nbrucy
May 20, 2026
Maintainer

Changelog: Ramses 2026

Summary

Users

A lot of performance improvements on the hydro kernels (by @tinecolman) and the sink particles (by @georgesabboudeh)
Many bugs were fixed (by @Martin-Rey, @tinecolman, @nbrucy, @Sadanari0614, @jokirosdahl, @cosmos-in-us, @robelgeda, @James11222, @bcommerc, @Adnan-Ali-Ahmad)
A new utilitary to write grafic-style input files (by @tinecolman)
It is now possible to select both analytical forces with the poisson solver (by @simonb282)
It is now possible to output conservative instead of primitive hydro variables (by @tinecolman)
The EOS were improved (by @tinecolman)
There is now an option to have output at exact time (by @wzzhang97). ⚠️ Use with care ⚠️
The documentation was improved (by @nbrucy and @georgesabboudeh)

Developers

We have a new documentation for developers following the first Ramses dev school. Discover it here (by the SNO's Developer school working group, @tinecolman, @blaizot @nbrucy @mtrebitsch, @cphyc and @jokirosdahl)
A lot of new tests were added, including crossing beams, stromgren2D, RT dirac, Ponomarenko by @matthiasglz, restart and improved SOD test by @nbrucy, refinement test by @bcommerc, clumpfinfer, star formation and SN feedback tests by @pocvirk, cosmo amr and 1D advection tests by @tinecolman, and movie and chemistry tests by @jokirosdahl. This is the results of the SNO's test working group.
The code quality was improved (by @tinecolman and @mtrebitsch). The biggest changes are in how the parameters are read.
The tests results are now displayed directly as a comment in the PR (by @nbrucy)

Detailled changes

🎉 New features

Python to RAMSES input through grafic files + test by @tinecolman in Python to RAMSES input through grafic files + test #232
More flexible gravity sources by @simonb282 in More flexible gravity sources #153
Option to output conservative instead of primitive hydro variables by @tinecolman in Option to output conservative instead of primitive hydro variables #230
Add EOS for 2nd collapse setups + some general EOS improvements by @tinecolman in Add EOS for 2nd collapse setups + some general EOS improvements #257
Add optional exact output time control by @wzzhang97 in Add optional exact output time control #258

🚀 Performance improvements

[SPACE] Optimize and document nbor utils by @tinecolman in [SPACE] Optimize and document nbor utils #108
Optimized the creation of cloud particles by @georgesabboudeh in Optimized the creation of cloud particles #140
Optimize ctoprim by @tinecolman in Optimize ctoprim #158
Refactor and optimize uslope by @tinecolman in Refactor and optimize uslope #154
optimizations for hydro solver on uniform grid by @tinecolman in optimizations for hydro solver on uniform grid #159
Call uslope inside trace by @tinecolman in Call uslope inside trace #205

🐞 Bugs

Remove hard cast of idp to short int by @Martin-Rey in Remove hard cast of idp to short int #117
Fix bug in phi_fine_cg.f90 by @bcommerc in Fix bug in phi_fine_cg.f90 #137
set npartmax to 0 if pic is false by @nbrucy in set npartmax to 0 if pic is false #150
Fix nlevelmax_sink not working as intended by @tinecolman in Fix nlevelmax_sink not working as intended #151
Fix incorrect T2min calculation in cooling_fine.f90 when jeans_ncells > 0 by @cosmos-in-us in Fix incorrect T2min calculation in cooling_fine.f90 when jeans_ncells > 0 #148
Correction of bugs in condinit_kind='collapse' by @matthiasglz in Correction of bugs in condinit_kind='collapse' #177
update dice patch by @tinecolman in update dice patch #172
Updated patch files to reflect changes in main code by @jokirosdahl in Updated patch files to reflect changes in main code #180
use buildinfo in read_params of the dice patch by @robelgeda in use buildinfo in read_params of the dice patch #192
Fix amr2cube routine in utils by @nbrucy in Fix amr2cube routine in utils #195
changed the default load-in in amr/init_time.f90 from deltab to velcx… by @James11222 in changed the default load-in in amr/init_time.f90 from deltab to velcx… #249
correct a bug in the lightcone module by @tinecolman in correct a bug in the lightcone module #250
Fix galic util and update merger patch by @tinecolman in Fix galic util and update merger patch #242
Minor bugfix: fix invalid access to sinks arrays by @nbrucy in Minor bugfix: fix invalid access to sinks arrays #260
bugfix threshold accretion by @nbrucy in bugfix threshold accretion #261
Fix non-convergence in the H2 fraction for zero-metallicity gas by @jokirosdahl in Fix non-convergence in the H2 fraction for zero-metallicity gas #262
Correct H- formation rate coefficient tbl_alphaGP_H2%rates by @Sadanari0614 in Correct H- formation rate coefficient tbl_alphaGP_H2%rates #266
Cache the namelist file on startup by @Adnan-Ali-Ahmad in Cache the namelist file on startup #268

🧪 Test Cases

Add a RT stromgren2d test with He ionization by @matthiasglz in Add a RT stromgren2d test with He ionization #122
[tests] Add a -r option to test restart by @nbrucy in [tests] Add a -r option to test restart #110
Add Sedov and geometry refine test by @bcommerc in Add Sedov and geometry refine test #124
[tests] solve bug where execution test log was not written by @nbrucy in [tests] solve bug where execution test log was not written #125
Add a RT crossing beams test by @matthiasglz in Add a RT crossing beams test #126
[tests] fix small values being rounded to 0 by visu_ramses by @tinecolman in [tests] fix small values being rounded to 0 by visu_ramses #127
[tests] Update stromgren2d test with the inclusion of molecular hydrogen and fixed compilation error when compiling without MPI by @jokirosdahl in [tests] Update stromgren2d test with the inclusion of molecular hydrogen and fixed compilation error when compiling without MPI #136
[tests] adjust outputting for sedov3d test to work with test restart mechanism by @tinecolman in [tests] adjust outputting for sedov3d test to work with test restart mechanism #134
[tests] remove levelhack tests and put its changes to the bondi test by @tinecolman in [tests] remove levelhack tests and put its changes to the bondi test #135
[tests] Check SOD tests against analytical solution by @nbrucy in [tests] Check SOD tests against analytical solution #129
prevent cosmo ic download from hanging when the website is down by @tinecolman in prevent cosmo ic download from hanging when the website is down #139
[tests] Add collapse test for MHD by @bcommerc in [tests] Add collapse test for MHD #130
[tests] Added a check for the clumpfinder by @pocvirk in [tests] Added a check for the clumpfinder #132
[tests] adjust tolerance for median error in tube tests by @tinecolman in [tests] adjust tolerance for median error in tube tests #145
regenerate reference solution for stellar-HII with 2 cpus by @tinecolman in regenerate reference solution for stellar-HII with 2 cpus #160
Movie test by @jokirosdahl in Movie test #146
[tests] Do a parameter study in the sod-tube analytical test by @nbrucy in [tests] Do a parameter study in the sod-tube analytical test #141
Improvements to parameter sweep of sod-tube test by @tinecolman in Improvements to parameter sweep of sod-tube test #165
Add 1D advection test by @tinecolman in Add 1D advection test #166
fix Cosmo test fails to stop when testing with restart Cosmo test fails to stop when testing with restart #167 by @nbrucy in fix Cosmo test fails to stop when testing with restart #167 #168
change slope_type in imhd-tube and imhd-tube-nener tests by @tinecolman in change slope_type in imhd-tube and imhd-tube-nener tests #169
[Test suite] Improvements to testing restarts by @tinecolman in [Test suite] Improvements to testing restarts #194
[Tests] New tests for the equilibrium and non-equilibrium cooling module by @jokirosdahl in [Tests] New tests for the equilibrium and non-equilibrium cooling module #191
[tests] Add MHD Ponomarenko dynamo test by @matthiasglz in [tests] Add MHD Ponomarenko dynamo test #131
[tests] RT dirac test by @matthiasglz in [tests] RT dirac test #133
Add ABC-flow dynamo test by @matthiasglz in Add ABC-flow dynamo test #201
added star formation and SN feedback test by @pocvirk in added star formation and SN feedback test #198
Add a solver parameter study in the imhd test by @matthiasglz in Add a solver parameter study in the imhd test #219
Add support of bisection decomposition in the test suite by @matthiasglz in Add support of bisection decomposition in the test suite #220
Added sfvirial=true sfmodel=0 test by @pocvirk in Added sfvirial=true sfmodel=0 test #241

🛠️ CI

Deactivate auto fix by @cphyc in Deactivate auto fix #142
Update tests workflow to always run tests + other CI fixes by @nbrucy in Update tests workflow to always run tests + other CI fixes #221
CI improvement: add a comment with the link towards tests results by @nbrucy in CI improvement: add a comment with the link towards tests results #222
[CI] Remove commit status actions from post-pr workflow by @nbrucy in [CI] Remove commit status actions from post-pr workflow #225

🧹 Code Quality

Directly store the flux in cmpflxm instead of using intermediate arrays fx and tx by @tinecolman in Directly store the flux in cmpflxm instead of using intermediate arrays fx and tx #147
Adding missing commas between descriptors in init_turb.f90 by @mtrebitsch in Adding missing commas between descriptors in init_turb.f90 #176
combine the hydro and mhd versions of init_flow_fine.f90 into one by @tinecolman in combine the hydro and mhd versions of init_flow_fine.f90 into one #174
Combine hydro, mhd and rhd versions of hydro_parameters.f90 by @tinecolman in Combine hydro, mhd and rhd versions of hydro_parameters.f90 #184
Combine hydro and mhd versions of output_hydro.f90 by @tinecolman in Combine hydro and mhd versions of output_hydro.f90 #183
Overhaul of compiler flags in Makefile by @tinecolman in Overhaul of compiler flags in Makefile #185
move build variables to a module by @tinecolman in move build variables to a module #190
Combine the hydro and mhd version of init_hydro.f90 by @tinecolman in Combine the hydro and mhd version of init_hydro.f90 #203
Collection of minor fixes and cleanups by @tinecolman in Collection of minor fixes and cleanups #212

📚 Documentation

Remove references to the stable branch in the doc by @nbrucy in Remove references to the stable branch in the doc #144
further document the order of hydro variables by @tinecolman in further document the order of hydro variables #178
Documentation improvements (add missing links) by @nbrucy in Documentation improvements (add missing links) #209
Improve code comments by @nbrucy in Improve code comments #252
Added documentation for (cloud_pts_check) by @georgesabboudeh in Added documentation for (cloud_pts_check) #256
Add a documentation for developers by @nbrucy in Add a documentation for developers #228

New Contributors

@Martin-Rey made their first contribution in Remove hard cast of idp to short int #117
@bcommerc made their first contribution in Add Sedov and geometry refine test #124
@cosmos-in-us made their first contribution in Fix incorrect T2min calculation in cooling_fine.f90 when jeans_ncells > 0 #148
@mtrebitsch made their first contribution in Adding missing commas between descriptors in init_turb.f90 #176
@georgesabboudeh made their first contribution in Optimized the creation of cloud particles #140
@James11222 made their first contribution in changed the default load-in in amr/init_time.f90 from deltab to velcx… #249
@simonb282 made their first contribution in More flexible gravity sources #153
@wzzhang97 made their first contribution in Add optional exact output time control #258
@Sadanari0614 made their first contribution in Correct H- formation rate coefficient tbl_alphaGP_H2%rates #266
@Adnan-Ali-Ahmad made their first contribution in Cache the namelist file on startup #268

Full Changelog: 2025.05...2026_05

This discussion was created from the release 2026.05.

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