v3.1.0

Summary

This release features two significant changes:

• A refactored CI infrastructure, designed by Louis Henry (@lohenry-escience). See #170.
• A port using hipfort and the diezDecomp library that enables runs on Cray-AMD supercomputers such as LUMI. The diezDecomp library and the remainder "LUMI porting" using HIP were a great effort undertaken in full by Rafael Diez (@Rafael10Diez). See #175.

Thank you for these contributions! Additionally, several minor changes related to performance, consistency, and style have been implemented.

What's Changed

• Fixed bug for z-pencils with z-implicit diffusion on CPUs. by @p-costa in #150
• Issue:147 Replace non-standard sentinel with CPP Macro by @lekzzA in #149
• Fixed syntax errors in namelist. by @p-costa in #154
• Revert "Fixed syntax errors in namelist." by @p-costa in #155
• Enable error reporting for errors in namelists. by @p-costa in #153
• *clean targets do not need dependencies file. by @p-costa in #152
• Implemented simulation an arbritrary number of scalars. by @p-costa in #144
• Parallel Cyclic Reduction - TDMA mode in the Poisson solver. by @p-costa in #160
• Remove most CPP macros in favour of command-line arguments. by @p-costa in #161
• Convert Fortran vector operations to loops. by @p-costa in #163
• Write one checkpoint file per scalar field. by @p-costa in #162
• Temporal boundary layer examples with implicit Z diffusion and Z aligned pencils. by @p-costa in #178
• Correct boundary conditions for turbulent half channel example input file. by @p-costa in #180
• Skip minor tests in the remote CI. by @p-costa in #181
• Use dependabot for updating cuDecomp submodule. by @p-costa in #182
• Typo fix in subroutine name. by @p-costa in #183
• Include diezDecomp source as a GitHub submodule. by @p-costa in #184
• Fix bug in wall-normal momentum flux term with implicit diffusion. by @p-costa in #185

Full Changelog: v2.4.0...v3.1.0

v3.0.0

CaNS 3.0 is out! 🚀

This major release features significant new features and improvements. Most notably:

• CaNS can now solve the transport equation for an arbitrary number of scalars with versatile description of diffusion terms, thanks to Baptiste Hardy @bahardy (#144). This implementation also simplified the boilerplate code to set up the Poisson/Helmholtz equations in CaNS.
• A Parallel Cyclic Reduction -- TDMA (PCR-TDMA) mode for the Poisson/Helmholtz solver has been implemented, along with other Poisson solver improvements, thanks to Rafael Diez @Rafael10Diez. This resulted in significant speed-ups in many-GPU simulations at scale (#160).
• Most CPP macros have been removed in favor of command line arguments (#161). This makes it very easy to change domain decomposition and discretization modes without re-compiling the source.
• Many general improvements and extensions, including simplifications to the build workflow, usage of new features of the cuDecomp library, and writing a single file per scalar field for checkpointing.

What's Changed

• Fixed bug for z-pencils with z-implicit diffusion on CPUs. by @p-costa in #150
• Issue:147 Replace non-standard sentinel with CPP Macro by @lekzzA in #149
• Fixed syntax errors in namelist. by @p-costa in #154
• *clean targets do not need dependencies file. by @p-costa in #152
• Implemented simulation an arbritrary number of scalars. by @p-costa in #144
• Parallel Cyclic Reduction - TDMA mode in the Poisson solver. by @p-costa in #160
• Remove most CPP macros in favour of command-line arguments. by @p-costa in #161
• Convert Fortran vector operations to loops. by @p-costa in #163
• Write one checkpoint file per scalar field. by @p-costa in #162
• Tidying up for CaNS 3.0. by @p-costa in #165

New Contributors

• @bahardy
• @Rafael10Diez
• @soaringxmc
• @lekzzA
• @gianlupo
• @v1kko
• @lohenry-escience

Full Changelog: v2.4.0...v3.0.0

v2.4.0

Summary

Among some improvements and bugfixes, these release features some significant changes:

• Implicit Z diffusion runs will perform very efficiently for XZ or YZ slab decompositions (#136, #148)
• Possibility to prescribe a fixed time step in the input file (#139)
• Build approach changed slightly to avoid tracking files with git that are supposed to be edited (#138)
• One can set iout?d to 0 in the input file for no output (#128)
• Default Intel compiler changed from ifort to ifx (#146)

What's Changed

• Updated cuDecomp submodule. by @p-costa in #118
• Updated GH actions CI version. by @p-costa in #119
• 3D Antuono vortex initial field. by @gianlupo in #123
• Fixes possible race condition. by @p-costa in #124
• Allow setting iout?d to 0 for no output. by @soaringxmc in #128
• Remove masking of output of coarsened field. by @p-costa in #130
• Fixed issue in .xmf file geneartor. by @p-costa in #131
• Reorder initial conditions for consistency. by @p-costa in #134
• Updated cuDecomp submodule. by @p-costa in #143
• Use ifx with FCOMP=INTEL. by @p-costa in #146
• Discern top and bottom boundaries in wall shear stress calculation. by @p-costa in #142
• Added option to prescribe constant time step size. by @p-costa in #139
• Account for special case of non-decompozed z directions. by @p-costa in #136
• Compile to build/ directory and do not track config files. by @p-costa in #138
• Fixed bug for z-pencils with z-implicit diffusion on CPUs. by @p-costa in #148

Full Changelog: v2.3.4...v2.4.0

v2.3.4

What's Changed

• Add option of task-local checkpointing. by @p-costa in #110
• Updated cuDecomp submodule. by @p-costa in #117

Full Changelog: v2.3.2...v2.3.4

v2.3.2

What's Changed

• Added neater format specifiers. by @p-costa in #101
• Simplify grid binary file I/O. by @p-costa in #102
• Fixed bug when changed the writting of the grid binary file. by @p-costa in #103
• Fix duct output. by @p-costa in #104
• Fix count in MPI_Allreduce statement. by @p-costa in #105
• Add noise to tbl case by default. by @p-costa in #106

Full Changelog: v2.3.1...v2.3.2

v2.3.1

What's Changed

• Fixed subroutine call in the scalar transport equation. by @p-costa in #92
• Improved support for ifx compiler. by @p-costa in #93
• Bump 2decomp submodule. by @p-costa in #94
• Added some extra descriptions. by @p-costa in #95
• Fix issue with namelist files. by @p-costa in #98

Full Changelog: v2.3.0...v2.3.1

v2.3.0

Summary

This release features a few changes, some that break backward compatibility, more specifically:

• We have changed the input file format, which is now based on Fortran namelists, see docs/INFO_INPUT.md for more details.

• We also introduced a gtype input parameter that sets the choice of grid mapping function (rather than being tied to the choice of the initial condition).

• Added more I/O flexibility (including an HDF5 backend).

What's Changed

• added more initial conditions to initgrid. by @p-costa in #76
• bump cudecomp submodule by @p-costa in #78
• fixed initialization of matlab field array by @p-costa in #79
• simplified OMP directives by @p-costa in #81
• fixed normalization of iop initial condition by @p-costa in #82
• minor change for consistency by @p-costa in #84
• Allow for a non-default grid binary file. by @p-costa in #88
• implemented and validated prescription of zero net acceleration by @p-costa in #67
• hdf5 I/O backend by @p-costa in #87
• Bump cudecomp submodule. by @p-costa in #89
• Fixed OOB issue in out1d when averaging along x or y. by @p-costa in #90
• More logical setup of the grid clustering by @p-costa in #85
• Namelist for input files by @p-costa in #86

Full Changelog: v2.2.2...v2.3.0

v2.2.2

Summary

This release features minor extensions that are not exercised at this moment, and a few minor bug fixes.

What's Changed

• added option for computing mean scalar fluxes by @p-costa in #62
• fix computation of retau for pdc case by @p-costa in #64
• Properly rescale initial velocity for iop case. by @p-costa in #65
• Extend integration of wall shear stresses to the different options. by @p-costa in #66
• temporary fix for field data I/O (for visualization, not checkpointing) on GPUs. by @p-costa in #68

Full Changelog: v2.2.1...v2.2.2

v2.2.1

Summary

This release fixes some two minor bugs, notably that the default dns.in file under src/ was not updated following the change in the input file format introduced in #54, which has now been fixed in #60.

What's Changed

• update description of dims by @p-costa in #58
• fixes potential OOB error when only one field is written by @p-costa in #59
• missed updating src/dns.in after changing input file by @p-costa in #60

Full Changelog: v2.2.0...v2.2.1

v2.2.0

Summary

This release features a change in the input file dns.in, which was simplified to avoid a common source of confusion. Instead of prescribing uref, lref, and rey (reference velocity and length scales, and Reynolds number) to calculate the fluid viscosity as visc = uref*lref/rey, we directly prescribe the inverse of the viscosity, visci (visc = visci**(-1)), so all inputs are dimensional (see the updated docs/INFO_INPUT.md file). Note that visci has the same value as the flow Reynolds number for all files under examples, as uref and lref were always equal to 1. This change is backwards-incompatible - former input files should be updated from v2.2.0 onward!

In addition, this release features a minor bugfix, extensions and polishing as detailed below.

What's Changed

• updated GPU implementation of a single scalar by @p-costa in #48
• Add symlink by @p-costa in #49
• polishing python readers by @p-costa in #50
• explicitly import functions from the cudafor module, not implicitly… by @p-costa in #51
• added support for Intel ifx by @p-costa in #53
• fixes bug in the GPU signal processing routines by @p-costa in #56
• changed input files to take visci, the inverse viscosity by @p-costa in #54
• explicitly add optional switch for asynchronous halo exchange on CPUs by @p-costa in #57

Full Changelog: v2.1.1...v2.2.0