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<HTML>
<CENTER><A HREF = "index.html">SPARTA WWW Site</A>
</CENTER>
<HR>
<H3>Latest Features and Bug Fixes in SPARTA
</H3>
<P>This page is a continuous listing of new features and bug fixes for
the SPARTA simulator.
</P>
<P>In some cases, new features change the syntax or operation of an
existing input script command, which can cause SPARTA output to
change, or even "break" an earlier working script. These cases are
highlighted below with a "BACKWARD COMPATIBILITY" note.
</P>
<P>To stay up-to-date with the current SPARTA, you can download the
current tarball from the <A HREF = "https://sjplimp.github.io/download.html">download page</A> at any time, and
re-build the code. It will include all the features/fixes listed
below.
</P>
<HR>
<H4><A NAME = "version"></A>What version of SPARTA do you have?
</H4>
<P>A SPARTA "version" is the date when it was released, such as 10 Aug
2014. SPARTA is updated continuously. Every time we fix a bug or add
a feature, we release it immediately, as listed below. Each dated
copy of SPARTA contains all the features and bug-fixes up to and
including that version date. The version date is printed to the
screen and logfile every time you run SPARTA. It is also in the file
src/version.h and in the SPARTA directory name created when you unpack
a tarball.
</P>
<UL><LI>If you browse the HTML or PDF doc pages on the SPARTA WWW site, they
always describe the most current version of SPARTA.
<LI>If you browse the HTML or PDF doc pages included in your tarball, they
describe the version you have.
</UL>
<P>Note that you can download tarballs of previous SPARTA releases, going
back several years, from the <A HREF = "https://github.com/sparta/sparta">SPARTA GitHub
website</A>. See the "Releases" box on
the rightside of the page and open the "Assets" tab of any release
entry. Likewise if you have a git clone of the SPARTA repository, you
can type "git tag" to see the list of releases and and do a "git
checkout" of any of them.
</P>
<HR>
<HR>
<P><B>24 Sep 2025</B>
</P>
<P>Details on what changed in this release are
<A HREF = "https://github.com/sparta/sparta/releases/tag/24Sep2025">here</A>
</P>
<P>Details for all releases are
<A HREF = "https://github.com/sparta/sparta/releases">here</A>
</P>
<P>This release fixes some issues from the 10Sep2025 release (and
before).
</P>
<HR>
<P><B>10 Sep 2025</B>
</P>
<P>Details on what changed in this release are
<A HREF = "https://github.com/sparta/sparta/releases/tag/10Sep2025">here</A>
</P>
<P>Details for all releases are
<A HREF = "https://github.com/sparta/sparta/releases">here</A>
</P>
<P>Only new features or notable changes are highlighted here:
</P>
<UL><LI>Add <A HREF = "https://sparta.github.io/doc/dump_modify.html">dump_modify</A>
"gridgroup" and "surfgroup" keywords to
<A HREF = "https://sparta.github.io/doc/dump_image.html">dump_image</A> by Steve
Plimpton (SNL retired) in <A HREF = "https://github.com/sparta/sparta/pull/547">PR
#547</A>
<LI>Add <A HREF = "https://sparta.github.io/doc/fix_emit_face.html">fix emit/face</A>
"modulate" option for insertion of time-varying flows by Steve
Plimpton (SNL retired) in <A HREF = "https://github.com/sparta/sparta/pull/551">PR
#551</A>
<LI>Add "is_file()" special function for
<A HREF = "https://sparta.github.io/doc/variable.html">variables</A> by Stan Moore
(SNL) in <A HREF = "https://github.com/sparta/sparta/pull/558">PR #558</A>
<LI>Add python support via a new
<A HREF = "https://sparta.github.io/doc/python.html">python</A> command and
<A HREF = "https://sparta.github.io/doc/variable.html">python-style variables</A> by
Steve Plimpton (SNL retired) in <A HREF = "https://github.com/sparta/sparta/pull/564">PR
#564</A>
<LI>Reduce particle memory use by 25% by Matt Bettencourt (NVIDIA) in <A HREF = "https://github.com/sparta/sparta/pull/567">PR
#567</A>
<LI>Add new <A HREF = "https://sparta.github.io/doc/fix_custom.html">fix custom</A>
command along with new
<A HREF = "https://sparta.github.io/doc/custom.html">custom</A> command options by
Steve Plimpton (SNL retired) in <A HREF = "https://github.com/sparta/sparta/pull/550">PR #550</A>
<LI>Add options to the
<A HREF = "https://sparta.github.io/doc/create_particles.html">create_particles</A>
command to use <A HREF = "https://sparta.github.io/doc/custom.html">custom</A>
per-grid attributes for created particles by Steve Plimpton (SNL
retired) in <A HREF = "https://github.com/sparta/sparta/pull/554">PR #554</A>
<LI>Add tallying for individual gas and surface collisions and reactions
by Steve Plimpton (SNL retired) in <A HREF = "https://github.com/sparta/sparta/pull/405">PR
#405</A>
</UL>
<HR>
<P><B>20 Jan 2025</B>
</P>
<P>Details on what changed in this release are
<A HREF = "https://github.com/sparta/sparta/releases/tag/20Jan2025">here</A>
</P>
<P>Details for all releases are
<A HREF = "https://github.com/sparta/sparta/releases">here</A>
</P>
<P>Only new features or notable changes are highlighted here:
</P>
<UL><LI>Improved explicit to implicit surface conversion in <A HREF = "doc/create_isurf.html">create
isurf</A> command and added a new multi-point decrement for
DSMC ablation in <A HREF = "doc/fix_ablate.html">fix ablate</A> by Andrew Hong (SNL) in <A HREF = "https://github.com/sparta/sparta/pull/495">PR
#495</A>
<LI>More accurate mean free path and new mean collision time in <A HREF = "doc/compute_lambda_grid.html">compute
lambda/grid</A> by Arnaud Borner (NASA Ames) in <A HREF = "https://github.com/sparta/sparta/pull/282">PR
#282</A>
<LI>New <A HREF = "doc/compute_surf.html">compute surf</A> torque option by Steve Plimpton (SNL
retired) and Darrell Robertson (NASA Ames) in <A HREF = "https://github.com/sparta/sparta/pull/517">PR
#517</A>
<LI>Added <A HREF = "doc/fix_halt.html">fix halt</A> which can be used to stop a
simulation early based on a user-specified criteria, copied and
adapted from LAMMPS by Stan Moore (SNL) in <A HREF = "https://github.com/sparta/sparta/pull/524">PR
#524</A>
<LI>Use mean collision time in <A HREF = "doc/compute_lambda_grid.html">compute lambda/grid</A>
for variable timestepping in <A HREF = "doc/compute_dt_grid.html">compute dt/grid</A> by Alan
Stagg (SNL) in <A HREF = "https://github.com/sparta/sparta/pull/540">PR #540</A>
</UL>
<P>BACKWARD COMPATIBILITY: The syntax for <A HREF = "doc/compute_lambda_grid.html">compute lambda/grid</A> changed slightly.
</P>
<HR>
<P><B>4 Sep 2024</B>
</P>
<P>Details on what changed in this release are
<A HREF = "https://github.com/sparta/sparta/releases/tag/4Sep2024">here</A>
</P>
<P>Details for all releases are
<A HREF = "https://github.com/sparta/sparta/releases">here</A>
</P>
<P>Only new features or notable changes are highlighted here:
</P>
<UL><LI>Added <A HREF = "doc/create_isurf.html">create_isurf</A> command to convert explicit
surfaces to implicit surfaces by Andrew Hong (SNL) in <A HREF = "https://github.com/sparta/sparta/pull/447">PR
#447</A>
<LI>Added custom per-surf options to <A HREF = "doc/fix_emit_surf.html">fix
emit/surf</A> command by Steve Plimpton (SNL
retired) in <A HREF = "https://github.com/sparta/sparta/pull/491">PR #491</A>
<LI>Modified small corner value removal in
<A HREF = "doc/fix_ablate.html">fix_ablate</A> command by Andrew Hong (SNL) in <A HREF = "https://github.com/sparta/sparta/pull/463">PR
#463</A>
<LI>Added a <A HREF = "doc/variable.html">variable special function</A> which allows
particle-style variables to access per-grid quantities by Steve
Plimpton (SNL retired) in <A HREF = "https://github.com/sparta/sparta/pull/511">PR
#511</A>
<LI>Added momentum and energy contributions tallied by <A HREF = "doc/fix_emit_surf.html">fix
emit/surf</A> in the results of "compute surf" by
Zak Echo (SNL) in <A HREF = "https://github.com/sparta/sparta/pull/502">PR #502</A>
</UL>
<P>BACKWARD COMPATIBILITY: SPARTA now requires a C++11 compatible compiler
(KOKKOS package requires C++17).
</P>
<HR>
<P><B>7 Mar 2024</B>
</P>
<P>Details on what changed in this release are
<A HREF = "https://github.com/sparta/sparta/releases/tag/7Mar2024">here</A>
</P>
<P>Details for all releases are
<A HREF = "https://github.com/sparta/sparta/releases">here</A>
</P>
<P>Only new features or notable changes are highlighted here:
</P>
<UL><LI>Add <A HREF = "doc/fix_dt_reset.html">global variable time stepping</A> capability
by Alan Stagg (SNL) in <A HREF = "https://github.com/sparta/sparta/pull/385">PR
#385</A>
<LI>Enhance functionality of <A HREF = "doc/custom.html">custom attributes</A> for
particles, grid cells, and surface elements by Steve Plimpton (SNL
retired) in <A HREF = "https://github.com/sparta/sparta/pull/428">PR #428</A>
<LI>Add Kokkos support for <A HREF = "doc/compute_fft_grid.html">FFTs</A> by James
Almgren-Bell (UT Austin), Sam Mish (UC Davis), and Stan Moore (SNL) in
<A HREF = "https://github.com/sparta/sparta/pull/451">PR #451</A>
<LI>Port global and prob <A HREF = "doc/surf_react.html">surface reactions</A> to Kokkos
by Stan Moore (SNL) in <A HREF = "https://github.com/sparta/sparta/pull/396">PR
#396</A>
<LI>Add an option to <A HREF = "doc/compute_surf.html">compute surf</A> to compute the
chemical energy due to catalytic surface reactions by Arnaud Borner
(NASA Ames) in <A HREF = "https://github.com/sparta/sparta/pull/278">PR #278</A>
<LI>TCE chemistry enhancement (new option) + option to compute chemistry
rates without performing reaction by Arnaud Borner (NASA Ames) and
Mitchell Gosma (UIUC) in <A HREF = "https://github.com/sparta/sparta/pull/279">PR
#279</A>
<LI>Extend the <A HREF = "doc/dump.html">dump surf</A> command with the option to dump
the area of surface elements to file by Tim Teichmann (KIT) in <A HREF = "https://github.com/sparta/sparta/pull/438">PR
#438</A>
<LI>Introduce "nflux_incident" and "mflux_incident" to the
<A HREF = "doc/compute_surf.html">compute_surf</A> command by Tim Teichmann (KIT,
ITEP): in <A HREF = "https://github.com/sparta/sparta/pull/416">PR #416</A>
<LI>Add variable Np support to the <A HREF = "doc/fix_emit_surf.html">fix emit/surf</A>
command by Steve Plimpton (SNL retired) in <A HREF = "https://github.com/sparta/sparta/pull/409">PR
#409</A>
<LI>Do not emit particles in cells that are outside of the flow volume by
Tim Teichmann (KIT) in <A HREF = "https://github.com/sparta/sparta/pull/431">PR
#431</A>
</UL>
<P>BACKWARD COMPATIBILITY: The format of stored info in restart files
changed with the enhancement of custom attributes. Thus this version
of the code cannot read older restart files, and vice versa.
</P>
<HR>
<P><B>13 Apr 2023</B>
</P>
<P>Details on what changed in this release are
<A HREF = "https://github.com/sparta/sparta/releases/tag/13Apr2023">here</A>
</P>
<P>Details for all releases are
<A HREF = "https://github.com/sparta/sparta/releases">here</A>
</P>
<P>Only new features or notable changes are highlighted here:
</P>
<UL><LI>Added optimized particle move algorithm with <A HREF = "doc/global.html">global
optmove</A> setting, Alan Stagg (SNL), <A HREF = "https://github.com/sparta/sparta/pull/156">PR
#156</A>
<LI>Implemented a variable surface temperature model based on the
re-radiative equilibrium law, as <A HREF = "doc/fix_surf_temp.html">fix
surf/temp</A> command, Arnaud Borner (NASA Ames),
<A HREF = "https://github.com/sparta/sparta/pull/277">PR #277</A>
<LI>Moved ParaView unit and integration tests under SPARTA CI using CMake,
Tom Otahal (SNL), <A HREF = "https://github.com/sparta/sparta/pull/347">PR #347</A>
<LI>Added support for Python3, Stefan Fechter (DLR), <A HREF = "https://github.com/sparta/sparta/pull/355">PR
#355</A>, <A HREF = "https://github.com/sparta/sparta/pull/392">PR
#392</A>
<LI>Optimized Kokkos package, Stan Moore (SNL), <A HREF = "https://github.com/sparta/sparta/pull/357">PR
#357</A>, <A HREF = "https://github.com/sparta/sparta/pull/401">PR
#401</A>
<LI>Added support for custom per-grid data in the form of integer/double
vectors/arrays, Steve Plimpton, <A HREF = "https://github.com/sparta/sparta/pull/358">PR
#358</A>
<LI>Updated Kokkos library version bundled with SPARTA, Stan Moore (SNL),
<A HREF = "https://github.com/sparta/sparta/pull/367">PR #367</A>, <A HREF = "https://github.com/sparta/sparta/pull/394">PR
#394</A>
<LI>Refactored and improved <A HREF = "doc/Section_howto.html#howto_16">Paraview
documentation</A>, Thomas Otahal (SNL),
<A HREF = "https://github.com/sparta/sparta/pull/369">PR #369</A>
<LI>Added argon shock tube example, Jenny Horing and Marisa Petrusky (CU
Boulder), <A HREF = "https://github.com/sparta/sparta/pull/376">PR #376</A>
<LI>Enabled the <A HREF = "doc/create_particles.html">create_particles</A> command to
insert particles in cut and split cells which are overlapped by
surface elements, Steve Plimpton, <A HREF = "https://github.com/sparta/sparta/pull/381">PR
#381</A>
<LI>Enabled particle/reorder without collisions, Stan Moore (SNL), <A HREF = "https://github.com/sparta/sparta/pull/389">PR
#389</A>
</UL>
<HR>
<P><B>18 Jul 2022</B>
</P>
<P>Details on what changed in this release are
<A HREF = "https://github.com/sparta/sparta/releases/tag/18Jul2022">here</A>
</P>
<P>Details for all releases are
<A HREF = "https://github.com/sparta/sparta/releases">here</A>
</P>
<P>Only new features or notable changes are highlighted here:
</P>
<UL><LI>Update of Kokkos library version bundled with SPARTA, Stan Moore
(SNL), <A HREF = "https://github.com/sparta/sparta/pull/353">PR #353</A>, <A HREF = "https://github.com/sparta/sparta/pull/345">PR
#345</A>
<LI>New compute surf options, Steve Plimpton (SNL), <A HREF = "https://github.com/sparta/sparta/pull/344">PR
#344</A>
<LI>New averaging option for fix temp/rescale, Steve Plimpton (SNL), <A HREF = "https://github.com/sparta/sparta/pull/334">PR
#334</A>
<LI>Surf_collide specular no-slip option, Michael Gallis (SNL), <A HREF = "https://github.com/sparta/sparta/pull/324">PR
#324</A>
<LI>Surf_collide adiabatic model with isotropic scattering, Tim Teichmann
(KIT) <A HREF = "https://github.com/sparta/sparta/pull/329">PR #329</A>
</UL>
<HR>
<P><B>7 Jan 2022</B>
</P>
<P>Details on what changed in this release are
<A HREF = "https://github.com/sparta/sparta/releases/tag/7Jan2022">here</A>
</P>
<P>Details for all releases are
<A HREF = "https://github.com/sparta/sparta/releases">here</A>
</P>
<P>Only new features or notable changes are highlighted here:
</P>
<UL><LI>Update restart file to store all global options (<A HREF = "https://github.com/sparta/sparta/pull/316">PR
#316</A>), Stan Moore (SNL)
<LI>Add fix temp/global/rescale command to use as a global thermostat on
the temperature of the entire system (<A HREF = "https://github.com/sparta/sparta/pull/314">PR
#314</A>), Steve Plimpton (SNL)
<LI>Generalize surf collide rotation check to axisymmetric (<A HREF = "https://github.com/sparta/sparta/pull/311">PR
#311</A>), Steve Plimpton (SNL)
<LI>Allow Kokkos surf_collide_diffuse to use fixes with custom data (<A HREF = "https://github.com/sparta/sparta/pull/310">PR
#310</A>), Stan Moore (SNL)
<LI>Allow the maximum number or discrete vibrational modes to be extended
(<A HREF = "https://github.com/sparta/sparta/pull/307">PR #307</A>), Steve Plimpton
(SNL)
<LI>Add Kokkos version of fix ambipolar (<A HREF = "https://github.com/sparta/sparta/pull/304">PR
#304</A>), Stan Moore (SNL)
<LI>Add more general external fields (<A HREF = "https://github.com/sparta/sparta/pull/303">PR
#303</A>), Steve Plimpton (SNL)
<LI>Allow continuous rotational DOFs = 3 for complex molecular species
(<A HREF = "https://github.com/sparta/sparta/pull/301">PR #301</A>), Steve Plimpton
(SNL)
<LI>Update Kokkos library in SPARTA to v3.5.0 (<A HREF = "https://github.com/sparta/sparta/pull/300">PR
#300</A>), Stan Moore (SNL)
<LI>Enhancements to the Sparta ParaView tools to allow processing of very
large refined grids in parallel (<A HREF = "https://github.com/sparta/sparta/pull/299">PR
#299</A>), Thomas Otahal (SNL)
<LI>Add subset option to compute reduce (<A HREF = "https://github.com/sparta/sparta/pull/297">PR
#297</A>), Steve Plimpton (SNL)
<LI>Add fix temp/rescale command for thermostatting (<A HREF = "https://github.com/sparta/sparta/pull/296">PR
#296</A>), Steve Plimpton (SNL)
<LI>Add Exodus 2 format output to surf2paraview.py (<A HREF = "https://github.com/sparta/sparta/pull/295">PR
#295</A>), Thomas Otahal (SNL)
<LI>Enable reaction tallying in computes for on-surface reactions (<A HREF = "https://github.com/sparta/sparta/pull/294">PR
#294</A>), Steve Plimpton (SNL)
<LI>Add nflux to compute_boundary and compute_surf commands (<A HREF = "https://github.com/sparta/sparta/pull/293">PR
#293</A>), Tim Teichmann (ITEP,
KIT)
</UL>
<P>BACKWARD COMPATIBILITY: The format of stored info in restart files
changed with the addition of global options. Thus this version of the
code cannot read older restart files, and vice versa.
</P>
<HR>
<P><B>20 Oct 2021</B>
</P>
<P>Details on what changed in this release are
<A HREF = "https://github.com/sparta/sparta/releases/tag/20Oct2021">here</A>
</P>
<P>Details for all releases are
<A HREF = "https://github.com/sparta/sparta/releases">here</A>
</P>
<P>Only new features or notable changes are highlighted here:
</P>
<UL><LI>Improve scalability of surf2grid algorithm for the persurf case (<A HREF = "https://github.com/sparta/sparta/pull/241">PR
#241</A>), Steve Plimpton (SNL)
<LI>Insure cut/split cell calculations work robustly when round-off issues
arise (<A HREF = "https://github.com/sparta/sparta/pull/244">PR #244</A>), Steve
Plimpton (SNL)
<LI>Add Kokkos support for tvib and custom per-particle attributes (fix
vibmode, compute tvib/grid) (<A HREF = "https://github.com/sparta/sparta/pull/251">PR
#251</A>), Stan Moore (SNL)
<LI>Allow Kokkos SPARTA to compile with the AMD HIP backend (<A HREF = "https://github.com/sparta/sparta/pull/255">PR
#255</A>), Stan Moore (SNL)
<LI>Update Kokkos library in SPARTA to v3.4.1 (<A HREF = "https://github.com/sparta/sparta/pull/256">PR
#256</A>), Stan Moore (SNL)
<LI>Change RNG in SPARTA from Park to Knuth algorithm (aka ran3 in
Numerical Recipes book) (<A HREF = "https://github.com/sparta/sparta/pull/266">PR
#266</A>), Michael Gallis
(SNL), Arnaud Borner (NASA), Stan Moore (SNL)
<LI>Fix issue with temperature varying rotational relaxation not
maintaining equilibrium at steady state (<A HREF = "https://github.com/sparta/sparta/pull/268">PR
#268</A>), Zakari Eckert (SNL)
<LI>Add nsplit to dump_grid command (<A HREF = "https://github.com/sparta/sparta/pull/272">PR
#272</A>), Tim Teichmann (KIT)
<LI>Add a surf_react adsorb model which allows for species to adsorb on
the surface and surface elements (or box faces) to store state about
what is adsorbed, which affects future reactions (<A HREF = "https://github.com/sparta/sparta/pull/128">PR
#128</A> and <A HREF = "https://github.com/sparta/sparta/pull/291">PR
#291</A>), Krishnan Gopalan
(NASA Ames) and Steve Plimpton (SNL)
<LI>Add grid-style variable option to fix ablate (<A HREF = "https://github.com/sparta/sparta/pull/292">PR
#292</A>), Steve Plimpton
</UL>
<P>BACKWARD COMPATIBILITY: The global surfpush command was removed.
Because the random number generator changed, simulations with this
versions will not exactly reproduce old simulations.
</P>
<P>This is the <A HREF = "patches/files.20Oct21">list of changed files</A> versus the
26Feb21 version.
</P>
<HR>
<P><B>26 Feb 2021</B>
</P>
<P>Details on what changed in this release are
<A HREF = "https://github.com/sparta/sparta/releases/tag/26Feb2021">here</A>
</P>
<P>Details for all releases are
<A HREF = "https://github.com/sparta/sparta/releases">here</A>
</P>
<P>Only new features or notable changes are highlighted here:
</P>
<UL><LI>Added new radius/only cell weighting mode for axisymmetric
simulations. See the <A HREF = "global.html">global weight</A> command. <A HREF = "https://github.com/sparta/sparta/pull/211">PR
#211</A> and <A HREF = "https://github.com/sparta/sparta/pull/236">PR
#236</A>
<LI>Extended the <A HREF = "global.html">global mem/limit</A> command to also work for
acquiring ghost cells. <A HREF = "https://github.com/sparta/sparta/pull/220">PR
#220</A>
<LI>Updated the Kokkos library bundled with SPARTA. <A HREF = "https://github.com/sparta/sparta/pull/230">PR
#230</A>
<LI>Updated the grid2paraview.py tool to read new grid file format that
does not have parent information (Tom Otahal, SNL), <A HREF = "https://github.com/sparta/sparta/pull/212">PR
#212</A>
<LI>Various other small bugfixes since the last patch
</UL>
<P>This is the <A HREF = "patches/files.26Feb21">list of changed files</A> versus the
20Nov20 version.
</P>
<HR>
<P><B>20 Nov 2020</B>
</P>
<P>Details on what changed in this release are
<A HREF = "https://github.com/sparta/sparta/releases/tag/20Nov2020">here</A>
</P>
<P>Details for all releases are
<A HREF = "https://github.com/sparta/sparta/releases">here</A>
</P>
<P>Only new features or notable changes are highlighted here:
</P>
<UL><LI>Removed parent cells from the data structures used to store the
logical structure of the hierarchical grid used in SPARTA. Each
processor now stores only the child cells it owns (plus ghost child
cells). For large grids with many levels of adaptation this reduces
the memory cost significantly, since previously each processor stored
a copy of all the parent cells. <A HREF = "https://github.com/sparta/sparta/pull/192">PR
#192</A>
<LI>Distributed explicit surfaces can now be used with grid adaptation,
via the <A HREF = "doc/adapt_grid.html">adapt_grid</A> and <A HREF = "doc/fix_adapt.html">fix
adapt</A> commands. <A HREF = "https://github.com/sparta/sparta/pull/192">PR
#192</A>
<LI>The <A HREF = "doc/global.html">global cellmax</A> command was removed, since it is
no longer needed. The algorithm that used it for mapping surface
elements to grid cells was reformulated since it previously relied on
parent cells. <A HREF = "https://github.com/sparta/sparta/pull/192">PR
#192</A>
<LI>Added interspecies collision parameters (Ed Piekos, SNL), <A HREF = "https://github.com/sparta/sparta/pull/28">PR
#28</A>
<LI>Added CTest and CDash support (Evan Harvery, SNL), <A HREF = "https://github.com/sparta/sparta/pull/177">PR
#177</A>
</UL>
<P>BACKWARD COMPATIBILITY: The format of stored info in restart files
changed with the removal of parent cells. Thus this version of the
code cannot read older restart files, and vice versa.
</P>
<P>This is the <A HREF = "patches/files.20Nov20">list of changed files</A> versus the
6Jul20 version.
</P>
<HR>
<P><B>6 Jul 2020</B>
</P>
<P>Details on what changed in this release are
<A HREF = "https://github.com/sparta/sparta/releases/tag/6Jul2020">here</A>
</P>
<P>Details for all releases are
<A HREF = "https://github.com/sparta/sparta/releases">here</A>
</P>
<P>Only new features or notable changes are highlighted here:
</P>
<UL><LI>Enabled use of the ambipolar model with recombination reactions.
Includes a refactoring of group-based collisions, with or without the
ambiopolar model. See <A HREF = "https://github.com/sparta/sparta/pull/159">PR
#159</A>
<LI>Option to build SPARTA via CMake. See <A HREF = "https://github.com/sparta/sparta/pull/155">PR
#155</A>
<LI>Fixed some issues with reading/writing of restart files in low-memory
mode. See <A HREF = "https://github.com/sparta/sparta/pull/161">PR #161</A>
<LI>Fixed a bug with the compute tvib/grid command. See <A HREF = "https://github.com/sparta/sparta/pull/165">PR
#165</A>
</UL>
<P>This is the <A HREF = "patches/files.6Jul20">list of changed files</A> versus the
7May20 version.
</P>
<HR>
<P><B>7 May 2020</B>
</P>
<P>These are the updates in this release:
</P>
<UL><LI>Allow use of restart files larger than 2 GB.
<LI>Kokkos versions of the <A HREF = "doc/compute_property_grid.html">compute
property/grid</A> and <A HREF = "doc/compute_distsurf_grid.html">compute
distsurf/grid</A> comands.
<LI>Updated ParaView visualization scripts.
<LI>Various small bug fixes, mostly with recently added features.
</UL>
<P>NOTE: This release breaks restart file backwards compatibility, so an
old restart file created by a previous version of the code cannot be
used by the current code version.
</P>
<P>This is the <A HREF = "patches/files.7May20">list of changed files</A> versus the
24Jan20 version.
</P>
<HR>
<P><B>24 Jan 2020</B>
</P>
<P>Fixed a bug with grid adaptation introduced by recent code changes.
Also fixed a few other small bugs.
</P>
<P>This is the <A HREF = "patches/files.24Jan20">list of changed files</A> versus the
9Jan20 version.
</P>
<HR>
<P><B>9 Jan 2020</B>
</P>
<P>Fixed a small code issue in yesterday's release that broke
compilation with the -DSPARTA_BIGBIG flag, for running huge
simulations.
</P>
<P>This is the <A HREF = "patches/files.9Jan20">list of changed files</A> versus the
8Jan20 version.
</P>
<HR>
<P><B>8 Jan 2020</B>
</P>
<P>This patch release contains 3 new features:
</P>
<UL><LI>3 new computes which tally counts of reactions at surfaces
<LI>Options for transparent surfaces, useful for talling statistics
<LI>3 new surface collision models - work by Krishnan Gopalan (NASA)
</UL>
<P>More details:
</P>
<P>a) The new computes which tally surface reactions are <A HREF = "doc/compute_react_surf.html">compute
react/surf</A>, <A HREF = "doc/compute_react_isurf_grid.html">compute
react/isurf/grid</A>, and <A HREF = "doc/compute_react_boundary.html">compute
react/boundary</A>. <A HREF = "doc/compute_react_isurf_grid.html">Compute
react/isurf/grid</A> can be used with
the <A HREF = "doc/fix_ablate.html">fix ablate</A> comand to drive surface ablation,
either by itself or in conjunction with the <A HREF = "doc/fix_ave_grid.html">fix
ave/grid</A> command.
</P>
<P>In addition, when gas reactions are defined by the
<A HREF = "doc/react.html">react</A> command, or surface reactions are defined by
the <A HREF = "doc/surf_react.html">surf_react</A> command, the counts of each
reaction that occurred during a run are now printed to the screen and
logfile at the end of the run. This is discussed
<A HREF = "doc/Section_start.html#start_7">here</A>. The surface reaction
quantities are likewise stored by the <A HREF = "doc/surf_react.html">surf_react</A>
command, so that they can be accessed by <A HREF = "doc/variable.html">variables</A>
or <A HREF = "stats_style.html">stats</A> output.
</P>
<P>b) See the <A HREF = "doc/Section_howto.html#howto_15">Section Howto 6.15</A> doc page
for a description of how to define and use transparent surfaces.
</P>
<P>c) These are the new surface collision models:
</P>
<UL><LI>cll = Cercignani, Lampis, and Lord collision model
<LI>td = thermal desorption collision model from Krishnan Gopalan
<LI>impulsive = collision model for high translational and low internal energies, e.g. a beam of particles, also from Krishnan Gopalan
</UL>
<P>Details are described on the <A HREF = "doc/surf_collide.html">surf collide</A> doc
page.
</P>
<P>This is the <A HREF = "patches/files.8Jan20">list of changed files</A> versus the
15Oct19 version.
</P>
<HR>
<P><B>15 Oct 2019</B>
</P>
<P>Added the following commands to enable ablation modeling of implicit
surfaces:
</P>
<UL><LI><A HREF = "doc/fix_ablate.html">fix ablate</A>
<LI><A HREF = "doc/compute_isurf_grid.html">compute isurf/grid</A>
<LI><A HREF = "doc/write_isurf.html">write_isurf</A>
</UL>
<P>These files may also be useful. The former contains example input
scripts and log files. The latter gives an overview of ablation
modeling with SPARTA and the relevant commands to use.
</P>
<UL><LI>examples/ablation
<LI><A HREF = "doc/Section_howto.html#howto_14">doc/Section_howto.html#howto_14</A>
</UL>
<P>Also enabled use of a variable temperature in the <A HREF = "doc/surf_collide.html">surf_collide
diffuse</A> command, to model time-dependent
surface temperatures.
</P>
<P>This is the <A HREF = "patches/files.15Oct19">list of changed files</A> versus the
9Sep19 version.
</P>
<HR>
<P><B>9 Sep 2019</B>
</P>
<P>Extended the <A HREF = "doc/read_surf.html">read_surf</A>,
<A HREF = "doc/write_surf.html">write_surf</A>, and <A HREF = "doc/read_isurf.html">read_isurf</A>
commands to work with explicit, distributed, and implicit surfaces.
For simulations with large counts of explicit surfaces, multiple files
can be used so that the reading and writing can be done in parallel
from many processors. The explicit surface data file now has 2
formats, with and without a Points section. If the section is not
included, individual point coords are listed with the line and surface
elements. Lines and Triangles now have a unique ID. The lines and
triangles do not need to be listed in order in the file(s), which will
typically be the case in a file written when surface elements are
distributed.
</P>
<P>See the <A HREF = "doc/write_surf.html">write_surf</A> and
<A HREF = "doc/read_surf.html">read_surf</A> commands for details. Also added
support for the clip operation in the <A HREF = "doc/read_surf.html">read_surf</A>
command for distributed surfaces.
</P>
<P>Fixed a bug with the <A HREF = "doc/dump_image.html">dump image ssao</A> command
which was reading the dfactor parameter incorrectly.
</P>
<P>This is the <A HREF = "patches/files.9Sep19">list of changed files</A> versus the
16Apr19 version.
</P>
<HR>
<P><B>16 Apr 2019</B>
</P>
<P>Arnaud Borner (NASA Ames) added a marching cubes algorithm to enable
3d implicit surfaces (triangles) to be used in a simualation model.
</P>
<P>See these doc pages and example scripts for more info
on using 3d implicit surfaces in a simulation:
</P>
<UL><LI><A HREF = "doc/Section_howto.html#howto_13">Section howto 6.13</A>
<LI><A HREF = "doc/read_isurf.html">read_isurf</A> command
<LI><A HREF = "doc/Section_tools.html#implicit">tools/implicit_grid.py</A>
<LI>examples/implicit/in.implicit.3d.*
</UL>
<P>This is the <A HREF = "patches/files.16Apr19">list of changed files</A> versus the
15Apr19 version.
</P>
<HR>
<P><B>15 Apr 2019</B>
</P>
<P>Some bug fixes in the collision model (non hard-sphere case) and for
recombination reactions and the TCE reaction model. These were either
corner cases or small effects. Thanks to Israel Sebastiao (Purdue U),
Arnaud Borner (NASA Ames Research Center), and @j-d-fuhr (GitHub).
</P>
<P>Added rendezvous method for summing surface tallies for output.
Should be much faster for large surface element counts or large
processor counts.
</P>
<P>Various Kokkos optimizations.
</P>
<P>Low-memory version of reading/writing restart files via the <A HREF = "doc/global.html">global
mem/limit</A> command.
</P>
<P>Added some more statistics (mean, min, max, variance) to timing output
at the end of runs.
</P>
<P>This is the <A HREF = "patches/files.15Apr19">list of changed files</A> versus the
15Feb19 version.
</P>
<HR>
<P><B>15 Feb 2019</B>
</P>
<P>Added support for distributed surface elements and for implicit 2d
surfaces defined by grid cell corner point values. This means there
are 3 flavors of surfaces now supported: non-distributed explicit (as
before, the default), distributed explicit (new), and implict (new,
which are also distributed). The explicit distributed surfaces are
useful to save memory when huge numbers of surface elements are
defined. Implicit surfaces are useful for modeling porous materials
where the structure of the material may be determined by experimental
images.
</P>
<P>These are the doc pages, new or altered commands, tools, and examples
that were added to support these new features:
</P>
<UL><LI><A HREF = "doc/Section_howto.html#howto_13">Section howto 6.13</A>
<LI><A HREF = "doc/global.html">global surfs</A> command
<LI><A HREF = "doc/read_isurf.html">read_isurf</A> command
<LI><A HREF = "doc/Section_tools.html#jagged">tools/jagged2d.py</A>
<LI><A HREF = "doc/Section_tools.html#jagged">tools/jagged3d.py</A>
<LI><A HREF = "doc/Section_tools.html#implicit">tools/implicit_grid.py</A>
<LI>examples/jagged
<LI>examples/implicit
<LI>examples/circle/in.circle.distributed
<LI>examples/sphere/in.sphere.distributed
</UL>
<P>Note that not all commands related to surface processing are supported
by the new explcit or implicit surface options. However tests are
made and error messages should be printed when a not-yet-supported
commmand is used. See the discussion in <A HREF = "doc/Section_howto.html#howto_13">Section howto
6.13</A> for more details.
</P>
<P>This is the <A HREF = "patches/files.15Feb19">list of changed files</A> versus the
4Jan19 version.
</P>
<HR>
<P><B>4 Jan 2019</B>
</P>
<P>Added a new algorithm for mapping surface elements to grid cells. The
original algorithm can still be selected via the <A HREF = "doc/global.html">global
surfgrid</A> command. The <A HREF = "doc/global.html">global
cellmax</A> and <A HREF = "doc/global.html">global splitmax</A>
settings were also added.
</P>
<P>The new algorithm is the default for systems with large surface
element counts. It should be faster and more scalable than the
previous algorithm when the count of surface elements or processors is
large.
</P>
<P>An overflow bug when using extremely large grids was fixed.
</P>
<P>A new version of the KOKKOS is included in this patch release.
</P>
<P>This is the <A HREF = "patches/files.4Jan19">list of changed files</A> versus the
13Nov18 version.
</P>
<HR>
<P><B>13 Nov 2018</B>
</P>
<P>Made some internal changes to the surface element data structures.
Should not change the behavior of the code for users, but
it touches a lot of files.
</P>
<P>This is the <A HREF = "patches/files.13Nov18">list of changed files</A> versus the
29Oct18 version.
</P>
<HR>
<P><B>29 Oct 2018</B>
</P>
<P>Stan Moore and Alan Stagg (Sandia): Added a <A HREF = "doc/global.html">global
mem/limit</A> option to limit the memory allocated and
used when load-balancing or reordering particles. For very large
simulations which are memory bound this can enable the simulation to
run when one of these operations would otherwise run out of available
memory and generate an error. See <A HREF = "https://github.com/sparta/sparta/pull/12">PR
#12</A>.
</P>
<P>This is the <A HREF = "patches/files.29Oct18">list of changed files</A> versus the
24Oct18 version.
</P>
<HR>
<P><B>24 Oct 2018</B>
</P>
<P>Fixed a bug in the <A HREF = "doc/compute_tvib_grid.html">compute tvib/grid</A>
command when calculating vibrational temperatures of groups with
multiple species. See <A HREF = "https://github.com/sparta/sparta/pull/15">PR
#15</A>.
</P>
<P>This is the <A HREF = "patches/files.24Oct18">list of changed files</A> versus the
5Sep18 version.
</P>
<HR>
<P><B>5 Sep 2018</B>
</P>
<P>Stan Moore, Alan Stagg, and Tim Fuller (Sandia): Additions to KOKKOS
package to support TCE reactions, histogramming fixes, and several
computes. See <A HREF = "https://github.com/sparta/sparta/pull/11">PR #11</A>.
</P>
<P>Zhi-Hui Wang (University of Chinese Academy of Sciences (UCAS)) and
Israel Borges Sebastiao (Purdue University): Enhanced collision models
to use of omega averaged over the 2 species involved in a collision.
See <A HREF = "https://github.com/sparta/sparta/pull/10">PR #10</A>.
</P>
<P>Small bug fix for ambipolar reactions.
</P>
<P>This is the <A HREF = "patches/files.5Sep18">list of changed files</A> versus the
22Jun18 version.
</P>
<HR>
<P><B>22 Jun 2018</B>
</P>
<P>Added discrete vibrational energy modes to the collision and reaction
models. An optional species files with vibrational mode info on
polyatomic molecular species with 4,6,8 vibrational degrees of freedom
can be input. An overview of how to use this feature is give in
<A HREF = "doc/Section_howto.html#howto_12">Section 6.12</A> of the manual.
</P>
<P>See these commands for more details:
</P>
<UL><LI><A HREF = "doc/collide_modify.html">collide_modify vibrate no/smooth/discrete</A>
<LI><A HREF = "doc/species.html">species file ID1 ID2 ... vibfile vfile</A>
<LI><A HREF = "doc/fix_vibmode.html">fix vibmode</A>
</UL>
<P>There is an examples/vibrate directory with an example input
script that uses these options.
</P>
<P>This is the <A HREF = "patches/files.22Jun18">list of changed files</A> versus the
4Apr17 version.
</P>
<HR>
<P><B>4 Apr 2018</B>
</P>
<P>Stan Moore (Sandia) added an option to use per-processor CPU time as a
balancing metric to the <A HREF = "doc/balance_grid.html">balance_grid</A> and
<A HREF = "doc/fix_balance.html">fix_balance</A> commands.
</P>
<P>He also enabled the <A HREF = "doc/compute_boundary.html">compute boundary</A> and
<A HREF = "doc/surf_collide.html">surf_collide</A> commands to work with Kokkos.
</P>
<P>This version also includes a new version of the Kokkos library
included with SPARTA.
</P>
<P>This is the <A HREF = "patches/files.4Apr18">list of changed files</A> versus the
23Dec17 version.
</P>
<HR>
<P><B>23 Dec 2017</B>
</P>
<P>One more time ... must have drunk too much Christmas eggnog.
</P>
<P>This is the <A HREF = "patches/files.23Dec17">list of changed files</A> versus the
22Dec17 version.
</P>
<HR>
<P><B>22 Dec 2017</B>
</P>
<P>We forgot to include the Kokkos library itself in the SPARTA
disribution in the the 21 Dec 2017 version! This version has it.
See lib/README and lib/kokkos once you unpack the tarball.
</P>
<P>This is the <A HREF = "patches/files.22Dec17">list of changed files</A> versus the
21Dec17 version.
</P>
<HR>
<P><B>21 Dec 2017</B>
</P>
<P>Stan Moore, Dan Ibanez, and Tim Fuller (Sandia) have done heroic work
to enable SPARTA to work with the open-source <A HREF = "https://github.com/kokkos/kokkos">Kokkos
library</A>. This is implemented as a
new KOKKOS package in the code. For an application code like SPARTA,
Kokkos is designed to enable one set of source-code modifications to
run reasonably efficient on a variety of hardware, e.g. multi-core
CPU, GPU, and KNL nodes. See these sections of the manual for more
details:
</P>
<UL><LI><A HREF = "doc/Section_packages.html">Section packages</A>
<LI><A HREF = "doc/Section_accelerate.html">Section accelerate</A>
<LI><A HREF = "doc/accelerate_kokkos.html">KOKKOS package</A>
<LI><A HREF = "doc/suffix.html">suffix</A> command
<LI><A HREF = "doc/package.html">package</A> command
</UL>
<P>Note that only some styles and options within the code are
Kokkos-enabled at this point. This includes the basic move and
collide operations, including for geometries with hierarchical grids
and embedded surfaces. This <A HREF = "doc/Section_commands.html#cmd_5">Section
3.5</A> has (k) flags listed for fixes
and computes that have been adapated for Kokkos.
</P>
<P>We also plan to soon post some benchmark numbers on the SPARTA web
page to indicate what kind of performance is possible on different
node architectures (CPU, GPU, KNL) via Kokkos.
</P>
<P>The timing output produced at the end of a run was enhanced to include
info about fixes that operate during the timestepping. Depending on
the input script, some of these can invoke expensive operations
including compute commmands. This category of operation is now listed
as a "Modify" timing in the breakdown of the timestep.
</P>
<P>This is the <A HREF = "patches/files.21Dec17">list of changed files</A> versus the
27Jul17 version.
</P>
<HR>
<P><B>27 Jul 2017</B>
</P>
<P>Eric Emdee (PPPL) called attention to an incorrect use of uniform
versus Gaussian random numbers in the particle emission models from
the simulation box face or surfaces. This makes a small (~3%)
difference in the distribution of emitted particle velocities. The
following commands are affected:
</P>
<UL><LI><A HREF = "doc/fix_emit_face.html">fix emit/face</A>
<LI><A HREF = "doc/fix_emit_face_file.html">fix emit/face/file</A>
<LI><A HREF = "doc/fix_emit_surf.html">fix emit/surf</A>
<LI><A HREF = "doc/surf_collide.html">surf_collide diffuse</A>
</UL>
<P>This is the <A HREF = "patches/files.27Jul17">list of changed files</A> versus the
4 May 2017 version.
</P>
<HR>
<P><B>4 May 2017</B>
</P>
<P>Fixed a bug with the new <A HREF = "doc/surf_collide.html">surf_collide piston</A>
command which was not tallying properties correctly on the simulation
box boundary when particles were deleted. Also added a couple new
keywords to the <A HREF = "doc/compute_boundary.html">compute boundary</A> command
and made it's tallying similar to the <A HREF = "doc/compute_surf.html">compute
surf</A> command, by using weighted particle counts
for many of the keywords.