refreshed baselines, and post-processor documentation).
July 2025
30 Commits • 11 Features
Jul 1, 2025July 2025 (2025-07) monthly summary for idaholab/moose focused on correctness, stability, and testing. Delivered fixes to q_prime kernels (auxiliary and IC) with new tests and removal of duplicates; completed validation/regold cycles for THORS and EBR-II; made exponential interpolation the default; expanded test coverage; added radial profiles for data outputs/analysis; improvements in log cleanliness and memory usage; safety improvements for simulations (negative coolant power warning); and ongoing code quality efforts (review cleanup, refreshed baselines, and post-processor documentation).
June 2025
15 Commits • 2 Features
Jun 1, 2025June 2025 monthly summary for idaholab/moose. Focused on delivering a standardized, CSVDiff-based test output workflow, enhancing input safety and simplifying test maintenance to strengthen reliability and business value. Key outcomes: - CSVDiff-based test outputs and CSV data standardized across heating, PSBT, coupling, subchannel, and related tests; introduced new postprocessors and updated configurations; enables w_perim reporting and additional test cases. (Refs #30861; commits include b3fc418..., 07bccb3..., 320c004..., 3ec335f..., 1c0a1b3..., 6c14c858..., e8be9fa..., e81f9289..., ad1a0ab...) - Improve input safety and flexibility: const-correct InputParameters usage and optional mesh generator inputs with defaults to reduce configuration burden. (Refs #30778, #30861; commits de2a9317..., 7b145f67...) - Test cleanup and maintenance: removed redundant/obsolete tests and files and updated documentation to streamline the test suite (Refs #30861; commits c0d9a40b..., 0602ca57..., f434d221..., 8e9522c6...) - Documentation alignment and maintainability: ensured docs reflect test suite changes and code adjustments, supporting faster onboarding and fewer regressions. Overall impact: improved test reliability and coverage, faster CI feedback, reduced maintenance overhead, and clearer signaling of test outcomes to stakeholders.
15 Commits • 2 Features
Jun 1, 2025June 2025 monthly summary for idaholab/moose. Focused on delivering a standardized, CSVDiff-based test output workflow, enhancing input safety and simplifying test maintenance to strengthen reliability and business value. Key outcomes: - CSVDiff-based test outputs and CSV data standardized across heating, PSBT, coupling, subchannel, and related tests; introduced new postprocessors and updated configurations; enables w_perim reporting and additional test cases. (Refs #30861; commits include b3fc418..., 07bccb3..., 320c004..., 3ec335f..., 1c0a1b3..., 6c14c858..., e8be9fa..., e81f9289..., ad1a0ab...) - Improve input safety and flexibility: const-correct InputParameters usage and optional mesh generator inputs with defaults to reduce configuration burden. (Refs #30778, #30861; commits de2a9317..., 7b145f67...) - Test cleanup and maintenance: removed redundant/obsolete tests and files and updated documentation to streamline the test suite (Refs #30861; commits c0d9a40b..., 0602ca57..., f434d221..., 8e9522c6...) - Documentation alignment and maintainability: ensured docs reflect test suite changes and code adjustments, supporting faster onboarding and fewer regressions. Overall impact: improved test reliability and coverage, faster CI feedback, reduced maintenance overhead, and clearer signaling of test outcomes to stakeholders.
June 2025
May 2025
9 Commits • 3 Features
May 1, 2025May 2025: Strengthened reliability and maintainability of idaholab/moose subchannel simulations through targeted test stabilization, validation enhancements, and code quality improvements. Key outcomes include bug-focused test reliability fixes, feature enhancements to THORS blockage modeling, and foundational calibration/documentation work that improves reproducibility and developer velocity.
May 2025
9 Commits • 3 Features
May 1, 2025May 2025: Strengthened reliability and maintainability of idaholab/moose subchannel simulations through targeted test stabilization, validation enhancements, and code quality improvements. Key outcomes include bug-focused test reliability fixes, feature enhancements to THORS blockage modeling, and foundational calibration/documentation work that improves reproducibility and developer velocity.
April 2025
24 Commits • 6 Features
Apr 1, 2025April 2025 monthly summary for idaholab/moose: this period focused on strengthening documentation quality, expanding modeling capabilities, and improving testing/quality assurance to accelerate development and increase confidence in results.
24 Commits • 6 Features
Apr 1, 2025April 2025 monthly summary for idaholab/moose: this period focused on strengthening documentation quality, expanding modeling capabilities, and improving testing/quality assurance to accelerate development and increase confidence in results.
April 2025
March 2025
27 Commits • 1 Features
Mar 1, 2025March 2025 monthly summary for idaholab/moose focusing on delivering critical bug fixes, targeted cleanups, and documentation/testing improvements that enhance reliability and maintainability of core subsystems and user-facing references.
March 2025
27 Commits • 1 Features
Mar 1, 2025March 2025 monthly summary for idaholab/moose focusing on delivering critical bug fixes, targeted cleanups, and documentation/testing improvements that enhance reliability and maintainability of core subsystems and user-facing references.
February 2025
42 Commits • 12 Features
Feb 1, 2025February 2025 monthly summary for idaholab/moose: This month emphasized codebase modernization, testing, and reliability improvements across the MOOSE project. Key outcomes include:
42 Commits • 12 Features
Feb 1, 2025February 2025 monthly summary for idaholab/moose: This month emphasized codebase modernization, testing, and reliability improvements across the MOOSE project. Key outcomes include:
February 2025
January 2025
23 Commits • 3 Features
Jan 1, 2025January 2025 monthly summary for idaholab/moose: Delivered API consistency improvements and documentation updates, stabilized tests, and improved code quality. Implemented EBR-II documentation updates, aligned API naming (rod to Pin) and MeshGenerators, addressed reviewer feedback, cleaned up code and initializations, and tightened test tolerances to ensure reliable results. Business value includes clearer API surfaces, maintainable docs, and more stable results across revisions.
January 2025
23 Commits • 3 Features
Jan 1, 2025January 2025 monthly summary for idaholab/moose: Delivered API consistency improvements and documentation updates, stabilized tests, and improved code quality. Implemented EBR-II documentation updates, aligned API naming (rod to Pin) and MeshGenerators, addressed reviewer feedback, cleaned up code and initializations, and tightened test tolerances to ensure reliable results. Business value includes clearer API surfaces, maintainable docs, and more stable results across revisions.
November 2024
10 Commits • 3 Features
Nov 1, 2024November 2024 monthly summary for idaholab/moose: focused refactor and clean-up in SCM-related Subchannel work, delivering a naming-convention overhaul, removing deprecated code paths, and updating docs to reflect new APIs. These changes enhance API stability, reduce maintenance surface, and establish a solid foundation for future Subchannel/SCM work.
10 Commits • 3 Features
Nov 1, 2024November 2024 monthly summary for idaholab/moose: focused refactor and clean-up in SCM-related Subchannel work, delivering a naming-convention overhaul, removing deprecated code paths, and updating docs to reflect new APIs. These changes enhance API stability, reduce maintenance surface, and establish a solid foundation for future Subchannel/SCM work.
November 2024
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Quality Metrics
Correctness89.8%
Maintainability88.6%
Architecture85.6%
Performance80.0%
AI Usage20.6%
Skills & Technologies
Programming Languages
BashBibTeXCC++CSVExoDiffExodusExodusDiffFortranGit
Technical Skills
Bug FixingBuild ScriptingC++C++ DevelopmentC++ developmentC++ programmingCFDCode CleanupCode DocumentationCode MaintenanceCode OrganizationCode RefactoringCode RenamingCode ReviewCodebase Cleanup
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