Exasim v1.4 (2026-02-20)

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
• 0b8bb792 update setstructs

2025-10

• 3cd89c92 update ptcsolver
• 112dacce update cmake options
• 3e3579cf update HDG
• 8ee5c812 fix a bug in setprecondstruct.cpp
• 43c74bcf update visualization
• 1a5acc84 update common
• 46c5f116 update HDG
• 44533f6b fix rvec
• 353004d4 update memory fixes
• b468aa98 Roll back backend
• 04f1330c update HDG
• 4c182700 update HDG
• 6fa2aafb update HDG
• c7e9e9a5 update HDG
• 9b5cd6a2 update HDG
• d7a4da82 update HDG
• 22f295d8 update HDG
• 89b65a5e update HDG
• 61a5b288 update HDG
• df27f442 update HDG
• 4678c598 update HDG
• f15f8f1a update solution.h
• 871acb3e Optimize HDG memory usage
• 1550f62c add nonlinear elasticity cube block example
• ad25321e Magnetic Vortex Example
• 3371a114 update pdeapp.m
• 9254388a update pdeapp.m
• 9976c61b Update preprocessing.m
• 483743ff update readxdg
• a0aff903 update readxdgmpi
• 6632f346 update postprocessing
• d08ef345 update preprocessing
• 86fa9e69 Merge pull request #64 from jvilaperez/master
• 22ec775f modifying compiler path to make it general in 2 basic examples
• a1645664 changing path for PR
• c799fb7d unifying some files for PR
• f94bb69d Merging 'upstream/master'
• 0b86784f update pdeapp
• adf829ab Update CMakeLists.txt
• 4864acc5 Update getuhat.cpp
• 10ff4f3f Update stg
• 31a558c7 problem with folder name

2025-09

• 71e22293 update preprocessing
• 79e02ddc Merge remote-tracking branch 'upstream/master' into jvp_merging
• 6fe7a16a preprocessing update to input external fields
• 26e495ae incorporating Coriolis and external field (preprocessing changes needed)
• 507d6b1c update main.cpp
• 69cb3372 update visualization.cpp
• 7f2f3c14 Merge remote-tracking branch 'upstream/master' into jvp_merging
• 2548fdd5 setup ionosphere test
• b81e1d49 RANS examples
• b18abcb7 update mkpng
• 7dd0027c update readsoldmd
• 8e67aef3 add readsoldmd
• 7b81569f update readsol
• efbe09d8 Merge branch 'master' of https://github.com/exapde/Exasim
• 4af12e7c update readsol
• 78c6da02 Create readsol.m
• d10891db zero commit
• ab36717b update readsol
• 8f3fd2b4 add readsol
• 2d2e76fe Update a flat plate example for RANS
• 7b7ad794 update NS example
• c59dd99e Implement synthetic turbulence generation and inflow boundary condition
• 9a216c7d Merge branch 'jvp_iontest' into jvp_merging
• bc8d758f Merge branch 'master' into jvp_merging
• 7b647bb1 Merge remote-tracking branch 'upstream/master'
• d0a1a46f run on Derecho
• ae853dab update gitignore
• 5967e8d4 update gitignore
• 57b4c3be Merge remote-tracking branch 'upstream/master'

2025-08

• 0fa7ad11 Merge remote-tracking branch 'upstream/master'
• f723a0a0 partial progress

2025-05

• f88e4810 Preliminary test for the ionosphere model
• 32bc6cec Merge branch 'master' into jvp_iontest
• 9e0c5ce9 cubesphere matlab
• e65114a4 Merge branch 'master' into jvp_iontest
• cde04c28 correct indentation
• c63bf096 ionosphere test
• d7b26285 mesh fix and python cubesphere
• c2035424 Merge remote-tracking branch 'upstream/master'
• e8f5ba2f Merge remote-tracking branch 'upstream/master'
• a4580188 Merge remote-tracking branch 'upstream/master'
• 5c41a5f5 updates before merge
• e77b24ba gitignore update
• 5a329804 gitignore update
• b6b0fb77 gitignore changes
• 77805a7f updating install