Exasim v1.4 (2026-02-15)

Exasim v1.4 Release Notes

Release date: 2026-02-15
Target branch: master
Comparison: v1.2...master

Executive summary

Exasim v1.4 consolidates backend solver and postprocessing upgrades, expands MATLAB/frontend mesh and boundary-expression tooling, broadens example coverage (including quick regression runs), improves multi-app execution/logging workflows, and advances Text2Code and coupled-solver functionality. This release also includes substantial repository hygiene improvements for generated artifacts and ignore rules.

Release scope from v1.2 to master:

• 188 commits
• 7640 files changed
• 410,681 insertions, 4,365 deletions
• Commit date range: 2025-05-08 to 2026-02-15

Changed files by domain

Domain	Files touched
backend	222
frontends	878
examples	649
apps	59
text2code	4122
install	17

Highlights by domain

backend

• Added/expanded postprocessing capabilities including configurable visualization outputs and new solution readers.
• Added support paths and interface helpers for coupled solver workflows.
• Extended MPI support for monolithic coupled solver pathways.
• Included incremental HDG and memory-usage improvements, plus backend cleanup of legacy/commented code paths.
• Standardized communicator usage updates (migration away from raw MPI_COMM_WORLD in favor of EXASIM_COMM_WORLD).

frontends (MATLAB/Python/Julia tooling)

• Added primitive boundary-expression library in MATLAB and boundary plotting helpers.
• Added mesh utilities (extrusion, rotation, spherical frustum, connectivity diagnostics).
• Added or refined preprocessing and visualization-related utility paths.

examples

• Expanded quick-run and example coverage, including new/updated 2D/3D cases.
• Added quick PDE-family runner script to accelerate smoke/regression checks.
• Updated specific application configurations (for example MHD Magnetic Vortex settings).

apps

• Refactored apps/runapps.sh workflows to support per-case logs and final pass/fail summaries.

text2code

• Added Fint/Fext function support and symbolic-generation fixes.
• Integrated large generated-model surface updates from text2code/backends.

install/build/docs

• Multiple installation/build instruction updates in README and workflow files.
• Dependency/build path refinements and CI/workflow adjustments.

New features

• Coupled-solver interface function support in backend/model paths.
• MPI capability for monolithic coupled solver workflows.
• Postprocessing enhancements for reading/visualization outputs.
• MATLAB boundary-expression primitives and visualization helpers.
• Expanded quick example test orchestration (examples/runquickexamples.m).
• Per-app logging and summary behavior for application batch execution.

Improvements and refactors

• Cleanup of redundant/legacy solver/discretization code paths.
• Improved mesh/preprocessing utilities and data handling in frontends.
• Better repository hygiene via .gitignore tightening for generated artifacts.
• Broader and more structured example coverage across PDE families.

Bug fixes

• ParaView/GPU visualization fixes and crash-time output behavior improvements.
• Symbolic function return-type correction in text2code generation path.
• Assorted HDG/preconditioner/restart/read-solution stability fixes across backend cycles.

Breaking changes

Potentially breaking for downstream/custom integrations:

• Legacy nonlinear wrapper APIs and some stale declarations were removed from backend solver/solution headers and implementations.
• Projects relying on previously exposed but obsolete interfaces may need to migrate to current solver entry points.

Migration and upgrade notes

• Rebuild backend binaries and generated model code after upgrade.
• If custom code referenced removed solver APIs, migrate to active CSolution/CSolver pathways currently used in master.
• Re-run preprocessing for apps/examples where mesh or partition assumptions changed.
• If release packaging consumes generated files, align with updated .gitignore behavior and artifact locations.

Validation/testing done for this release-note draft

• Performed read-only Git analysis for v1.2..master.
• Refreshed remote branches with fetch --all --prune.
• Computed commit/file deltas and domain breakdown.
• No full build/test matrix was executed as part of this release-note drafting step.

Known issues / follow-ups

• upstream remote is not configured in this local clone (only origin is present).
• Tag fetch reported a local/remote tag conflict for v1.2 when attempting fetch --tags; validate tag consistency before publishing the final release tag.
• This range contains many merge and maintenance commits with terse messages; consider a final editorial pass before publishing public release notes.

Full commit list (grouped by month)

2026-02

• a497f678 update gitignore
• f6d3031d gitignore: ignore generated Poisson example artifacts
• 73b85a52 examples/mhd: adjust MagneticVortex MPI and RB settings
• a24aac51 examples: add quick PDE-family test runner
• 8c2dedfd backend/discretization: remove commented legacy/debug blocks
• 7f6eb58a backend: remove legacy nonlinear-solver wrappers and stale API
• d9c3c906 gitignore: stop tracking backend model generated kernels
• 99c0647d gitignore: stop tracking BuiltIn and Matlab Modeling directories
• 00fd9a31 update git ignore
• 9dbb4f67 repo: clean generated artifacts and tighten ignore rules
• 818392c6 examples: add 3D isoq/flared-plate/sharpb2 cases
• 9c45bd88 matlab/mesh: add extrusion/rotation/frustum utilities and connectivity diagnostics
• 092aa97f matlab: add primitive boundary-expression library and plotting helpers
• 0470211e backend/discretization: track interface-face offsets for external flux handling
• a644374b backend/postprocessing: add configurable vis outputs and new solution readers
• a236789a apps: refactor runapps with per-case logs and final status summary
• c0886b90 update postprocessing
• f71a557c Postprocessing capability

2026-01

• d902ea77 Major update and improvement

2025-12

• 1d618111 update examples
• 4e85e6ae Add MPI capability for monolithic coupled solver
• 024cf3d3 Add Fint and Fext functions to Text2Code and backend
• e38de7d1 Replace MPI_COMM_WORLD with EXASIM_COMM_WORLD
• 45f696d5 Merge branch 'master' of https://github.com/exapde/Exasim
• 874efa03 Add interface functions for coupled solver
• c1517621 Clarify Text2Code's function in README
• 125c26d0 Update README.md
• 045a8f11 Revise README with example running instructions
• d53479d0 Update README.md
• 2949cbbb Update README for installation and build instructions
• b85f6ec9 Improve section headers in README.md
• 240da389 Fix typo in Kokkos Libraries section
• 86b9ba73 Fix typo in Kokkos Libraries section
• 29c66c52 Update README with build instructions for libraries
• 5de0c5ee update workflows
• b81a2624 Major upgrades and improvements

2025-11

• 4af8514a remove redundant files
• 54f10fc3 update solution.cpp
• 34ee79ff Update restart feature
• 6e434343 Merge branch 'master' of https://github.com/exapde/Exasim
• 38f16909 update restarting feature
• c924b35e Merge branch 'master' into master
• a9f81575 update parmetis
• 6b55556b update backend/preprocessing
• 3413a8d1 update saveparaview
• c01ef61e Merge branch 'master' of https://github.com/exapde/Exasim
• 591063d2 Update parmetis.cpp
• 9ee65f41 Merge pull request #70 from exapde/paraview_vis_fix
• c7aa2b7d Write ParaView file on crash if PV visualization is enabled
• a62a15bc Merge pull request #4 from MIT-PSAAP-IV/teoc/template-exasim
• 5257751e typo
• 7ec9bd8d forgot blas; should have made a spack package
• d942153e text2 code too expensive; skipping
• a300d89f git actions are so much fun
• 28f62587 action build deps
• 13422560 try again
• 10ba0471 merge
• a4953a8a umm
• 49e50ac0 ops
• ba5ecc85 option
• 660844c7 Edit discretization.cpp and CMakeLists.txt
• 687144f1 delete redundant files
• d740cb7b Merge pull request #69 from MIT-PSAAP-IV/master
• 275a1e54 Merge pull request #3 from exapde/master
• 1fa61786 Merge branch 'master' of https://github.com/exapde/Exasim
• 452ce4a2 update parmetis
• 39f52dc3 ops
• 628314e8 workflow
• cb02b031 libmode
• 78953699 update pdeapp.txt
• bb1b8889 Update /Exasim/backend/Discretization/KokkosDrivers.cpp
• d1291f45 Merge pull request #2 from exapde/master
• 8d8bbe7a Merge pull request #68 from MIT-PSAAP-IV/master
• 412c56f9 Merge pull request #66 from exapde/visualization_fix
• cab28b7a Merge branch 'master' into visualization_fix
• a104c27c for the future
• 07642f72 history
• caee94ae builds again; mpi/cpu should probably work; need to test
• af308351 implaced template params
• a927b468 okay all funcs now
• fd4076ff i will take revenge
• 971b74b2 Updated visualization fix
• 6a4eb1e4 starting to propogate
• b220a3fe silly
• c6fd3f81 prog
• 5cf1dd1f ...
• ca7f974a ugg
• 3ad330eb Merge branch 'master' of https://github.com/exapde/Exasim
• 6e12849a Include ParMetis
• d77834cc Fixed ParaView visualization bug when executing the simulation on the GPU
• 7923b231 Merge pull request #65 from exapde/text2code_symbolic_fix
• 09f48169 Fixed return type of SymEngine math functions in text2code code generator.
• 2c06cfa1 Merge pull request #1 from exapde/master
• 2602c0af update text2code
• bba2b124 update solution class
• 178c68bf update rans/naca0012
• f26bbdb7 update readbinaryfiles
• e53f653a update dynamic AV
• 371e0c0f update solution.cpp
• `0b8...

Exasim 1.2

This release contains the following new features:

• Text2Code as a C++ code generator and preprocessors
• ILU preconditioners
• C++ visualization capabilities
• Quantity of interest calculation such as volume and face integrals of solution field or surface fluxes
• Several new examples such as linear elasticity, nonlinear elasticity, Monge-Ampere, and Stokes flows
• New shock-capturing examples for hypersonic flows

Exasim 1.1

This release contains the following new features:

• Parallel monolithic multi-physics solver
• HIP support for AMD GPUs
• Chemistry models for chemically-reacting flows
• Shock-capturing examples for hypersonic flows
• Heat transfer examples for hypersonic flows

Exasim 1.0

This release contains the following capabilities of Exasim:

• Solve a wide range of partial differential equations
• Generate stand-alone C++ production code via the mathematical expressions of the PDEs
• Implement high-order DG methods including local DG and hybridized DG methods
• Implement diagonally implicit Runge-Kutta methods
• Implement parallel Newton-GMRES solvers and scalable preconditioners
• Employ Kokkos to provide full GPU functionality for all code components from discretization schemes to iterative solvers
• Provide interfaces to Julia, Python, and Matlab.

Exasim 0.5

This release does not employ Kokkos and does not implement hybridized DG methods.

Exasim Version 0.4

This is a major release that includes the following changes:

• Restructure Exasim folders
• Automatic differentiation using Enzyme for matrix-vector products in GMRES
• Implementation of artificial viscosity in the residual evaluation
• Space weather applications
• Create unit tests

Exasim Version 0.3

Exasim Version 0.3