AMReX-FHD/FHDeX
Nov 2024 – Jan 2026
10 Months active
Languages Used
C++FortranMakefileShellBash
Technical Skills
Boundary ConditionsC++C++ DevelopmentData ManipulationData StructuresHigh-Performance Computing
Andy Nonaka
PROFILE
Andy Nonaka
Worked extensively on the AMReX-FHD/FHDeX repository, developing advanced simulation features and improving scientific computing workflows. Over ten months, delivered robust enhancements such as FFT-accelerated structure factor analysis, stochastic heat solvers supporting 1D to 3D, and improved surface coverage diagnostics. Applied C++ and Fortran to refactor core algorithms, optimize parallel computing routines, and ensure reproducibility through disciplined build system and CI/CD improvements. Addressed complex boundary condition handling, checkpointing, and data extraction challenges, while maintaining code quality with targeted cleanups and documentation updates. The work enabled scalable, analyzable simulations and streamlined onboarding, supporting both research throughput and long-term maintainability.
Overall Statistics
Feature vs Bugs
68%Features
Repository Contributions
96Total
Bugs
13
Commits
96
Features
28
Lines of code
8,959
Activity Months10
Your Network
72 peopleSame Organization
@lbl.gov61
Shared Repositories
11
Ann AlmgrenMember
Changho KimMember
isrivaMember
Ishan SrivastavaMember
Ishan SrivastavaMember
jbbMember
Jean M. SextonMember
Bhargav Sriram SiddaniMember
Weiqun ZhangMember
Work History
January 2026
14 Commits • 3 Features
Jan 1, 2026January 2026 monthly summary for AMReX-FHD/FHDeX. Focused on delivering a stochastic heat framework with 1D/2D/3D solvers, enhanced diagnostics and spectral analysis, and improvements to code quality and documentation. The work enables scalable, analyzable stochastic simulations with a maintainable codebase and repeatable build/configuration, directly supporting research throughput and reproducibility.
14 Commits • 3 Features
Jan 1, 2026January 2026 monthly summary for AMReX-FHD/FHDeX. Focused on delivering a stochastic heat framework with 1D/2D/3D solvers, enhanced diagnostics and spectral analysis, and improvements to code quality and documentation. The work enables scalable, analyzable stochastic simulations with a maintainable codebase and repeatable build/configuration, directly supporting research throughput and reproducibility.
January 2026
November 2025
1 Commits • 1 Features
Nov 1, 20252025-11 FHDeX monthly summary: Focused on code quality and maintainability. Implemented a targeted trailing whitespace cleanup in FHDeX, establishing cleaner, more consistent code and reducing noisy diffs that complicate PR reviews. This small but meaningful cleanup improves long-term maintainability and supports reliable future refactoring across the repository.
November 2025
1 Commits • 1 Features
Nov 1, 20252025-11 FHDeX monthly summary: Focused on code quality and maintainability. Implemented a targeted trailing whitespace cleanup in FHDeX, establishing cleaner, more consistent code and reducing noisy diffs that complicate PR reviews. This small but meaningful cleanup improves long-term maintainability and supports reliable future refactoring across the repository.
September 2025
1 Commits • 1 Features
Sep 1, 2025September 2025 monthly summary for AMReX-FHD/FHDeX. Focused on enabling FFT-based acceleration via a build-time flag and establishing a configurable pathway for FFT algorithms. Deliverable: FFT Support Enabled via Build Flag (USE_FFT) in FHDeX, activated in GNUmakefile. Commit traces provide traceability for the change. No bug fixes were recorded for this repository this month. Overall impact: groundwork for performance improvements and flexible deployment, enabling customers to opt-in to FFT-accelerated workflows with minimal changes. Technologies/skills demonstrated: GNUmakefile/build-system configuration, FFT integration, feature flagization, and version-control discipline.
1 Commits • 1 Features
Sep 1, 2025September 2025 monthly summary for AMReX-FHD/FHDeX. Focused on enabling FFT-based acceleration via a build-time flag and establishing a configurable pathway for FFT algorithms. Deliverable: FFT Support Enabled via Build Flag (USE_FFT) in FHDeX, activated in GNUmakefile. Commit traces provide traceability for the change. No bug fixes were recorded for this repository this month. Overall impact: groundwork for performance improvements and flexible deployment, enabling customers to opt-in to FFT-accelerated workflows with minimal changes. Technologies/skills demonstrated: GNUmakefile/build-system configuration, FFT integration, feature flagization, and version-control discipline.
September 2025
August 2025
4 Commits • 2 Features
Aug 1, 2025August 2025 performance summary for AMReX-FHD/FHDeX: Delivered two major improvements focusing on output management and code quality. The changes preserve behavior while reducing noise in artifacts, lowering maintenance burden, and improving onboarding for new contributors.
August 2025
4 Commits • 2 Features
Aug 1, 2025August 2025 performance summary for AMReX-FHD/FHDeX: Delivered two major improvements focusing on output management and code quality. The changes preserve behavior while reducing noise in artifacts, lowering maintenance burden, and improving onboarding for new contributors.
June 2025
2 Commits
Jun 1, 2025June 2025 monthly focus: stabilize numerical boundary behavior and ensure correctness of transport coefficient computations in FHDeX. No new features released this month; primary work consisted of targeted bug fixes that improve accuracy, robustness, and consistency of boundary conditions across dimensional configurations.
2 Commits
Jun 1, 2025June 2025 monthly focus: stabilize numerical boundary behavior and ensure correctness of transport coefficient computations in FHDeX. No new features released this month; primary work consisted of targeted bug fixes that improve accuracy, robustness, and consistency of boundary conditions across dimensional configurations.
June 2025
April 2025
6 Commits • 1 Features
Apr 1, 2025April 2025 performance highlights for AMReX-FHD/FHDeX: Key features delivered, major bugs fixed, and the resulting business value. Implemented enhancements to 2D structure factor analysis and surface coverage data handling (including 2D/flattened factors, slicepoint-based calculations, and variable naming refactors), with stabilization across the release. A critical timing fix ensures the first structure factor snapshot is recorded after the configured number of steps, improving measurement reliability in production runs. These changes elevate data fidelity, reproducibility, and maintainability, enabling faster scientific iteration and more accurate downstream analyses. Technologies and skills demonstrated include advanced data handling, algorithm optimization, refactoring for readability, and disciplined version-control practices.
April 2025
6 Commits • 1 Features
Apr 1, 2025April 2025 performance highlights for AMReX-FHD/FHDeX: Key features delivered, major bugs fixed, and the resulting business value. Implemented enhancements to 2D structure factor analysis and surface coverage data handling (including 2D/flattened factors, slicepoint-based calculations, and variable naming refactors), with stabilization across the release. A critical timing fix ensures the first structure factor snapshot is recorded after the configured number of steps, improving measurement reliability in production runs. These changes elevate data fidelity, reproducibility, and maintainability, enabling faster scientific iteration and more accurate downstream analyses. Technologies and skills demonstrated include advanced data handling, algorithm optimization, refactoring for readability, and disciplined version-control practices.
February 2025
15 Commits • 3 Features
Feb 1, 2025February 2025 performance summary for AMReX-FHD/FHDeX. Delivered and stabilized advanced surface coverage analysis and 2D/3D factor workflows, improved single-cell wall accuracy, and hardened checkpoint/restart across dimensions. Focused on maintainability and code quality to support long-running simulations and reproducibility across runs.
15 Commits • 3 Features
Feb 1, 2025February 2025 performance summary for AMReX-FHD/FHDeX. Delivered and stabilized advanced surface coverage analysis and 2D/3D factor workflows, improved single-cell wall accuracy, and hardened checkpoint/restart across dimensions. Focused on maintainability and code quality to support long-running simulations and reproducibility across runs.
February 2025
January 2025
35 Commits • 12 Features
Jan 1, 2025Concise monthly summary for 2025-01 focusing on delivering business value and technical wins in AMReX-FHD/FHDeX. Highlights include migrating to the modern amrex::FFT stack, refactoring to reduce geometry coupling, GPU-accelerated computations, and enhanced structure-factor analysis. The month also advanced 1D groundwork and improved build quality to reduce risk and maintenance overhead.
January 2025
35 Commits • 12 Features
Jan 1, 2025Concise monthly summary for 2025-01 focusing on delivering business value and technical wins in AMReX-FHD/FHDeX. Highlights include migrating to the modern amrex::FFT stack, refactoring to reduce geometry coupling, GPU-accelerated computations, and enhanced structure-factor analysis. The month also advanced 1D groundwork and improved build quality to reduce risk and maintenance overhead.
December 2024
13 Commits • 4 Features
Dec 1, 2024December 2024 (2024-12) performance summary for AMReX-FHD/FHDeX. Delivered high-impact features, robust validation, and build/tooling improvements that enhance analysis capabilities, performance, and reliability. The work collectively accelerates production workloads and reduces operational risk, while expanding GPU-accelerated capabilities.
13 Commits • 4 Features
Dec 1, 2024December 2024 (2024-12) performance summary for AMReX-FHD/FHDeX. Delivered high-impact features, robust validation, and build/tooling improvements that enhance analysis capabilities, performance, and reliability. The work collectively accelerates production workloads and reduces operational risk, while expanding GPU-accelerated capabilities.
December 2024
November 2024
5 Commits • 1 Features
Nov 1, 2024November 2024 focused on delivering slicing-aware structure factor capabilities and hardening the physics accuracy of FHDeX. Key work includes a new slice-aware structure factor computation for compressible_stag and targeted fixes to data extraction and boundary conditions to ensure reliable results across sliced data and moving-wall simulations. Improvements enhance data analysis capabilities, ensure consistent data layouts for valid structure factor analysis, and increase overall reliability of structure factor workflows.
November 2024
5 Commits • 1 Features
Nov 1, 2024November 2024 focused on delivering slicing-aware structure factor capabilities and hardening the physics accuracy of FHDeX. Key work includes a new slice-aware structure factor computation for compressible_stag and targeted fixes to data extraction and boundary conditions to ensure reliable results across sliced data and moving-wall simulations. Improvements enhance data analysis capabilities, ensure consistent data layouts for valid structure factor analysis, and increase overall reliability of structure factor workflows.
Activity
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Quality Metrics
Correctness88.6%
Maintainability88.4%
Architecture85.6%
Performance79.6%
AI Usage20.0%
Skills & Technologies
Programming Languages
BashC++FortranMakefileShell
Technical Skills
AMReXAMReX FrameworkBoundary ConditionsBug FixBug FixingBuild ConfigurationBuild SystemBuild System ConfigurationBuild SystemsC++C++ DevelopmentC++ developmentC++ programmingCI/CDCUDA
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